{"id":2528,"date":"2026-07-19T23:43:21","date_gmt":"2026-07-19T23:43:21","guid":{"rendered":"https:\/\/www.fhysilicone.com\/?p=2528"},"modified":"2026-07-19T23:44:49","modified_gmt":"2026-07-19T23:44:49","slug":"how-to-choose-the-right-lsr-grade-for-medical-automotive-and-consumer-products","status":"publish","type":"post","link":"https:\/\/www.fhysilicone.com\/de\/how-to-choose-the-right-lsr-grade-for-medical-automotive-and-consumer-products\/","title":{"rendered":"So w\u00e4hlen Sie die richtige LSR-Sorte f\u00fcr Medizin-, Automobil- und Konsumg\u00fcter aus"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Fl\u00fcssigsilikonkautschuk ist in vielen verschiedenen Formulierungen erh\u00e4ltlich, die zwar \u00e4hnlich erscheinen m\u00f6gen, sich jedoch in der Produktion und bei der Endanwendung sehr unterschiedlich verhalten.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zwei LSR-Typen mit derselben Shore-A-H\u00e4rte k\u00f6nnen sich in folgenden Punkten unterscheiden:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rei\u00dffestigkeit<\/li>\n\n\n\n<li>Dehnung<\/li>\n\n\n\n<li>Druckverformungsrest<\/li>\n\n\n\n<li>Transparenz<\/li>\n\n\n\n<li>Selbstschmierung<\/li>\n\n\n\n<li>W\u00e4rmebest\u00e4ndigkeit<\/li>\n\n\n\n<li>Chemikalienbest\u00e4ndigkeit<\/li>\n\n\n\n<li>Haftung auf Kunststoffen oder Metallen<\/li>\n\n\n\n<li>Unterlagen zur biologischen Unterst\u00fctzung<\/li>\n\n\n\n<li>Status hinsichtlich des Kontakts mit Lebensmitteln<\/li>\n\n\n\n<li>Aush\u00e4rtungsgeschwindigkeit und Formverhalten<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Aus diesem Grund sollte die Auswahl einer LSR-Sorte niemals ausschlie\u00dflich auf der Grundlage von H\u00e4rte, Farbe oder Preis erfolgen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Das geeignete Material muss drei Gruppen von Anforderungen erf\u00fcllen:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Produktleistung:<\/strong> Wie muss sich das fertige Bauteil verhalten?<\/li>\n\n\n\n<li><strong>Einhaltung von Anwendungsvorschriften:<\/strong> Welche Anforderungen gelten in Bezug auf Kontakt, Sicherheit und Dokumentation?<\/li>\n\n\n\n<li><strong>Kompatibilit\u00e4t bei der Fertigung:<\/strong> L\u00e4sst sich der Werkstoff im Rahmen des vorgesehenen Fertigungsprozesses konsistent in der gew\u00fcnschten Geometrie formen?<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">LSR wird in der Regel als Zweikomponentenmaterial geliefert, das w\u00e4hrend des Spritzgussprozesses dosiert, gemischt und schnell thermisch ausgeh\u00e4rtet wird. Dank seiner Verarbeitungseigenschaften eignet es sich f\u00fcr die automatisierte Fertigung, d\u00fcnne Wandst\u00e4rken, komplexe Geometrien und die Serienfertigung. Kommerzielle LSR-Produktportfolios decken Anwendungen in den Bereichen Automobil, Gesundheitswesen, Elektrotechnik, Lebensmittelkontakt sowie allgemeine Konsumg\u00fcter ab.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In diesem Leitfaden wird erl\u00e4utert, wie man einen geeigneten LSR-Typ f\u00fcr Medizinprodukte, Automobilprodukte und Konsumg\u00fcter ausw\u00e4hlt.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-1024x768.png\" alt=\"\" class=\"wp-image-2529\" srcset=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-1024x768.png 1024w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-300x225.png 300w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-768x576.png 768w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-16x12.png 16w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-600x450.png 600w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products.png 1448w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Beginnen Sie mit der Anwendung, nicht mit dem Materialdatenblatt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ein Werkstoffdatenblatt ist erst dann von Nutzen, wenn die Anwendungsanforderungen definiert wurden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bevor Sie die LSR-Qualit\u00e4tsstufen vergleichen, halten Sie Folgendes fest:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vorgesehene Produktfunktion<\/li>\n\n\n\n<li>Art des Benutzerkontakts<\/li>\n\n\n\n<li>Kontaktdauer<\/li>\n\n\n\n<li>Betriebstemperaturbereich<\/li>\n\n\n\n<li>Kontakt mit Wasser, \u00d6len, Kraftstoffen oder Reinigungsmitteln<\/li>\n\n\n\n<li>Erforderliche Flexibilit\u00e4t<\/li>\n\n\n\n<li>Erforderlicher Dichtungsdruck<\/li>\n\n\n\n<li>Erwartete Lebensdauer des Produkts<\/li>\n\n\n\n<li>Anzahl der Kompressions- oder Bet\u00e4tigungszyklen<\/li>\n\n\n\n<li>Sterilisations- oder Reinigungsverfahren<\/li>\n\n\n\n<li>Anforderungen an Transparenz und Farbe<\/li>\n\n\n\n<li>Kunststoff-, Metall- oder Kabeleins\u00e4tze<\/li>\n\n\n\n<li>Produktionsvolumen<\/li>\n\n\n\n<li>Zielmarkt<\/li>\n\n\n\n<li>Erforderliche Compliance-Unterlagen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ein medizinisches Ventil, eine Dichtung f\u00fcr Automobilsteckverbinder und ein Trinkzubeh\u00f6r f\u00fcr Endverbraucher k\u00f6nnen zwar alle im LSR-Spritzgussverfahren hergestellt werden, sollten jedoch nicht automatisch dieselbe Rezeptur verwenden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Die gew\u00e4hlte G\u00fcteklasse muss dem tats\u00e4chlichen Risiko- und Leistungsprofil des Bauteils entsprechen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Die wichtigsten Auswahlkriterien f\u00fcr LSR verstehen<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Shore-A-H\u00e4rte<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Die H\u00e4rte beeinflusst, wie leicht sich ein LSR-Bauteil unter Druck verformt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weichere Sorten k\u00f6nnen Folgendes bieten:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geringere Druckkraft<\/li>\n\n\n\n<li>Bessere Anpassung an unebene Oberfl\u00e4chen<\/li>\n\n\n\n<li>Bessere D\u00e4mpfung<\/li>\n\n\n\n<li>Eine weiche Haptik<\/li>\n\n\n\n<li>Leichtere Verformung bei Ventilen und Membranen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Allerdings k\u00f6nnen auch sehr weiche Materialien folgende Eigenschaften aufweisen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geringere Dimensionsstabilit\u00e4t<\/li>\n\n\n\n<li>Erh\u00f6htes Risiko des Abrollens der Dichtung<\/li>\n\n\n\n<li>Kompliziertere automatisierte Handhabung<\/li>\n\n\n\n<li>Erh\u00f6hte Staubanziehung<\/li>\n\n\n\n<li>St\u00e4rkere Verformung beim Entformen<\/li>\n\n\n\n<li>Geringerer Extrusionswiderstand<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Schwierigere Stufen k\u00f6nnen Folgendes bieten:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stabilere Abmessungen<\/li>\n\n\n\n<li>Einfachere Handhabung<\/li>\n\n\n\n<li>Verbesserte Unterst\u00fctzung f\u00fcr schmale Elemente<\/li>\n\n\n\n<li>H\u00f6here Verschiebungsfestigkeit<\/li>\n\n\n\n<li>Ein deutlich sp\u00fcrbares Feedback<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00f6glicherweise erfordern sie auch eine h\u00f6here Montage- oder Bet\u00e4tigungskraft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Die H\u00e4rte sollte daher unter Ber\u00fccksichtigung der Wandst\u00e4rke, der Dichtungsgeometrie und der zu erwartenden Druckbelastung ausgew\u00e4hlt werden.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Zugfestigkeit und Dehnung<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Die Zugfestigkeit gibt an, wie viel Zugspannung das ausgeh\u00e4rtete Material aushalten kann, w\u00e4hrend die Dehnung beschreibt, wie weit es sich vor dem Bruch dehnen l\u00e4sst.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diese Eigenschaften sind wichtig f\u00fcr:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00fcnne Membranen<\/li>\n\n\n\n<li>Dehnbare Komponenten<\/li>\n\n\n\n<li>Trageb\u00e4nder<\/li>\n\n\n\n<li>Ventilelemente<\/li>\n\n\n\n<li>Entformen von Teilen mit Hinterschneidungen<\/li>\n\n\n\n<li>Produkte, die wiederholt gebogen wurden<\/li>\n\n\n\n<li>Auf starren Elementen montierte Bauteile<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Eine hohe Dehnung ist zwar von Vorteil, sollte jedoch nicht als einziges Kriterium herangezogen werden. Ein Material mit hoher Dehnbarkeit kann an einer scharfen Kante oder einer geformten Kerbe dennoch leicht rei\u00dfen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Rei\u00dffestigkeit<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tear strength is particularly important when a component includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00fcnne Dichtlippen<\/li>\n\n\n\n<li>Slits<\/li>\n\n\n\n<li>Stellenangebote<\/li>\n\n\n\n<li>Snap-over assembly features<\/li>\n\n\n\n<li>Narrow wall sections<\/li>\n\n\n\n<li>Tiefe Hinterschneidungen<\/li>\n\n\n\n<li>Repeated bending points<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">LSR parts often fail from a small cut or edge defect rather than uniform tensile loading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A product that must be stretched during installation should be designed with rounded transitions and sufficient tear resistance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Druckverformungsrest<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Compression set measures how much permanent deformation remains after an elastomer has been compressed for a defined time and temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is especially important for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dichtungen f\u00fcr Steckverbinder in der Automobilindustrie<\/li>\n\n\n\n<li>Randdichtungen<\/li>\n\n\n\n<li>Medizinische Dichtungen<\/li>\n\n\n\n<li>Long-term housing seals<\/li>\n\n\n\n<li>O-Ringe<\/li>\n\n\n\n<li>Kabelverschraubungen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Low compression set helps a seal retain contact pressure during prolonged use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive-specific LSR grades may be formulated for low compression set, self-lubrication and resistance to thermal aging. For example, published supplier portfolios identify specialized materials for cable seals, mat seals, grommets and connector gaskets rather than treating general-purpose LSR as interchangeable with automotive sealing grades.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Modul<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modulus describes the resistance of the material to deformation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two grades with the same Shore hardness may have different force-deflection behavior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modulus affects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valve-opening pressure<\/li>\n\n\n\n<li>Button-actuation force<\/li>\n\n\n\n<li>Seal compression<\/li>\n\n\n\n<li>Diaphragm movement<\/li>\n\n\n\n<li>Assembly force<\/li>\n\n\n\n<li>Haptik des Produkts<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For functional parts, force testing on the actual geometry is often more useful than relying only on Shore hardness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Transparenz<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Optically clear or translucent LSR may be required for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Medical fluid-path components<\/li>\n\n\n\n<li>Diagnostic products<\/li>\n\n\n\n<li>Babyartikel<\/li>\n\n\n\n<li>Lighting parts<\/li>\n\n\n\n<li>Optical interfaces<\/li>\n\n\n\n<li>Consumer products where cleanliness must be visible<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Transparency can be influenced by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Materialzusammensetzung<\/li>\n\n\n\n<li>Pigmente<\/li>\n\n\n\n<li>Oberfl\u00e4chenbeschaffenheit der Form<\/li>\n\n\n\n<li>Wandst\u00e4rke<\/li>\n\n\n\n<li>Aush\u00e4rtungsbedingungen<\/li>\n\n\n\n<li>Nachh\u00e4rtung<\/li>\n\n\n\n<li>Verunreinigung<\/li>\n\n\n\n<li>Sterilization or aging<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A \u201cclear\u201d grade should be evaluated using the intended part thickness and surface finish.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Viskosit\u00e4t und Flie\u00dfverhalten<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Material viscosity affects mold filling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lower-viscosity LSR may be advantageous for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thin walls<\/li>\n\n\n\n<li>Long flow paths<\/li>\n\n\n\n<li>Small sealing ribs<\/li>\n\n\n\n<li>Microfeatures<\/li>\n\n\n\n<li>Mehrfachformen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, highly fluid LSR can also increase the risk of flash at parting lines and around inserts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct grade must be matched with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gate size<\/li>\n\n\n\n<li>Runner system<\/li>\n\n\n\n<li>Anordnung der Kavit\u00e4ten<\/li>\n\n\n\n<li>Entl\u00fcftung<\/li>\n\n\n\n<li>Einspritzdruck<\/li>\n\n\n\n<li>Mold shutoff accuracy<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Cure Speed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fast-curing grades can shorten cycle time and improve production efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, very rapid curing may reduce the available filling time for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gro\u00dfe Bauteile<\/li>\n\n\n\n<li>Long flow paths<\/li>\n\n\n\n<li>Multi-material parts<\/li>\n\n\n\n<li>Complex insert-molding projects<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A material that cures quickly in a simple test mold may behave differently in a large production tool.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Post-Curing Requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Some applications or material grades may require post-curing to stabilize properties or reduce certain volatile residues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Post-curing can affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Abmessungen<\/li>\n\n\n\n<li>H\u00e4rte<\/li>\n\n\n\n<li>Farbe<\/li>\n\n\n\n<li>Druckverformungsrest<\/li>\n\n\n\n<li>Volatile content<\/li>\n\n\n\n<li>Production cost<\/li>\n\n\n\n<li>Delivery time<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The need for post-curing should be established before the quotation because it adds equipment, energy, handling and inspection requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Choosing LSR for Medical Components<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Medical LSR selection begins with the intended device use and the nature and duration of patient contact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FDA\u2019s biological-evaluation framework categorizes contact duration as limited, prolonged or long-term and considers the nature of body contact when identifying relevant biological endpoints. The biological suitability of silicone ultimately has to be assessed for its intended use, and data from the finished device are generally more relevant than data from uncured raw material alone.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Define the Contact Type<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Determine whether the finished product contacts:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intact skin<\/li>\n\n\n\n<li>Mucosal membranes<\/li>\n\n\n\n<li>Compromised surfaces<\/li>\n\n\n\n<li>Tissue<\/li>\n\n\n\n<li>Blood<\/li>\n\n\n\n<li>A fluid path that indirectly contacts the patient<\/li>\n\n\n\n<li>No patient-contact area<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A medical equipment handle touching intact skin is not evaluated in the same way as an implanted component or fluid-delivery valve.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Review Available Biological-Support Information<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A candidate medical LSR grade may be supported by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Biocompatibility test information<\/li>\n\n\n\n<li>Chemical-characterization information<\/li>\n\n\n\n<li>Werkstoffkennzeichnung<\/li>\n\n\n\n<li>R\u00fcckverfolgbarkeit von Chargen<\/li>\n\n\n\n<li>Processing recommendations<\/li>\n\n\n\n<li>Supplier change-control policies<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Selected commercial LSR grades are marketed for healthcare applications such as valves, IV components, sealing elements, respiratory products and other precision medical components. However, the finished-device manufacturer remains responsible for determining whether the complete product is suitable for its intended use.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The review should confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The exact grade tested<\/li>\n\n\n\n<li>Whether the same pigment was included<\/li>\n\n\n\n<li>The curing and post-curing conditions<\/li>\n\n\n\n<li>Whether testing represents the final component<\/li>\n\n\n\n<li>Ob die Daten aktuell bleiben<\/li>\n\n\n\n<li>Whether additional device-specific evaluation is required<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Evaluate Sterilization Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Medical components may be exposed to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ethylenoxid<\/li>\n\n\n\n<li>Dampf<\/li>\n\n\n\n<li>Gammastrahlung<\/li>\n\n\n\n<li>Elektronenstrahlung<\/li>\n\n\n\n<li>X-ray processing<\/li>\n\n\n\n<li>Verdampftes Wasserstoffperoxid<\/li>\n\n\n\n<li>Repeated disinfection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Sterilization can change:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Farbe<\/li>\n\n\n\n<li>Transparenz<\/li>\n\n\n\n<li>H\u00e4rte<\/li>\n\n\n\n<li>Dehnung<\/li>\n\n\n\n<li>Rei\u00dffestigkeit<\/li>\n\n\n\n<li>Druckverformungsrest<\/li>\n\n\n\n<li>Oberfl\u00e4chenbeschaffenheit<\/li>\n\n\n\n<li>Haftfestigkeit<\/li>\n\n\n\n<li>Extrahierbare Stoffe<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Testing should use the intended sterilization process and the maximum expected number of cycles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consider Cleanliness and Manufacturing Controls<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Medical products may require controls for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cross-contamination<\/li>\n\n\n\n<li>R\u00fcckverfolgbarkeit von Materialien<\/li>\n\n\n\n<li>Reinheit der Form<\/li>\n\n\n\n<li>Nachh\u00e4rtung<\/li>\n\n\n\n<li>Particle levels<\/li>\n\n\n\n<li>Handling<\/li>\n\n\n\n<li>Washing<\/li>\n\n\n\n<li>Verpackung<\/li>\n\n\n\n<li>Produktionsaufzeichnungen<\/li>\n\n\n\n<li>Wesentliche \u00c4nderungen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Not every medical-related silicone part requires the same production environment, but the factory controls should be appropriate for the identified risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Select Mechanical Properties for the Function<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Medical applications may prioritize different properties:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Medical component<\/th><th>Important LSR characteristics<\/th><\/tr><tr><td>Valve or diaphragm<\/td><td>Controlled modulus, fatigue resistance, consistent dimensions<\/td><\/tr><tr><td>Respiratory mask seal<\/td><td>Softness, tear resistance, skin comfort, low compression set<\/td><\/tr><tr><td>Connector seal<\/td><td>Dimensional stability, sealing performance, traceability<\/td><\/tr><tr><td>Umspritzung von medizinischen Kabeln<\/td><td>Adhesion, flexibility, strain relief and tear resistance<\/td><\/tr><tr><td>Transparent fluid component<\/td><td>Clarity, cleanliness and representative biological evaluation<\/td><\/tr><tr><td>Wearable skin-contact part<\/td><td>Comfort, cleaning resistance and pigmentation control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cMedical grade\u201d should not replace a detailed mechanical specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Choosing LSR for Automotive Components<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive LSR parts may be exposed to long-term heat, thermal cycling, vibration, humidity, oils, fuels and continuous compression.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu den typischen Anwendungsbereichen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Steckverbinder-Dichtungen<\/li>\n\n\n\n<li>Wire seals<\/li>\n\n\n\n<li>Mattendichtungen<\/li>\n\n\n\n<li>Randdichtungen<\/li>\n\n\n\n<li>Sensordichtungen<\/li>\n\n\n\n<li>Kabelverschraubungen<\/li>\n\n\n\n<li>Battery-system seals<\/li>\n\n\n\n<li>Plastic-and-LSR overmolded housings<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Supplier product portfolios include automotive-specific LSR grades for connector seals, radial seals, weather-pack seals, grommets and wire-harness components, including self-lubricating and low-compression-set formulations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Prioritize Heat-Aging Performance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Do not select an automotive grade using only its short-term maximum temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Request information about:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous-use temperature<\/li>\n\n\n\n<li>Heat aging<\/li>\n\n\n\n<li>Property change after aging<\/li>\n\n\n\n<li>Compression set at elevated temperature<\/li>\n\n\n\n<li>Leistung nach Temperaturwechselbeanspruchung<\/li>\n\n\n\n<li>Compatibility with adjacent thermoplastics<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A seal may remain visually intact but lose sufficient recovery force to prevent moisture ingress.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Define Fluid Exposure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Standard dimethyl LSR may be suitable for many electrical and environmental sealing applications, but it is not automatically suitable for continuous exposure to every fuel, oil or solvent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For aggressive hydrocarbon exposure, fluoro-LSR may be considered. Commercial F-LSR materials are designed to combine silicone-like temperature flexibility with improved resistance to non-polar fuels, oils and solvents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Material testing should use the actual:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fluid<\/li>\n\n\n\n<li>Konzentration<\/li>\n\n\n\n<li>Temperatur<\/li>\n\n\n\n<li>Expositionsdauer<\/li>\n\n\n\n<li>Mechanical condition<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Evaluate Self-Lubricating Grades<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive connector seals can generate high friction when wires or terminals are inserted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A self-lubricating grade may help reduce:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Einf\u00fchrkraft<\/li>\n\n\n\n<li>Seal tearing<\/li>\n\n\n\n<li>Dichtungsverschiebung<\/li>\n\n\n\n<li>Assembly variation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Published automotive grades include different internal oil levels for connector and radial-sealing applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The complete connector should still be evaluated for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lubricant migration<\/li>\n\n\n\n<li>Staubanziehung<\/li>\n\n\n\n<li>Contact contamination<\/li>\n\n\n\n<li>Long-term consistency<\/li>\n\n\n\n<li>Storage effects<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Consider Overmolding Adhesion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive components frequently combine LSR with PBT, polyamide or other engineering thermoplastics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Self-adhesive LSR can reduce the need for primer and separate assembly, but adhesion is substrate-specific. Dow describes selective-adhesion LSR grades for two-component molding with thermoplastics including PBT and polyamide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The actual production plastic should be tested because adhesion can be affected by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Glass-fiber content<\/li>\n\n\n\n<li>Pigmente<\/li>\n\n\n\n<li>Flammschutzmittel<\/li>\n\n\n\n<li>Mold-release additives<\/li>\n\n\n\n<li>Feuchtigkeit<\/li>\n\n\n\n<li>Oberfl\u00e4chenverunreinigung<\/li>\n\n\n\n<li>Temperatur eingeben<\/li>\n\n\n\n<li>Storage time<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Match Hardness to the Seal Geometry<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A softer grade may reduce insertion or compression force, while a harder grade may improve dimensional stability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The final selection should be verified through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tolerance analysis<\/li>\n\n\n\n<li>Assembly-force testing<\/li>\n\n\n\n<li>Dichtheitspr\u00fcfung<\/li>\n\n\n\n<li>Heat aging<\/li>\n\n\n\n<li>Temperaturwechselbeanspruchung<\/li>\n\n\n\n<li>Schwingungspr\u00fcfung<\/li>\n\n\n\n<li>Fluid exposure<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Choosing LSR for Consumer Products<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer LSR applications can include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zubeh\u00f6r f\u00fcr die Babynahrung<\/li>\n\n\n\n<li>K\u00fcchenzubeh\u00f6r<\/li>\n\n\n\n<li>Drinkware components<\/li>\n\n\n\n<li>Tragbare Produkte<\/li>\n\n\n\n<li>Personal-care products<\/li>\n\n\n\n<li>Sports accessories<\/li>\n\n\n\n<li>Schutzh\u00fcllen<\/li>\n\n\n\n<li>Dichtungen f\u00fcr Haushaltsger\u00e4te<\/li>\n\n\n\n<li>Buttons and keypads<\/li>\n\n\n\n<li>Household products<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">General-purpose LSR portfolios include grades designed for cooking products, gaskets, seals, sports equipment and other consumer goods.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Confirm the Contact Requirement<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer products may require different documentation depending on whether they contact:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Food<\/li>\n\n\n\n<li>Drinking water<\/li>\n\n\n\n<li>Haut<\/li>\n\n\n\n<li>A child\u2019s mouth<\/li>\n\n\n\n<li>Elektronik<\/li>\n\n\n\n<li>Household chemicals<\/li>\n\n\n\n<li>No regulated contact area<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A food-contact statement does not automatically establish suitability for a medical device. Similarly, a general consumer grade should not be presented as suitable for infant feeding without the relevant material and finished-product evaluation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Balance Softness and Durability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Soft-touch consumer products are often designed using low-hardness LSR, but excessive softness may create:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geringe Ma\u00dfhaltigkeit<\/li>\n\n\n\n<li>Difficult assembly<\/li>\n\n\n\n<li>Oberfl\u00e4chenhaftung<\/li>\n\n\n\n<li>Staubanziehung<\/li>\n\n\n\n<li>Weak thin sections<\/li>\n\n\n\n<li>Slow elastic recovery<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For teethers, valves, buttons and wearable parts, the final selection should reflect both tactile preference and functional durability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Evaluate Color and Appearance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer products frequently require customized colors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The pigment system should be reviewed for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Intended contact application<\/li>\n\n\n\n<li>Farbkonsistenz<\/li>\n\n\n\n<li>Light stability<\/li>\n\n\n\n<li>Hitzebest\u00e4ndigkeit<\/li>\n\n\n\n<li>Migration or extraction requirements<\/li>\n\n\n\n<li>Effect on transparency<\/li>\n\n\n\n<li>Effect on curing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Strong colors may require more pigment, which can change appearance and, in some formulations, processing behavior.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consider Odor and Volatile Requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Products used near food, the face or infant-care applications may require strict odor control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Odor can be influenced by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Materialzusammensetzung<\/li>\n\n\n\n<li>Aush\u00e4rten<\/li>\n\n\n\n<li>Nachh\u00e4rtung<\/li>\n\n\n\n<li>Lagerung<\/li>\n\n\n\n<li>Verpackung<\/li>\n\n\n\n<li>Reinigung<\/li>\n\n\n\n<li>Verunreinigung<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The customer should evaluate finished packaged products rather than only newly molded samples.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Choose for the Actual User Experience<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer components may be evaluated through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Grip comfort<\/li>\n\n\n\n<li>Button force<\/li>\n\n\n\n<li>Oberfl\u00e4chenstruktur<\/li>\n\n\n\n<li>Flexibilit\u00e4t<\/li>\n\n\n\n<li>Produktgewicht<\/li>\n\n\n\n<li>Ease of cleaning<\/li>\n\n\n\n<li>Stain resistance<\/li>\n\n\n\n<li>Geruch<\/li>\n\n\n\n<li>Staubanziehung<\/li>\n\n\n\n<li>Optisches Erscheinungsbild<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A technically acceptable LSR grade can still fail commercially if the finished product feels sticky, attracts dust or is difficult to clean.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Standard, Self-Lubricating, Self-Bonding and Fluoro-LSR Grades<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Different LSR families solve different problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">General-Purpose LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suitable for many basic molded products where special adhesion, fluid resistance or biological documentation is not required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu den typischen Anwendungsbereichen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Consumer goods<\/li>\n\n\n\n<li>Grommets<\/li>\n\n\n\n<li>Basic seals<\/li>\n\n\n\n<li>Sports products<\/li>\n\n\n\n<li>Household components<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Medical-Support LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Selected for healthcare components requiring controlled formulation, traceability and relevant biological-support information.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The finished medical device still requires a risk-based evaluation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Self-Lubricating LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Designed to develop a lower-friction surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu den typischen Anwendungsbereichen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Steckverbinder-Dichtungen<\/li>\n\n\n\n<li>Gleitkomponenten<\/li>\n\n\n\n<li>Medical components requiring low surface friction<\/li>\n\n\n\n<li>Automated assembly applications<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Momentive has described self-lubricating LSR formulations for healthcare applications requiring a high-slip surface.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Self-Bonding LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Designed to bond directly to selected plastic or metal substrates during molding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu den typischen Anwendungsbereichen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Plastic-LSR housings<\/li>\n\n\n\n<li>Overmolded medical connectors<\/li>\n\n\n\n<li>Dichtungen f\u00fcr Steckverbinder in der Automobilindustrie<\/li>\n\n\n\n<li>Soft-touch consumer assemblies<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Compatibility must be verified using the exact substrate.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fluoro-LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Selected where improved resistance to fuels, oils and non-polar solvents is required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It may be useful in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automotive fluid-exposure components<\/li>\n\n\n\n<li>Industriedichtungen<\/li>\n\n\n\n<li>Specialized electrical parts<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">F-LSR generally costs more than standard LSR, so it should be used where the exposure justifies the additional material cost.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Conductive LSR<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Selected for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Antistatic components<\/li>\n\n\n\n<li>EMI shielding<\/li>\n\n\n\n<li>Leitf\u00e4hige Dichtungen<\/li>\n\n\n\n<li>Steuerung des elektrischen Feldes<\/li>\n\n\n\n<li>Flexible contacts<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Electrical resistivity and test conditions must be specified separately from mechanical properties.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overmolding Requirements<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">LSR can be molded onto plastic, metal, cable or electronic inserts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before selecting an overmolding grade, define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Insert material<\/li>\n\n\n\n<li>Insert geometry<\/li>\n\n\n\n<li>Bonding requirement<\/li>\n\n\n\n<li>Mechanical interlocks<\/li>\n\n\n\n<li>Insert temperature resistance<\/li>\n\n\n\n<li>Primer or surface-treatment needs<\/li>\n\n\n\n<li>Peel and pull requirements<\/li>\n\n\n\n<li>Fluid exposure<\/li>\n\n\n\n<li>Sterilization or aging conditions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">LSR suppliers offer self-bonding grades formulated for selected thermoplastics and metals, but no grade should be assumed to adhere equally to every substrate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A reliable overmolding evaluation should use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Production-grade inserts<\/li>\n\n\n\n<li>Actual pigments and fillers<\/li>\n\n\n\n<li>Production-intent mold temperature<\/li>\n\n\n\n<li>Representative cure time<\/li>\n\n\n\n<li>Finished-part aging<\/li>\n\n\n\n<li>Pull, peel or functional testing<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Why Datasheet Values May Not Predict Finished-Part Performance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Technical data sheets are useful for comparing candidate materials, but the values are usually generated under defined laboratory conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The finished component may behave differently because of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wandst\u00e4rke<\/li>\n\n\n\n<li>Formtemperatur<\/li>\n\n\n\n<li>Aush\u00e4rtungszeit<\/li>\n\n\n\n<li>Standort des Tors<\/li>\n\n\n\n<li>Flow orientation<\/li>\n\n\n\n<li>Schwei\u00dfn\u00e4hte<\/li>\n\n\n\n<li>Nachh\u00e4rtung<\/li>\n\n\n\n<li>Pigmente<\/li>\n\n\n\n<li>Demolding strain<\/li>\n\n\n\n<li>Insert interaction<\/li>\n\n\n\n<li>Sterilisation<\/li>\n\n\n\n<li>Environmental aging<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For example, a standard compression-set specimen does not reproduce every automotive gasket geometry. A biological test performed on a supplier specimen does not automatically represent a finished colored and sterilized medical component.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use datasheet values to shortlist materials, then validate the final molded product.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions to Ask an LSR Material Supplier<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving a grade, request clear answers to the following questions:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>What is the exact grade designation?<\/li>\n\n\n\n<li>What is the recommended application?<\/li>\n\n\n\n<li>Which hardness levels are available?<\/li>\n\n\n\n<li>Ist eine Nachh\u00e4rtung erforderlich?<\/li>\n\n\n\n<li>What are the recommended molding conditions?<\/li>\n\n\n\n<li>What biological-support data are available?<\/li>\n\n\n\n<li>Is the grade suitable for the intended food-contact market?<\/li>\n\n\n\n<li>How does it perform after heat aging?<\/li>\n\n\n\n<li>What compression-set data are available?<\/li>\n\n\n\n<li>Is it self-lubricating?<\/li>\n\n\n\n<li>Is it self-bonding?<\/li>\n\n\n\n<li>Which substrates have been evaluated?<\/li>\n\n\n\n<li>Is it compatible with the intended sterilization method?<\/li>\n\n\n\n<li>Is a fluoro-LSR version available?<\/li>\n\n\n\n<li>What is the supplier\u2019s change-notification policy?<\/li>\n\n\n\n<li>What shelf life and storage conditions apply?<\/li>\n\n\n\n<li>Can the material be pigmented?<\/li>\n\n\n\n<li>Can production-lot traceability be provided?<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Questions to Ask an LSR Molding Manufacturer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The molder should also be able to explain:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Whether the selected grade can fill the proposed geometry<\/li>\n\n\n\n<li>Whether the mold requires vacuum assistance<\/li>\n\n\n\n<li>Where gates and parting lines will be located<\/li>\n\n\n\n<li>What flash limits can be maintained<\/li>\n\n\n\n<li>Whether delicate features can be demolded without tearing<\/li>\n\n\n\n<li>How inserts will be positioned<\/li>\n\n\n\n<li>Whether primer or plasma treatment is required<\/li>\n\n\n\n<li>How curing and post-curing are controlled<\/li>\n\n\n\n<li>How critical dimensions will be inspected<\/li>\n\n\n\n<li>How material and pigment batches are traced<\/li>\n\n\n\n<li>Whether pilot production can be completed<\/li>\n\n\n\n<li>Which functional tests can be supported<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A material recommendation without a design-for-manufacturing review may overlook significant tooling or production risks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Practical LSR Grade Selection Process<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Define the Product Category<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Determine whether the component is medical, automotive, food-contact, skin-contact, electrical or general consumer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Document the Service Environment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Define temperature, fluids, cleaning, sterilization, UV, humidity and expected life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Establish Mechanical Requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify hardness, compression, tensile strength, tear strength, elongation and fatigue requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Identify Special Functions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm whether the project requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Selbstschmierung<\/li>\n\n\n\n<li>Self-bonding<\/li>\n\n\n\n<li>Optical clarity<\/li>\n\n\n\n<li>Conductivity<\/li>\n\n\n\n<li>Flame resistance<\/li>\n\n\n\n<li>Fuel resistance<\/li>\n\n\n\n<li>Geringer Druckverformungsrest<\/li>\n\n\n\n<li>Medical-support documentation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Shortlist Candidate Grades<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Compare supplier data and eliminate materials that do not meet the basic application requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6: Review Moldability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evaluate viscosity, flow length, wall thickness, gates, venting, inserts and demolding.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7: Produce Representative Samples<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use the intended:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LSR-Typ<\/li>\n\n\n\n<li>Pigment<\/li>\n\n\n\n<li>Insert<\/li>\n\n\n\n<li>Aush\u00e4rtungsprozess<\/li>\n\n\n\n<li>Nachh\u00e4rtungsprozess<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8: Test the Finished Component<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Perform dimensional, mechanical, functional and contact-related evaluation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 9: Complete Environmental Validation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Test after representative heat, sterilization, fluids, humidity, compression or repeated use.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 10: Freeze the Approved Material and Process<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Control:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material manufacturer<\/li>\n\n\n\n<li>Exact grade<\/li>\n\n\n\n<li>Pigment formula<\/li>\n\n\n\n<li>Supplier<\/li>\n\n\n\n<li>Mischungsverh\u00e4ltnis<\/li>\n\n\n\n<li>Cure parameters<\/li>\n\n\n\n<li>Nachh\u00e4rtung<\/li>\n\n\n\n<li>Insert material<\/li>\n\n\n\n<li>Pr\u00fcfverfahren<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Future substitutions should be reviewed and, where necessary, revalidated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quick Comparison by Application<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Selection factor<\/td><td>Medical products<\/td><td>Automotive products<\/td><td>Konsumg\u00fcter<\/td><\/tr><tr><td>Primary concern<\/td><td>Biological risk and controlled manufacturing<\/td><td>Long-term sealing and environmental durability<\/td><td>Safety, function, appearance and user experience<\/td><\/tr><tr><td>Key documentation<\/td><td>Biological-support and traceability information<\/td><td>Heat-aging, compression and fluid-resistance data<\/td><td>Relevant food-, skin- or consumer-contact documents<\/td><\/tr><tr><td>Important mechanical properties<\/td><td>Tear strength, modulus, fatigue and cleanliness<\/td><td>Compression set, thermal stability and fluid resistance<\/td><td>Softness, durability, color and surface feel<\/td><\/tr><tr><td>Common special grades<\/td><td>Medical-support, transparent, self-lubricating or self-bonding<\/td><td>Low-compression-set, self-lubricating, self-bonding or F-LSR<\/td><td>General-purpose, food-contact, low-density or colored LSR<\/td><\/tr><tr><td>Typical validation<\/td><td>Finished-device biological and sterilization evaluation<\/td><td>Thermal cycling, leakage, vibration and fluid testing<\/td><td>Cleaning, odor, durability and user-function testing<\/td><\/tr><tr><td>Common error<\/td><td>Treating raw-material data as finished-device approval<\/td><td>Selecting by temperature or hardness alone<\/td><td>Prioritizing softness and color over durability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Common LSR Selection Mistakes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Choosing Only by Shore Hardness<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hardness does not describe tear strength, compression set, adhesion, lubrication or biological-support documentation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Using a General-Purpose Grade for Every Application<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A material suitable for a kitchen accessory may not be suitable for an automotive fuel seal or medical fluid-path component.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Treating Medical Grade as Finished-Device Approval<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The final product, processing residues, pigments, cleaning and sterilization must be considered.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Assuming Standard LSR Resists Every Automotive Fluid<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fuel, oil or solvent exposure may require fluoro-LSR or another specialized elastomer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ignoring Post-Curing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Post-curing can affect cost, dimensions, odor and product performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Selecting Self-Bonding LSR Without Testing the Substrate<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Adhesion depends on the exact plastic formulation and process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Approving Material from a Flat Test Slab<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The final component geometry may produce different tear, compression and optical performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Changing Pigments Without Review<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pigments can affect appearance, contact documentation and processing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Selecting the Cheapest Grade<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A less expensive material can create higher costs through longer cycle times, poor yields, flash, tearing or product failure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fazit<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing the correct LSR grade requires more than selecting a hardness and color.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The decision should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Produktfunktion<\/li>\n\n\n\n<li>Kontaktart<\/li>\n\n\n\n<li>Temperatur<\/li>\n\n\n\n<li>Exposition gegen\u00fcber Chemikalien<\/li>\n\n\n\n<li>Compression<\/li>\n\n\n\n<li>Tear and fatigue requirements<\/li>\n\n\n\n<li>Sterilisation<\/li>\n\n\n\n<li>Transparenz<\/li>\n\n\n\n<li>Oberfl\u00e4chenreibung<\/li>\n\n\n\n<li>Overmolding adhesion<\/li>\n\n\n\n<li>Regulatory-support information<\/li>\n\n\n\n<li>Formbarkeit<\/li>\n\n\n\n<li>Production consistency<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Medical products require a risk-based review of the complete finished device and its intended patient contact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive products typically prioritize low compression set, heat aging, fluid resistance, assembly performance and long-term sealing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consumer products require a balance of safety, tactile quality, durability, appearance, cleanliness and manufacturing cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The best LSR grade is not the material with the longest datasheet or the lowest unit price. It is the material that provides stable finished-part performance in the actual product, process and service environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Early cooperation between the product developer, material supplier, mold maker and LSR molding manufacturer can reduce material substitutions, mold modifications and validation failures before mass production begins.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">H\u00e4ufig gestellte Fragen<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Can one LSR grade be used for medical, automotive and consumer products?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A grade may technically work in more than one application, but its documentation, environmental resistance and processing properties must be evaluated for each intended use.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is a higher-hardness LSR more durable?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not necessarily. Durability also depends on tear strength, elongation, geometry, aging and loading conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is medical-grade LSR automatically biocompatible?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Supplier data may support the biological evaluation, but the finished device and its intended contact conditions must still be assessed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Which LSR is best for automotive connector seals?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Automotive connector applications often use low-compression-set and self-lubricating grades. The final choice depends on temperature, seal design, plastic compatibility and assembly force.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When should fluoro-LSR be used?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">F-LSR should be considered where improved resistance to non-polar fuels, oils or solvents is required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can food-contact LSR be used for baby products?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It may be a suitable starting material, but the final product must also satisfy the relevant market, design and finished-product requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is self-bonding LSR?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Self-bonding LSR is formulated to adhere directly to selected plastic or metal substrates during molding, potentially eliminating a separate primer or assembly process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does self-bonding LSR adhere to every plastic?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Adhesion depends on the exact resin, additives, fillers, surface condition and molding process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is post-curing always required?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The requirement depends on the material grade, intended application and performance or contact requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What information is needed for an LSR quotation?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Provide the 2D and 3D drawings, intended application, contact type, temperature, fluid exposure, hardness, color, insert material, annual quantity, compliance needs and required tests.<\/p>","protected":false},"excerpt":{"rendered":"<p>Liquid silicone rubber is available in many formulations that may appear similar but perform very differently in production and final use. Two LSR grades with the same Shore A hardness can differ in: For this reason, selecting an LSR grade should never be based only on hardness, color or price. The correct material must satisfy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[1609,1929,1952,1945,1782,1928,1947,1930,1953,1931,1939,1943,1944,1893,47,1942,1938,1927,1932,1950,1949,1419,1779,1398,1951,1892,1940,1896,1890,1541,1934,1935,1382,1936,1948,1946,1933,1906,1941,1937],"class_list":["post-2528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","tag-automotive-connector-seals","tag-automotive-grade-lsr","tag-automotive-silicone-molding","tag-baby-product-silicone","tag-biocompatible-silicone","tag-choosing-lsr","tag-conductive-lsr","tag-consumer-product-silicone","tag-consumer-silicone-products","tag-custom-lsr-molding","tag-fast-curing-lsr","tag-fluoro-lsr","tag-food-contact-lsr","tag-fuel-resistant-silicone","tag-liquid-silicone-rubber","tag-low-compression-set-lsr","tag-low-viscosity-lsr","tag-lsr-grade-selection","tag-lsr-hardness-selection","tag-lsr-manufacturer","tag-lsr-material-supplier","tag-lsr-overmolding","tag-medical-grade-lsr","tag-medical-silicone-components","tag-medical-silicone-molding","tag-oil-resistant-silicone","tag-post-curing-silicone","tag-self-bonding-lsr","tag-self-lubricating-lsr","tag-shore-a-hardness","tag-silicone-compression-set","tag-silicone-elongation","tag-silicone-material-selection","tag-silicone-modulus","tag-silicone-moldability","tag-silicone-plastic-bonding","tag-silicone-tear-strength","tag-skin-contact-silicone","tag-sterilization-resistant-silicone","tag-transparent-lsr"],"_links":{"self":[{"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/posts\/2528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/comments?post=2528"}],"version-history":[{"count":1,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/posts\/2528\/revisions"}],"predecessor-version":[{"id":2530,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/posts\/2528\/revisions\/2530"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/media\/2529"}],"wp:attachment":[{"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/media?parent=2528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/categories?post=2528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/de\/wp-json\/wp\/v2\/tags?post=2528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}