Av denna anledning b\u00f6r valet av LSR-kvalitet aldrig baseras enbart p\u00e5 h\u00e5rdhet, f\u00e4rg eller pris.<\/p>\n\n\n\n
Det r\u00e4tta materialet m\u00e5ste uppfylla tre grupper av krav:<\/p>\n\n\n\n
- \n
- Produktens prestanda:<\/strong> Hur ska den f\u00e4rdiga komponenten fungera?<\/li>\n\n\n\n
- Efterlevnad av applikationskrav:<\/strong> Vilka krav g\u00e4ller n\u00e4r det g\u00e4ller kontakt, s\u00e4kerhet och dokumentation?<\/li>\n\n\n\n
- Kompatibilitet vid tillverkning:<\/strong> Kan materialet formas p\u00e5 ett enhetligt s\u00e4tt enligt den avsedda geometrin och tillverkningsprocessen?<\/li>\n<\/ol>\n\n\n\n
LSR levereras vanligtvis som ett tv\u00e5komponentsmaterial som doseras, blandas och snabbt v\u00e4rmeh\u00e4rdas under formsprutningen. Tack vare sina bearbetningsegenskaper l\u00e4mpar det sig v\u00e4l f\u00f6r automatiserad produktion, tunna sektioner, komplexa geometrier och tillverkning i stora volymer. Det kommersiella utbudet av LSR-produkter omfattar till\u00e4mpningar inom fordonsindustrin, h\u00e4lso- och sjukv\u00e5rden, elindustrin, produkter som kommer i kontakt med livsmedel samt allm\u00e4nna konsumentprodukter.<\/p>\n\n\n\n
I den h\u00e4r guiden beskrivs hur man v\u00e4ljer en l\u00e4mplig LSR-kvalitet f\u00f6r medicinska produkter, fordonsprodukter och konsumentprodukter.<\/p>\n\n\n\n
![\"\"](\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/How-to-Choose-the-Right-LSR-Grade-for-Medical-Automotive-and-Consumer-Products-1024x768.png\")
<\/figure>\n\n\n\nB\u00f6rja med ans\u00f6kan, inte med materialdatabladet<\/h2>\n\n\n\n
Ett materialdatablad blir f\u00f6rst anv\u00e4ndbart n\u00e4r kraven f\u00f6r till\u00e4mpningen har fastst\u00e4llts.<\/p>\n\n\n\n
Innan du j\u00e4mf\u00f6r LSR-kvaliteter b\u00f6r du dokumentera f\u00f6ljande:<\/p>\n\n\n\n
- \n
- Produktens avsedda funktion<\/li>\n\n\n\n
- Typ av anv\u00e4ndarkontakt<\/li>\n\n\n\n
- Kontaktens varaktighet<\/li>\n\n\n\n
- Driftstemperaturomr\u00e5de<\/li>\n\n\n\n
- Uts\u00e4ttning f\u00f6r vatten, oljor, br\u00e4nslen eller reng\u00f6ringsmedel<\/li>\n\n\n\n
- N\u00f6dv\u00e4ndig flexibilitet<\/li>\n\n\n\n
- Erforderligt t\u00e4tningstryck<\/li>\n\n\n\n
- F\u00f6rv\u00e4ntad livsl\u00e4ngd f\u00f6r produkten<\/li>\n\n\n\n
- Antal kompressions- eller aktiveringscykler<\/li>\n\n\n\n
- Steriliserings- eller reng\u00f6ringsprocess<\/li>\n\n\n\n
- Krav p\u00e5 genomskinlighet och f\u00e4rg<\/li>\n\n\n\n
- Insatser av plast, metall eller kabel<\/li>\n\n\n\n
- Produktionsvolym<\/li>\n\n\n\n
- M\u00e5lmarknad<\/li>\n\n\n\n
- N\u00f6dv\u00e4ndiga dokument f\u00f6r efterlevnad<\/li>\n<\/ul>\n\n\n\n
En medicinsk ventil, en t\u00e4tning till en bilanslutning och ett dricktillbeh\u00f6r f\u00f6r konsumenter kan alla tillverkas genom formsprutning av LSR, men det inneb\u00e4r inte automatiskt att samma sammans\u00e4ttning ska anv\u00e4ndas.<\/p>\n\n\n\n
Den valda klassificeringen m\u00e5ste \u00f6verensst\u00e4mma med komponentens faktiska risk- och prestandaprofil.<\/p>\n\n\n\n
F\u00f6rst\u00e5 de viktigaste urvalskriterierna f\u00f6r LSR<\/h2>\n\n\n\n
Shore A-h\u00e5rdhet<\/h3>\n\n\n\n
H\u00e5rdheten p\u00e5verkar hur l\u00e4tt en LSR-komponent deformeras under tryck.<\/p>\n\n\n\n
Mjukare kvaliteter kan erbjuda:<\/p>\n\n\n\n
- \n
- L\u00e4gre kompressionskraft<\/li>\n\n\n\n
- B\u00e4ttre anpassning till oj\u00e4mna ytor<\/li>\n\n\n\n
- B\u00e4ttre d\u00e4mpning<\/li>\n\n\n\n
- En mjuk yta<\/li>\n\n\n\n
- Enklare deformation i ventiler och membran<\/li>\n<\/ul>\n\n\n\n
Mycket mjuka material kan dock ocks\u00e5 ha:<\/p>\n\n\n\n
- \n
- Minskad dimensionsstabilitet<\/li>\n\n\n\n
- \u00d6kad risk f\u00f6r att t\u00e4tningen rullar sig<\/li>\n\n\n\n
- Mer komplicerad automatiserad hantering<\/li>\n\n\n\n
- \u00d6kad dammupptagning<\/li>\n\n\n\n
- St\u00f6rre deformation vid urformning<\/li>\n\n\n\n
- Mindre motst\u00e5nd vid extrudering<\/li>\n<\/ul>\n\n\n\n
Sv\u00e5rare niv\u00e5er kan inneb\u00e4ra:<\/p>\n\n\n\n
- \n
- Mer stabila m\u00e5tt<\/li>\n\n\n\n
- Enklare hantering<\/li>\n\n\n\n
- B\u00e4ttre st\u00f6d f\u00f6r smala objekt<\/li>\n\n\n\n
- St\u00f6rre motst\u00e5ndskraft mot f\u00f6rskjutning<\/li>\n\n\n\n
- En fastare k\u00e4nsla vid ber\u00f6ring<\/li>\n<\/ul>\n\n\n\n
De kan ocks\u00e5 kr\u00e4va st\u00f6rre monterings- eller man\u00f6vreringskraft.<\/p>\n\n\n\n
H\u00e5rdheten b\u00f6r d\u00e4rf\u00f6r v\u00e4ljas ut med h\u00e4nsyn till v\u00e4ggtjocklek, t\u00e4tningens geometri och f\u00f6rv\u00e4ntad kompression.<\/p>\n\n\n\n
Dragh\u00e5llfasthet och t\u00f6jning<\/h3>\n\n\n\n
Dragh\u00e5llfastheten anger hur stor dragbelastning det h\u00e4rdade materialet kan t\u00e5la, medan t\u00f6jningen beskriver hur mycket det kan str\u00e4ckas ut innan det g\u00e5r s\u00f6nder.<\/p>\n\n\n\n
Dessa egenskaper \u00e4r viktiga f\u00f6r:<\/p>\n\n\n\n
- \n
- Tunna membran<\/li>\n\n\n\n
- T\u00f6jbara komponenter<\/li>\n\n\n\n
- Remmar till b\u00e4rbara enheter<\/li>\n\n\n\n
- Ventilkomponenter<\/li>\n\n\n\n
- Avformning av detaljer med undersk\u00e4rningar<\/li>\n\n\n\n
- Produkter som har b\u00f6jts upprepade g\u00e5nger<\/li>\n\n\n\n
- Komponenter monterade \u00f6ver styva element<\/li>\n<\/ul>\n\n\n\n
H\u00f6g t\u00f6jning \u00e4r en f\u00f6rdel, men b\u00f6r inte betraktas som den enda faktorn. Ett mycket t\u00f6jbart material kan \u00e4nd\u00e5 l\u00e4tt g\u00e5 s\u00f6nder vid en skarp h\u00f6rn eller en formad sk\u00e5ra.<\/p>\n\n\n\n
Rivh\u00e5llfasthet<\/h3>\n\n\n\n
Rivh\u00e5llfastheten \u00e4r s\u00e4rskilt viktig n\u00e4r en komponent best\u00e5r av:<\/p>\n\n\n\n
- \n
- Tunna t\u00e4tningsl\u00e4ppar<\/li>\n\n\n\n
- Slitsar<\/li>\n\n\n\n
- Lediga tj\u00e4nster<\/li>\n\n\n\n
- Egenskaper hos snap-over-enheten<\/li>\n\n\n\n
- Smala v\u00e4ggsektioner<\/li>\n\n\n\n
- Djupa undersk\u00e4rningar<\/li>\n\n\n\n
- St\u00e4llen d\u00e4r b\u00f6jningen upprepas<\/li>\n<\/ul>\n\n\n\n
LSR-komponenter g\u00e5r ofta s\u00f6nder p\u00e5 grund av ett litet snitt eller en kantdefekt snarare \u00e4n en j\u00e4mn dragbelastning.<\/p>\n\n\n\n
En produkt som m\u00e5ste str\u00e4ckas ut vid installationen b\u00f6r utformas med rundade \u00f6verg\u00e5ngar och ha tillr\u00e4cklig rivh\u00e5llfasthet.<\/p>\n\n\n\n
Kompressionss\u00e4ttning<\/h3>\n\n\n\n
Kompressionss\u00e4ttningen anger hur stor permanent deformation som kvarst\u00e5r efter att ett elastomer har komprimerats under en best\u00e4md tid och vid en best\u00e4md temperatur.<\/p>\n\n\n\n
Det \u00e4r s\u00e4rskilt viktigt f\u00f6r:<\/p>\n\n\n\n
- \n
- T\u00e4tningar f\u00f6r bilkopplingar<\/li>\n\n\n\n
- Kantpackningar<\/li>\n\n\n\n
- Medicinska f\u00f6rseglingar<\/li>\n\n\n\n
- T\u00e4tningar f\u00f6r l\u00e5ngvarig anv\u00e4ndning i byggnader<\/li>\n\n\n\n
- O-ringar<\/li>\n\n\n\n
- Komponenter f\u00f6r kabelgenomf\u00f6ring<\/li>\n<\/ul>\n\n\n\n
En l\u00e5g kompressionsf\u00f6rvr\u00e4ngning bidrar till att t\u00e4tningen bibeh\u00e5ller sitt anpresstryck \u00e4ven vid l\u00e5ngvarig anv\u00e4ndning.<\/p>\n\n\n\n
LSR-kvaliteter avsedda f\u00f6r fordonsindustrin kan formuleras f\u00f6r l\u00e5g kompressionss\u00e4ttning, sj\u00e4lvsm\u00f6rjning och motst\u00e5ndskraft mot termisk \u00e5ldring. I leverant\u00f6rernas offentliggjorda sortiment anges till exempel specialmaterial f\u00f6r kabelt\u00e4tningar, matt\u00e4tningar, genomf\u00f6ringar och kontaktpakningar, ist\u00e4llet f\u00f6r att betrakta LSR f\u00f6r allm\u00e4nt bruk som utbytbart med t\u00e4tningskvaliteter avsedda f\u00f6r fordonsindustrin.<\/p>\n\n\n\n
Modul<\/h3>\n\n\n\n
Modulen beskriver materialets motst\u00e5ndskraft mot deformation.<\/p>\n\n\n\n
Tv\u00e5 kvaliteter med samma Shore-h\u00e5rdhet kan uppvisa olika kraft-t\u00f6jningsbeteende.<\/p>\n\n\n\n
Modulen p\u00e5verkar:<\/p>\n\n\n\n
- \n
- Ventil\u00f6ppningstryck<\/li>\n\n\n\n
- Tryckkraft f\u00f6r knappen<\/li>\n\n\n\n
- T\u00e4tningskompression<\/li>\n\n\n\n
- Diafragmans r\u00f6relse<\/li>\n\n\n\n
- Monteringskraft<\/li>\n\n\n\n
- Produktk\u00e4nsla<\/li>\n<\/ul>\n\n\n\n
N\u00e4r det g\u00e4ller funktionella komponenter \u00e4r det ofta mer meningsfullt att utf\u00f6ra kraftprovning p\u00e5 den faktiska geometrin \u00e4n att enbart f\u00f6rlita sig p\u00e5 Shore-h\u00e5rdhet.<\/p>\n\n\n\n
\u00d6ppenhet<\/h3>\n\n\n\n
Optiskt klart eller genomskinligt LSR kan beh\u00f6vas f\u00f6r:<\/p>\n\n\n\n
- \n
- Komponenter i v\u00e4tskebanan f\u00f6r medicinska \u00e4ndam\u00e5l<\/li>\n\n\n\n
- Diagnostiska produkter<\/li>\n\n\n\n
- Babyprodukter<\/li>\n\n\n\n
- Belysningskomponenter<\/li>\n\n\n\n
- Optiska gr\u00e4nssnitt<\/li>\n\n\n\n
- Konsumentprodukter d\u00e4r renheten m\u00e5ste vara synlig<\/li>\n<\/ul>\n\n\n\n
\u00d6ppenheten kan p\u00e5verkas av:<\/p>\n\n\n\n
- \n
- Materialsammans\u00e4ttning<\/li>\n\n\n\n
- Pigment<\/li>\n\n\n\n
- Formfinish<\/li>\n\n\n\n
- V\u00e4ggtjocklek<\/li>\n\n\n\n
- H\u00e4rdningsf\u00f6rh\u00e5llanden<\/li>\n\n\n\n
- Efterh\u00e4rdning<\/li>\n\n\n\n
- F\u00f6rorening<\/li>\n\n\n\n
- Sterilisering eller \u00e5ldrande<\/li>\n<\/ul>\n\n\n\n
Betyget \u201cgodk\u00e4nd\u201d b\u00f6r bed\u00f6mas utifr\u00e5n den avsedda tjockleken och ytfinheten p\u00e5 delen.<\/p>\n\n\n\n
Viskositet och fl\u00f6de<\/h3>\n\n\n\n
Materialets viskositet p\u00e5verkar formfyllningen.<\/p>\n\n\n\n
LSR med l\u00e4gre viskositet kan vara f\u00f6rdelaktigt f\u00f6r:<\/p>\n\n\n\n
- \n
- Tunna v\u00e4ggar<\/li>\n\n\n\n
- L\u00e5nga fl\u00f6desv\u00e4gar<\/li>\n\n\n\n
- Sm\u00e5 t\u00e4tningsribbor<\/li>\n\n\n\n
- Mikroegenskaper<\/li>\n\n\n\n
- Formar med flera h\u00e5lrum<\/li>\n<\/ul>\n\n\n\n
Dock kan LSR med h\u00f6g flytbarhet ocks\u00e5 \u00f6ka risken f\u00f6r flash vid delningslinjerna och runt insatserna.<\/p>\n\n\n\n
R\u00e4tt betyg m\u00e5ste st\u00e4mma \u00f6verens med:<\/p>\n\n\n\n
- \n
- Portstorlek<\/li>\n\n\n\n
- L\u00f6parsystem<\/li>\n\n\n\n
- Utformning av kaviteten<\/li>\n\n\n\n
- Avluftning<\/li>\n\n\n\n
- Insprutningstryck<\/li>\n\n\n\n
- Noggrannhet vid formavst\u00e4ngning<\/li>\n<\/ul>\n\n\n\n
L\u00e4kningshastighet<\/h3>\n\n\n\n
Snabbt h\u00e4rdande kvaliteter kan f\u00f6rkorta cykeltiden och f\u00f6rb\u00e4ttra produktionseffektiviteten.<\/p>\n\n\n\n
En mycket snabb h\u00e4rdning kan dock f\u00f6rkorta den tillg\u00e4ngliga fyllningstiden f\u00f6r:<\/p>\n\n\n\n
- \n
- Stora komponenter<\/li>\n\n\n\n
- L\u00e5nga fl\u00f6desv\u00e4gar<\/li>\n\n\n\n
- Delar tillverkade av flera material<\/li>\n\n\n\n
- Komplexa projekt inom insatsgjutning<\/li>\n<\/ul>\n\n\n\n
Ett material som h\u00e4rdar snabbt i en enkel testform kan uppf\u00f6ra sig annorlunda i en stor produktionsform.<\/p>\n\n\n\n
Krav efter h\u00e4rdning<\/h3>\n\n\n\n
Vissa till\u00e4mpningar eller materialkvaliteter kan kr\u00e4va efterh\u00e4rdning f\u00f6r att stabilisera egenskaperna eller minska vissa flyktiga rest\u00e4mnen.<\/p>\n\n\n\n
Efterh\u00e4rdning kan p\u00e5verka:<\/p>\n\n\n\n
- \n
- M\u00e5tt<\/li>\n\n\n\n
- H\u00e5rdhet<\/li>\n\n\n\n
- F\u00e4rg<\/li>\n\n\n\n
- Kompressionss\u00e4ttning<\/li>\n\n\n\n
- Inneh\u00e5ll av flyktiga \u00e4mnen<\/li>\n\n\n\n
- Produktionskostnad<\/li>\n\n\n\n
- Leveranstid<\/li>\n<\/ul>\n\n\n\n
Behovet av efterh\u00e4rdning b\u00f6r fastst\u00e4llas innan offerten l\u00e4mnas, eftersom detta medf\u00f6r krav p\u00e5 ytterligare utrustning, energi, hantering och kontroll.<\/p>\n\n\n\n
Att v\u00e4lja LSR f\u00f6r medicinska komponenter<\/h2>\n\n\n\n
Valet av medicinskt LSR utg\u00e5r fr\u00e5n produktens avsedda anv\u00e4ndningsomr\u00e5de samt typen och varaktigheten av kontakten med patienten.<\/p>\n\n\n\n
FDA:s ramverk f\u00f6r biologisk utv\u00e4rdering indelar kontakttiden i kategorierna \u201dbegr\u00e4nsad\u201d, \u201df\u00f6rl\u00e4ngd\u201d eller \u201dl\u00e5ngvarig\u201d och beaktar karakt\u00e4ren av kroppskontakten vid fastst\u00e4llandet av relevanta biologiska effektparametrar. Silikonets biologiska l\u00e4mplighet m\u00e5ste i slut\u00e4ndan bed\u00f6mas utifr\u00e5n dess avsedda anv\u00e4ndning, och data fr\u00e5n den f\u00e4rdiga produkten \u00e4r i allm\u00e4nhet mer relevanta \u00e4n data fr\u00e5n enbart oh\u00e4rdat r\u00e5material.<\/p>\n\n\n\n
Ange kontakttyp<\/h3>\n\n\n\n
Fastst\u00e4ll om den f\u00e4rdiga produkten kommer i kontakt med:<\/p>\n\n\n\n
- \n
- Intakt hud<\/li>\n\n\n\n
- Slemhinnor<\/li>\n\n\n\n
- Skadade ytor<\/li>\n\n\n\n
- V\u00e4vnad<\/li>\n\n\n\n
- Blod<\/li>\n\n\n\n
- En v\u00e4tskebana som indirekt kommer i kontakt med patienten<\/li>\n\n\n\n
- Omr\u00e5de utan patientkontakt<\/li>\n<\/ul>\n\n\n\n
Ett handtag p\u00e5 medicinsk utrustning som kommer i kontakt med intakt hud bed\u00f6ms inte p\u00e5 samma s\u00e4tt som en implanterad komponent eller en ventil f\u00f6r v\u00e4tsketillf\u00f6rsel.<\/p>\n\n\n\n
Granska tillg\u00e4nglig information om biologiskt st\u00f6d<\/h3>\n\n\n\n
En kandidatniv\u00e5 inom medicinsk LSR kan styrkas genom:<\/p>\n\n\n\n
- \n
- Information om biokompatibilitetstest<\/li>\n\n\n\n
- Information om kemisk karakterisering<\/li>\n\n\n\n
- Materialidentifiering<\/li>\n\n\n\n
- Sp\u00e5rbarhet av partier<\/li>\n\n\n\n
- Rekommendationer f\u00f6r bearbetning<\/li>\n\n\n\n
- Riktlinjer f\u00f6r hantering av leverant\u00f6rsbyten<\/li>\n<\/ul>\n\n\n\n
Vissa kommersiella LSR-kvaliteter marknadsf\u00f6rs f\u00f6r anv\u00e4ndning inom h\u00e4lso- och sjukv\u00e5rden, till exempel f\u00f6r ventiler, intraven\u00f6sa komponenter, t\u00e4tningselement, andningsprodukter och andra medicinska precisionskomponenter. Det \u00e4r dock tillverkaren av den f\u00e4rdiga produkten som har ansvaret f\u00f6r att avg\u00f6ra om den f\u00e4rdiga produkten \u00e4r l\u00e4mplig f\u00f6r sitt avsedda anv\u00e4ndningsomr\u00e5de.<\/p>\n\n\n\n
Granskningen b\u00f6r bekr\u00e4fta f\u00f6ljande:<\/p>\n\n\n\n
- \n
- Den exakta kvaliteten som testats<\/li>\n\n\n\n
- Om samma pigment ingick<\/li>\n\n\n\n
- H\u00e4rdnings- och efterh\u00e4rdningsf\u00f6rh\u00e5llandena<\/li>\n\n\n\n
- Om testningen utg\u00f6r den sista delen<\/li>\n\n\n\n
- Om uppgifterna fortfarande \u00e4r aktuella<\/li>\n\n\n\n
- Om ytterligare enhetsspecifik utv\u00e4rdering kr\u00e4vs<\/li>\n<\/ul>\n\n\n\n
Utv\u00e4rdera steriliseringskompatibilitet<\/h3>\n\n\n\n
Medicinska komponenter kan uts\u00e4ttas f\u00f6r:<\/p>\n\n\n\n
- \n
- Etylenoxid<\/li>\n\n\n\n
- \u00c5nga<\/li>\n\n\n\n
- Gammastr\u00e5lning<\/li>\n\n\n\n
- Elektronstr\u00e5lning<\/li>\n\n\n\n
- R\u00f6ntgenbearbetning<\/li>\n\n\n\n
- F\u00f6r\u00e5ngad v\u00e4teperoxid<\/li>\n\n\n\n
- Upprepad desinfektion<\/li>\n<\/ul>\n\n\n\n
Steriliseringen kan p\u00e5verka:<\/p>\n\n\n\n
- \n
- F\u00e4rg<\/li>\n\n\n\n
- \u00d6ppenhet<\/li>\n\n\n\n
- H\u00e5rdhet<\/li>\n\n\n\n
- F\u00f6rl\u00e4ngning<\/li>\n\n\n\n
- Rivh\u00e5llfasthet<\/li>\n\n\n\n
- Kompressionss\u00e4ttning<\/li>\n\n\n\n
- Ytans skick<\/li>\n\n\n\n
- Vidh\u00e5llningsstyrka<\/li>\n\n\n\n
- Extraherbara \u00e4mnen<\/li>\n<\/ul>\n\n\n\n
Vid provningen ska den avsedda steriliseringsmetoden och det h\u00f6gsta f\u00f6rv\u00e4ntade antalet cykler anv\u00e4ndas.<\/p>\n\n\n\n
Beakta renlighet och tillverkningskontroller<\/h3>\n\n\n\n
Medicinska produkter kan kr\u00e4va kontroller avseende:<\/p>\n\n\n\n
- \n
- Korskontaminering<\/li>\n\n\n\n
- Materialsp\u00e5rbarhet<\/li>\n\n\n\n
- Formens renhet<\/li>\n\n\n\n
- Efterh\u00e4rdning<\/li>\n\n\n\n
- Partikelhalter<\/li>\n\n\n\n
- Hantering<\/li>\n\n\n\n
- Tv\u00e4tt<\/li>\n\n\n\n
- F\u00f6rpackning<\/li>\n\n\n\n
- Produktionsstatistik<\/li>\n\n\n\n
- V\u00e4sentliga f\u00f6r\u00e4ndringar<\/li>\n<\/ul>\n\n\n\n
Det \u00e4r inte alla silikonkomponenter f\u00f6r medicinskt bruk som kr\u00e4ver samma tillverkningsmilj\u00f6, men fabrikens kontrollrutiner b\u00f6r vara anpassade efter den identifierade risken.<\/p>\n\n\n\n
V\u00e4lj mekaniska egenskaper f\u00f6r funktionen<\/h3>\n\n\n\n
Inom medicinska till\u00e4mpningar kan olika egenskaper prioriteras:<\/p>\n\n\n\n
Medicinsk del<\/th> Viktiga egenskaper hos LSR<\/th><\/tr> Ventil eller membran<\/td> Kontrollerad elasticitetsmodul, utmattningsh\u00e5llfasthet, j\u00e4mna m\u00e5tt<\/td><\/tr> T\u00e4tning f\u00f6r andningsmask<\/td> Mjukhet, rivh\u00e5llfasthet, hudv\u00e4nlighet, l\u00e5g kompressionsf\u00f6rskjutning<\/td><\/tr> T\u00e4tning f\u00f6r koppling<\/td> Dimensionsstabilitet, t\u00e4tningsf\u00f6rm\u00e5ga, sp\u00e5rbarhet<\/td><\/tr> \u00d6verformning av medicinska kablar<\/td> Vidh\u00e4ftning, flexibilitet, dragavlastning och rivh\u00e5llfasthet<\/td><\/tr> Genomskinlig v\u00e4tskekomponent<\/td> Clarity, cleanliness and representative biological evaluation<\/td><\/tr> Wearable skin-contact part<\/td> Comfort, cleaning resistance and pigmentation control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u201cMedical grade\u201d should not replace a detailed mechanical specification.<\/p>\n\n\n\n
Choosing LSR for Automotive Components<\/h2>\n\n\n\n
Automotive LSR parts may be exposed to long-term heat, thermal cycling, vibration, humidity, oils, fuels and continuous compression.<\/p>\n\n\n\n
Typiska anv\u00e4ndningsomr\u00e5den \u00e4r bland annat:<\/p>\n\n\n\n
- \n
- T\u00e4tningar f\u00f6r kopplingar<\/li>\n\n\n\n
- Wire seals<\/li>\n\n\n\n
- Matta-t\u00e4tningar<\/li>\n\n\n\n
- Kantpackningar<\/li>\n\n\n\n
- Sensort\u00e4tningar<\/li>\n\n\n\n
- Komponenter f\u00f6r kabelgenomf\u00f6ring<\/li>\n\n\n\n
- Battery-system seals<\/li>\n\n\n\n
- Plastic-and-LSR overmolded housings<\/li>\n<\/ul>\n\n\n\n
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
Prioritize Heat-Aging Performance<\/h3>\n\n\n\n
Do not select an automotive grade using only its short-term maximum temperature.<\/p>\n\n\n\n
Request information about:<\/p>\n\n\n\n
- \n
- Continuous-use temperature<\/li>\n\n\n\n
- Heat aging<\/li>\n\n\n\n
- Property change after aging<\/li>\n\n\n\n
- Compression set at elevated temperature<\/li>\n\n\n\n
- Prestanda efter termisk cykling<\/li>\n\n\n\n
- Compatibility with adjacent thermoplastics<\/li>\n<\/ul>\n\n\n\n
A seal may remain visually intact but lose sufficient recovery force to prevent moisture ingress.<\/p>\n\n\n\n
Define Fluid Exposure<\/h3>\n\n\n\n
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
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
Material testing should use the actual:<\/p>\n\n\n\n
- \n
- Fluid<\/li>\n\n\n\n
- Concentration<\/li>\n\n\n\n
- Temperature<\/li>\n\n\n\n
- Exposure duration<\/li>\n\n\n\n
- Mechanical condition<\/li>\n<\/ul>\n\n\n\n
Evaluate Self-Lubricating Grades<\/h3>\n\n\n\n
Automotive connector seals can generate high friction when wires or terminals are inserted.<\/p>\n\n\n\n
A self-lubricating grade may help reduce:<\/p>\n\n\n\n
- \n
- Insertion force<\/li>\n\n\n\n
- Seal tearing<\/li>\n\n\n\n
- T\u00e4tningens f\u00f6rskjutning<\/li>\n\n\n\n
- Assembly variation<\/li>\n<\/ul>\n\n\n\n
Published automotive grades include different internal oil levels for connector and radial-sealing applications.<\/p>\n\n\n\n
The complete connector should still be evaluated for:<\/p>\n\n\n\n
- \n
- Lubricant migration<\/li>\n\n\n\n
- Dammansamling<\/li>\n\n\n\n
- Contact contamination<\/li>\n\n\n\n
- Long-term consistency<\/li>\n\n\n\n
- Storage effects<\/li>\n<\/ul>\n\n\n\n
Consider Overmolding Adhesion<\/h3>\n\n\n\n
Automotive components frequently combine LSR with PBT, polyamide or other engineering thermoplastics.<\/p>\n\n\n\n
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
The actual production plastic should be tested because adhesion can be affected by:<\/p>\n\n\n\n
- \n
- Glass-fiber content<\/li>\n\n\n\n
- Pigment<\/li>\n\n\n\n
- Flame retardants<\/li>\n\n\n\n
- Mold-release additives<\/li>\n\n\n\n
- Fukt<\/li>\n\n\n\n
- Ytf\u00f6rorening<\/li>\n\n\n\n
- Insert temperature<\/li>\n\n\n\n
- Storage time<\/li>\n<\/ul>\n\n\n\n
Match Hardness to the Seal Geometry<\/h3>\n\n\n\n
A softer grade may reduce insertion or compression force, while a harder grade may improve dimensional stability.<\/p>\n\n\n\n
The final selection should be verified through:<\/p>\n\n\n\n
- \n
- Tolerance analysis<\/li>\n\n\n\n
- Assembly-force testing<\/li>\n\n\n\n
- L\u00e4ckagetestning<\/li>\n\n\n\n
- Heat aging<\/li>\n\n\n\n
- Termisk cykling<\/li>\n\n\n\n
- Vibration testing<\/li>\n\n\n\n
- Exponering f\u00f6r v\u00e4tska<\/li>\n<\/ul>\n\n\n\n
Choosing LSR for Consumer Products<\/h2>\n\n\n\n
Consumer LSR applications can include:<\/p>\n\n\n\n
- \n
- Baby feeding accessories<\/li>\n\n\n\n
- Kitchenware<\/li>\n\n\n\n
- Drinkware components<\/li>\n\n\n\n
- Wearable products<\/li>\n\n\n\n
- Personal-care products<\/li>\n\n\n\n
- Sports accessories<\/li>\n\n\n\n
- Skydds\u00f6verdrag<\/li>\n\n\n\n
- Appliance seals<\/li>\n\n\n\n
- Buttons and keypads<\/li>\n\n\n\n
- Household products<\/li>\n<\/ul>\n\n\n\n
General-purpose LSR portfolios include grades designed for cooking products, gaskets, seals, sports equipment and other consumer goods.<\/p>\n\n\n\n
Confirm the Contact Requirement<\/h3>\n\n\n\n
Consumer products may require different documentation depending on whether they contact:<\/p>\n\n\n\n
- \n
- Food<\/li>\n\n\n\n
- Drinking water<\/li>\n\n\n\n
- Skin<\/li>\n\n\n\n
- A child\u2019s mouth<\/li>\n\n\n\n
- Electronics<\/li>\n\n\n\n
- Household chemicals<\/li>\n\n\n\n
- No regulated contact area<\/li>\n<\/ul>\n\n\n\n
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
Balance Softness and Durability<\/h3>\n\n\n\n
Soft-touch consumer products are often designed using low-hardness LSR, but excessive softness may create:<\/p>\n\n\n\n
- \n
- Poor dimensional stability<\/li>\n\n\n\n
- Sv\u00e5r montering<\/li>\n\n\n\n
- Surface tack<\/li>\n\n\n\n
- Dammansamling<\/li>\n\n\n\n
- Weak thin sections<\/li>\n\n\n\n
- Slow elastic recovery<\/li>\n<\/ul>\n\n\n\n
For teethers, valves, buttons and wearable parts, the final selection should reflect both tactile preference and functional durability.<\/p>\n\n\n\n
Evaluate Color and Appearance<\/h3>\n\n\n\n
Consumer products frequently require customized colors.<\/p>\n\n\n\n
The pigment system should be reviewed for:<\/p>\n\n\n\n
- \n
- Intended contact application<\/li>\n\n\n\n
- F\u00e4rgkonsistens<\/li>\n\n\n\n
- Light stability<\/li>\n\n\n\n
- V\u00e4rmebest\u00e4ndighet<\/li>\n\n\n\n
- Migration or extraction requirements<\/li>\n\n\n\n
- Effect on transparency<\/li>\n\n\n\n
- Effect on curing<\/li>\n<\/ul>\n\n\n\n
Strong colors may require more pigment, which can change appearance and, in some formulations, processing behavior.<\/p>\n\n\n\n
Consider Odor and Volatile Requirements<\/h3>\n\n\n\n
Products used near food, the face or infant-care applications may require strict odor control.<\/p>\n\n\n\n
Odor can be influenced by:<\/p>\n\n\n\n
- \n
- Materialsammans\u00e4ttning<\/li>\n\n\n\n
- Curing<\/li>\n\n\n\n
- Efterh\u00e4rdning<\/li>\n\n\n\n
- Storage<\/li>\n\n\n\n
- F\u00f6rpackning<\/li>\n\n\n\n
- Reng\u00f6ring<\/li>\n\n\n\n
- F\u00f6rorening<\/li>\n<\/ul>\n\n\n\n
The customer should evaluate finished packaged products rather than only newly molded samples.<\/p>\n\n\n\n
Choose for the Actual User Experience<\/h3>\n\n\n\n
Consumer components may be evaluated through:<\/p>\n\n\n\n
- \n
- Grip comfort<\/li>\n\n\n\n
- Button force<\/li>\n\n\n\n
- Ytstruktur<\/li>\n\n\n\n
- Flexibilitet<\/li>\n\n\n\n
- Produktens vikt<\/li>\n\n\n\n
- Ease of cleaning<\/li>\n\n\n\n
- Stain resistance<\/li>\n\n\n\n
- Odor<\/li>\n\n\n\n
- Dammansamling<\/li>\n\n\n\n
- Visual appearance<\/li>\n<\/ul>\n\n\n\n
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
Standard, Self-Lubricating, Self-Bonding and Fluoro-LSR Grades<\/h2>\n\n\n\n
Different LSR families solve different problems.<\/p>\n\n\n\n
General-Purpose LSR<\/h3>\n\n\n\n
Suitable for many basic molded products where special adhesion, fluid resistance or biological documentation is not required.<\/p>\n\n\n\n
Typical uses include:<\/p>\n\n\n\n
- \n
- Consumer goods<\/li>\n\n\n\n
- Grommets<\/li>\n\n\n\n
- Basic seals<\/li>\n\n\n\n
- Sports products<\/li>\n\n\n\n
- Household components<\/li>\n<\/ul>\n\n\n\n
Medical-Support LSR<\/h3>\n\n\n\n
Selected for healthcare components requiring controlled formulation, traceability and relevant biological-support information.<\/p>\n\n\n\n
The finished medical device still requires a risk-based evaluation.<\/p>\n\n\n\n
Self-Lubricating LSR<\/h3>\n\n\n\n
Designed to develop a lower-friction surface.<\/p>\n\n\n\n
Typical uses include:<\/p>\n\n\n\n
- \n
- T\u00e4tningar f\u00f6r kopplingar<\/li>\n\n\n\n
- Sliding components<\/li>\n\n\n\n
- Medical components requiring low surface friction<\/li>\n\n\n\n
- Automated assembly applications<\/li>\n<\/ul>\n\n\n\n
Momentive has described self-lubricating LSR formulations for healthcare applications requiring a high-slip surface.<\/p>\n\n\n\n
Self-Bonding LSR<\/h3>\n\n\n\n
Designed to bond directly to selected plastic or metal substrates during molding.<\/p>\n\n\n\n
Typical uses include:<\/p>\n\n\n\n
- \n
- Plastic-LSR housings<\/li>\n\n\n\n
- Overmolded medical connectors<\/li>\n\n\n\n
- T\u00e4tningar f\u00f6r bilkopplingar<\/li>\n\n\n\n
- Soft-touch consumer assemblies<\/li>\n<\/ul>\n\n\n\n
Compatibility must be verified using the exact substrate.<\/p>\n\n\n\n
Fluoro-LSR<\/h3>\n\n\n\n
Selected where improved resistance to fuels, oils and non-polar solvents is required.<\/p>\n\n\n\n
It may be useful in:<\/p>\n\n\n\n
- \n
- Automotive fluid-exposure components<\/li>\n\n\n\n
- Industrial seals<\/li>\n\n\n\n
- Specialized electrical parts<\/li>\n<\/ul>\n\n\n\n
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
Conductive LSR<\/h3>\n\n\n\n
Selected for:<\/p>\n\n\n\n
- \n
- Antistatic components<\/li>\n\n\n\n
- EMI shielding<\/li>\n\n\n\n
- Conductive seals<\/li>\n\n\n\n
- Electrical field control<\/li>\n\n\n\n
- Flexible contacts<\/li>\n<\/ul>\n\n\n\n
Electrical resistivity and test conditions must be specified separately from mechanical properties.<\/p>\n\n\n\n
Overmolding Requirements<\/h2>\n\n\n\n
LSR can be molded onto plastic, metal, cable or electronic inserts.<\/p>\n\n\n\n
Before selecting an overmolding grade, define:<\/p>\n\n\n\n
- \n
- Insert material<\/li>\n\n\n\n
- Insert geometry<\/li>\n\n\n\n
- Bonding requirement<\/li>\n\n\n\n
- Mechanical interlocks<\/li>\n\n\n\n
- Insert temperature resistance<\/li>\n\n\n\n
- Primer or surface-treatment needs<\/li>\n\n\n\n
- Peel and pull requirements<\/li>\n\n\n\n
- Exponering f\u00f6r v\u00e4tska<\/li>\n\n\n\n
- Sterilization or aging conditions<\/li>\n<\/ul>\n\n\n\n
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
A reliable overmolding evaluation should use:<\/p>\n\n\n\n
- \n
- Production-grade inserts<\/li>\n\n\n\n
- Actual pigments and fillers<\/li>\n\n\n\n
- Production-intent mold temperature<\/li>\n\n\n\n
- Representative cure time<\/li>\n\n\n\n
- Finished-part aging<\/li>\n\n\n\n
- Pull, peel or functional testing<\/li>\n<\/ul>\n\n\n\n
Why Datasheet Values May Not Predict Finished-Part Performance<\/h2>\n\n\n\n
Technical data sheets are useful for comparing candidate materials, but the values are usually generated under defined laboratory conditions.<\/p>\n\n\n\n
The finished component may behave differently because of:<\/p>\n\n\n\n
- \n
- V\u00e4ggtjocklek<\/li>\n\n\n\n
- Formtemperatur<\/li>\n\n\n\n
- Cure time<\/li>\n\n\n\n
- Gate location<\/li>\n\n\n\n
- Flow orientation<\/li>\n\n\n\n
- Weld lines<\/li>\n\n\n\n
- Efterh\u00e4rdning<\/li>\n\n\n\n
- Pigment<\/li>\n\n\n\n
- Demolding strain<\/li>\n\n\n\n
- Insert interaction<\/li>\n\n\n\n
- Sterilisering<\/li>\n\n\n\n
- Environmental aging<\/li>\n<\/ul>\n\n\n\n
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
Use datasheet values to shortlist materials, then validate the final molded product.<\/p>\n\n\n\n
Questions to Ask an LSR Material Supplier<\/h2>\n\n\n\n
Before approving a grade, request clear answers to the following questions:<\/p>\n\n\n\n
- \n
- What is the exact grade designation?<\/li>\n\n\n\n
- What is the recommended application?<\/li>\n\n\n\n
- Which hardness levels are available?<\/li>\n\n\n\n
- Is post-curing required?<\/li>\n\n\n\n
- What are the recommended molding conditions?<\/li>\n\n\n\n
- What biological-support data are available?<\/li>\n\n\n\n
- Is the grade suitable for the intended food-contact market?<\/li>\n\n\n\n
- How does it perform after heat aging?<\/li>\n\n\n\n
- What compression-set data are available?<\/li>\n\n\n\n
- Is it self-lubricating?<\/li>\n\n\n\n
- Is it self-bonding?<\/li>\n\n\n\n
- Which substrates have been evaluated?<\/li>\n\n\n\n
- Is it compatible with the intended sterilization method?<\/li>\n\n\n\n
- Is a fluoro-LSR version available?<\/li>\n\n\n\n
- What is the supplier\u2019s change-notification policy?<\/li>\n\n\n\n
- What shelf life and storage conditions apply?<\/li>\n\n\n\n
- Can the material be pigmented?<\/li>\n\n\n\n
- Can production-lot traceability be provided?<\/li>\n<\/ol>\n\n\n\n
Questions to Ask an LSR Molding Manufacturer<\/h2>\n\n\n\n
The molder should also be able to explain:<\/p>\n\n\n\n
- \n
- Whether the selected grade can fill the proposed geometry<\/li>\n\n\n\n
- Whether the mold requires vacuum assistance<\/li>\n\n\n\n
- Where gates and parting lines will be located<\/li>\n\n\n\n
- What flash limits can be maintained<\/li>\n\n\n\n
- Whether delicate features can be demolded without tearing<\/li>\n\n\n\n
- How inserts will be positioned<\/li>\n\n\n\n
- Whether primer or plasma treatment is required<\/li>\n\n\n\n
- How curing and post-curing are controlled<\/li>\n\n\n\n
- How critical dimensions will be inspected<\/li>\n\n\n\n
- How material and pigment batches are traced<\/li>\n\n\n\n
- Whether pilot production can be completed<\/li>\n\n\n\n
- Which functional tests can be supported<\/li>\n<\/ol>\n\n\n\n
A material recommendation without a design-for-manufacturing review may overlook significant tooling or production risks.<\/p>\n\n\n\n
A Practical LSR Grade Selection Process<\/h2>\n\n\n\n
Step 1: Define the Product Category<\/h3>\n\n\n\n
Determine whether the component is medical, automotive, food-contact, skin-contact, electrical or general consumer.<\/p>\n\n\n\n
Step 2: Document the Service Environment<\/h3>\n\n\n\n
Define temperature, fluids, cleaning, sterilization, UV, humidity and expected life.<\/p>\n\n\n\n
Step 3: Establish Mechanical Requirements<\/h3>\n\n\n\n
Specify hardness, compression, tensile strength, tear strength, elongation and fatigue requirements.<\/p>\n\n\n\n
Step 4: Identify Special Functions<\/h3>\n\n\n\n
Confirm whether the project requires:<\/p>\n\n\n\n
- \n
- Sj\u00e4lvsm\u00f6rjning<\/li>\n\n\n\n
- Self-bonding<\/li>\n\n\n\n
- Optical clarity<\/li>\n\n\n\n
- Conductivity<\/li>\n\n\n\n
- Flame resistance<\/li>\n\n\n\n
- Fuel resistance<\/li>\n\n\n\n
- Low compression set<\/li>\n\n\n\n
- Medical-support documentation<\/li>\n<\/ul>\n\n\n\n
Step 5: Shortlist Candidate Grades<\/h3>\n\n\n\n
Compare supplier data and eliminate materials that do not meet the basic application requirements.<\/p>\n\n\n\n
Step 6: Review Moldability<\/h3>\n\n\n\n
Evaluate viscosity, flow length, wall thickness, gates, venting, inserts and demolding.<\/p>\n\n\n\n
Step 7: Produce Representative Samples<\/h3>\n\n\n\n
Use the intended:<\/p>\n\n\n\n
- \n
- LSR grade<\/li>\n\n\n\n
- Pigment<\/li>\n\n\n\n
- Insert<\/li>\n\n\n\n
- Cure process<\/li>\n\n\n\n
- Post-curing process<\/li>\n<\/ul>\n\n\n\n
Step 8: Test the Finished Component<\/h3>\n\n\n\n
Perform dimensional, mechanical, functional and contact-related evaluation.<\/p>\n\n\n\n
Step 9: Complete Environmental Validation<\/h3>\n\n\n\n
Test after representative heat, sterilization, fluids, humidity, compression or repeated use.<\/p>\n\n\n\n
Step 10: Freeze the Approved Material and Process<\/h3>\n\n\n\n
Control:<\/p>\n\n\n\n
- \n
- Material manufacturer<\/li>\n\n\n\n
- Exact grade<\/li>\n\n\n\n
- Pigment formula<\/li>\n\n\n\n
- Supplier<\/li>\n\n\n\n
- Mixing ratio<\/li>\n\n\n\n
- Cure parameters<\/li>\n\n\n\n
- Efterh\u00e4rdning<\/li>\n\n\n\n
- Insert material<\/li>\n\n\n\n
- Inspektionsmetod<\/li>\n<\/ul>\n\n\n\n
Future substitutions should be reviewed and, where necessary, revalidated.<\/p>\n\n\n\n
Quick Comparison by Application<\/h2>\n\n\n\n
Selection factor<\/td> Medical products<\/td> Automotive products<\/td> Consumer products<\/td><\/tr> Primary concern<\/td> Biological risk and controlled manufacturing<\/td> Long-term sealing and environmental durability<\/td> Safety, function, appearance and user experience<\/td><\/tr> Key documentation<\/td> Biological-support and traceability information<\/td> Heat-aging, compression and fluid-resistance data<\/td> Relevant food-, skin- or consumer-contact documents<\/td><\/tr> Important mechanical properties<\/td> Tear strength, modulus, fatigue and cleanliness<\/td> Compression set, thermal stability and fluid resistance<\/td> Softness, durability, color and surface feel<\/td><\/tr> Common special grades<\/td> Medical-support, transparent, self-lubricating or self-bonding<\/td> Low-compression-set, self-lubricating, self-bonding or F-LSR<\/td> General-purpose, food-contact, low-density or colored LSR<\/td><\/tr> Typical validation<\/td> Finished-device biological and sterilization evaluation<\/td> Thermal cycling, leakage, vibration and fluid testing<\/td> Cleaning, odor, durability and user-function testing<\/td><\/tr> Common error<\/td> Treating raw-material data as finished-device approval<\/td> Selecting by temperature or hardness alone<\/td> Prioritizing softness and color over durability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Common LSR Selection Mistakes<\/h2>\n\n\n\n
Choosing Only by Shore Hardness<\/h3>\n\n\n\n
Hardness does not describe tear strength, compression set, adhesion, lubrication or biological-support documentation.<\/p>\n\n\n\n
Using a General-Purpose Grade for Every Application<\/h3>\n\n\n\n
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
Treating Medical Grade as Finished-Device Approval<\/h3>\n\n\n\n
The final product, processing residues, pigments, cleaning and sterilization must be considered.<\/p>\n\n\n\n
Assuming Standard LSR Resists Every Automotive Fluid<\/h3>\n\n\n\n
Fuel, oil or solvent exposure may require fluoro-LSR or another specialized elastomer.<\/p>\n\n\n\n
Ignoring Post-Curing<\/h3>\n\n\n\n
Post-curing can affect cost, dimensions, odor and product performance.<\/p>\n\n\n\n
Selecting Self-Bonding LSR Without Testing the Substrate<\/h3>\n\n\n\n
Adhesion depends on the exact plastic formulation and process.<\/p>\n\n\n\n
Approving Material from a Flat Test Slab<\/h3>\n\n\n\n
The final component geometry may produce different tear, compression and optical performance.<\/p>\n\n\n\n
Changing Pigments Without Review<\/h3>\n\n\n\n
Pigments can affect appearance, contact documentation and processing.<\/p>\n\n\n\n
Selecting the Cheapest Grade<\/h3>\n\n\n\n
A less expensive material can create higher costs through longer cycle times, poor yields, flash, tearing or product failure.<\/p>\n\n\n\n
Slutsats<\/h2>\n\n\n\n
Choosing the correct LSR grade requires more than selecting a hardness and color.<\/p>\n\n\n\n
The decision should consider:<\/p>\n\n\n\n
- \n
- Product function<\/li>\n\n\n\n
- Contact type<\/li>\n\n\n\n
- Temperature<\/li>\n\n\n\n
- Chemical exposure<\/li>\n\n\n\n
- Compression<\/li>\n\n\n\n
- Tear and fatigue requirements<\/li>\n\n\n\n
- Sterilisering<\/li>\n\n\n\n
- \u00d6ppenhet<\/li>\n\n\n\n
- Surface friction<\/li>\n\n\n\n
- Overmolding adhesion<\/li>\n\n\n\n
- Regulatory-support information<\/li>\n\n\n\n
- Moldability<\/li>\n\n\n\n
- Production consistency<\/li>\n<\/ul>\n\n\n\n
Medical products require a risk-based review of the complete finished device and its intended patient contact.<\/p>\n\n\n\n
Automotive products typically prioritize low compression set, heat aging, fluid resistance, assembly performance and long-term sealing.<\/p>\n\n\n\n
Consumer products require a balance of safety, tactile quality, durability, appearance, cleanliness and manufacturing cost.<\/p>\n\n\n\n
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
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
Vanliga fr\u00e5gor<\/h2>\n\n\n\n
Can one LSR grade be used for medical, automotive and consumer products?<\/h3>\n\n\n\n
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
Is a higher-hardness LSR more durable?<\/h3>\n\n\n\n
Not necessarily. Durability also depends on tear strength, elongation, geometry, aging and loading conditions.<\/p>\n\n\n\n
Is medical-grade LSR automatically biocompatible?<\/h3>\n\n\n\n
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
Which LSR is best for automotive connector seals?<\/h3>\n\n\n\n
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
When should fluoro-LSR be used?<\/h3>\n\n\n\n
F-LSR should be considered where improved resistance to non-polar fuels, oils or solvents is required.<\/p>\n\n\n\n
Can food-contact LSR be used for baby products?<\/h3>\n\n\n\n
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
What is self-bonding LSR?<\/h3>\n\n\n\n
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
Does self-bonding LSR adhere to every plastic?<\/h3>\n\n\n\n
No. Adhesion depends on the exact resin, additives, fillers, surface condition and molding process.<\/p>\n\n\n\n
Is post-curing always required?<\/h3>\n\n\n\n
No. The requirement depends on the material grade, intended application and performance or contact requirements.<\/p>\n\n\n\n
What information is needed for an LSR quotation?<\/h3>\n\n\n\n
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":"
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 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