For this reason, selecting an LSR grade should never be based only on hardness, color or price.<\/p>\n\n\n\n
The correct material must satisfy three groups of requirements:<\/p>\n\n\n\n
- \n
- Product performance:<\/strong> How must the finished component behave?<\/li>\n\n\n\n
- Application compliance:<\/strong> What contact, safety and documentation requirements apply?<\/li>\n\n\n\n
- Manufacturing compatibility:<\/strong> Can the grade be molded consistently in the intended geometry and production process?<\/li>\n<\/ol>\n\n\n\n
LSR is generally supplied as a two-component material that is metered, mixed and rapidly heat-cured during injection molding. Its processing characteristics make it suitable for automated production, thin sections, complex geometries and high-volume manufacturing. Commercial LSR portfolios cover automotive, healthcare, electrical, food-contact and general consumer applications.<\/p>\n\n\n\n
This guide explains how to select an appropriate LSR grade for medical, automotive and consumer products.<\/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\nBegin with the Application, Not the Material Datasheet<\/h2>\n\n\n\n
A material datasheet becomes useful only after the application requirements have been defined.<\/p>\n\n\n\n
Before comparing LSR grades, document:<\/p>\n\n\n\n
- \n
- Intended product function<\/li>\n\n\n\n
- Type of user contact<\/li>\n\n\n\n
- Duraci\u00f3n del contacto<\/li>\n\n\n\n
- Operating-temperature range<\/li>\n\n\n\n
- Exposure to water, oils, fuels or cleaning agents<\/li>\n\n\n\n
- Flexibilidad necesaria<\/li>\n\n\n\n
- Required sealing pressure<\/li>\n\n\n\n
- Expected product life<\/li>\n\n\n\n
- Number of compression or actuation cycles<\/li>\n\n\n\n
- Sterilization or cleaning process<\/li>\n\n\n\n
- Transparency and color requirements<\/li>\n\n\n\n
- Plastic, metal or cable inserts<\/li>\n\n\n\n
- Volumen de producci\u00f3n<\/li>\n\n\n\n
- Mercado objetivo<\/li>\n\n\n\n
- Required compliance documents<\/li>\n<\/ul>\n\n\n\n
A medical valve, automotive connector seal and consumer drinking accessory may all be made by LSR injection molding, but they should not automatically use the same formulation.<\/p>\n\n\n\n
The selected grade must match the actual risk and performance profile of the component.<\/p>\n\n\n\n
Understand the Main LSR Selection Criteria<\/h2>\n\n\n\n
Shore A Hardness<\/h3>\n\n\n\n
Hardness affects how easily an LSR component deforms under pressure.<\/p>\n\n\n\n
Softer grades can provide:<\/p>\n\n\n\n
- \n
- Lower compression force<\/li>\n\n\n\n
- Better conformity to uneven surfaces<\/li>\n\n\n\n
- Greater cushioning<\/li>\n\n\n\n
- A soft-touch feel<\/li>\n\n\n\n
- Easier deformation in valves and diaphragms<\/li>\n<\/ul>\n\n\n\n
However, very soft materials may also have:<\/p>\n\n\n\n
- \n
- Lower dimensional stability<\/li>\n\n\n\n
- Greater risk of seal rolling<\/li>\n\n\n\n
- More difficult automated handling<\/li>\n\n\n\n
- Increased dust attraction<\/li>\n\n\n\n
- Greater demolding deformation<\/li>\n\n\n\n
- Lower resistance to extrusion<\/li>\n<\/ul>\n\n\n\n
Harder grades may provide:<\/p>\n\n\n\n
- \n
- More stable dimensions<\/li>\n\n\n\n
- Easier handling<\/li>\n\n\n\n
- Stronger support for thin features<\/li>\n\n\n\n
- Greater resistance to displacement<\/li>\n\n\n\n
- A firmer tactile response<\/li>\n<\/ul>\n\n\n\n
They may also require higher assembly or actuation force.<\/p>\n\n\n\n
Hardness should therefore be selected together with wall thickness, seal geometry and expected compression.<\/p>\n\n\n\n
Tensile Strength and Elongation<\/h3>\n\n\n\n
Tensile strength indicates how much pulling stress the cured material can withstand, while elongation describes how far it can stretch before breaking.<\/p>\n\n\n\n
These properties are important for:<\/p>\n\n\n\n
- \n
- Membranas finas<\/li>\n\n\n\n
- Stretchable components<\/li>\n\n\n\n
- Wearable straps<\/li>\n\n\n\n
- Valve elements<\/li>\n\n\n\n
- Demolding of undercut parts<\/li>\n\n\n\n
- Repeatedly flexed products<\/li>\n\n\n\n
- Components assembled over rigid features<\/li>\n<\/ul>\n\n\n\n
High elongation is useful, but it should not be considered alone. A highly extensible material may still tear easily at a sharp corner or molded notch.<\/p>\n\n\n\n
Resistencia al desgarro<\/h3>\n\n\n\n
Tear strength is particularly important when a component includes:<\/p>\n\n\n\n
- \n
- Thin sealing lips<\/li>\n\n\n\n
- Slits<\/li>\n\n\n\n
- Openings<\/li>\n\n\n\n
- Snap-over assembly features<\/li>\n\n\n\n
- Narrow wall sections<\/li>\n\n\n\n
- Socavados profundos<\/li>\n\n\n\n
- Repeated bending points<\/li>\n<\/ul>\n\n\n\n
LSR parts often fail from a small cut or edge defect rather than uniform tensile loading.<\/p>\n\n\n\n
A product that must be stretched during installation should be designed with rounded transitions and sufficient tear resistance.<\/p>\n\n\n\n
Compression Set<\/h3>\n\n\n\n
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
It is especially important for:<\/p>\n\n\n\n
- \n
- Automotive connector seals<\/li>\n\n\n\n
- Perimeter gaskets<\/li>\n\n\n\n
- Sellos m\u00e9dicos<\/li>\n\n\n\n
- Long-term housing seals<\/li>\n\n\n\n
- Juntas t\u00f3ricas<\/li>\n\n\n\n
- Cable-entry components<\/li>\n<\/ul>\n\n\n\n
Low compression set helps a seal retain contact pressure during prolonged use.<\/p>\n\n\n\n
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
Modulus<\/h3>\n\n\n\n
Modulus describes the resistance of the material to deformation.<\/p>\n\n\n\n
Two grades with the same Shore hardness may have different force-deflection behavior.<\/p>\n\n\n\n
Modulus affects:<\/p>\n\n\n\n
- \n
- Valve-opening pressure<\/li>\n\n\n\n
- Button-actuation force<\/li>\n\n\n\n
- Seal compression<\/li>\n\n\n\n
- Diaphragm movement<\/li>\n\n\n\n
- Assembly force<\/li>\n\n\n\n
- Product feel<\/li>\n<\/ul>\n\n\n\n
For functional parts, force testing on the actual geometry is often more useful than relying only on Shore hardness.<\/p>\n\n\n\n
Transparencia<\/h3>\n\n\n\n
Optically clear or translucent LSR may be required for:<\/p>\n\n\n\n
- \n
- Medical fluid-path components<\/li>\n\n\n\n
- Diagnostic products<\/li>\n\n\n\n
- Productos para beb\u00e9s<\/li>\n\n\n\n
- Lighting parts<\/li>\n\n\n\n
- Optical interfaces<\/li>\n\n\n\n
- Consumer products where cleanliness must be visible<\/li>\n<\/ul>\n\n\n\n
Transparency can be influenced by:<\/p>\n\n\n\n
- \n
- Formulaci\u00f3n de materiales<\/li>\n\n\n\n
- Pigments<\/li>\n\n\n\n
- Mold finish<\/li>\n\n\n\n
- Espesor de la pared<\/li>\n\n\n\n
- Condiciones de curado<\/li>\n\n\n\n
- Postcurado<\/li>\n\n\n\n
- Contaminaci\u00f3n<\/li>\n\n\n\n
- Sterilization or aging<\/li>\n<\/ul>\n\n\n\n
A \u201cclear\u201d grade should be evaluated using the intended part thickness and surface finish.<\/p>\n\n\n\n
Viscosity and Flow<\/h3>\n\n\n\n
Material viscosity affects mold filling.<\/p>\n\n\n\n
Lower-viscosity LSR may be advantageous for:<\/p>\n\n\n\n
- \n
- Thin walls<\/li>\n\n\n\n
- Long flow paths<\/li>\n\n\n\n
- Small sealing ribs<\/li>\n\n\n\n
- Microfeatures<\/li>\n\n\n\n
- Moldes multicavidad<\/li>\n<\/ul>\n\n\n\n
However, highly fluid LSR can also increase the risk of flash at parting lines and around inserts.<\/p>\n\n\n\n
The correct grade must be matched with:<\/p>\n\n\n\n
- \n
- Gate size<\/li>\n\n\n\n
- Runner system<\/li>\n\n\n\n
- Cavity layout<\/li>\n\n\n\n
- Desahogo<\/li>\n\n\n\n
- Presi\u00f3n de inyecci\u00f3n<\/li>\n\n\n\n
- Mold shutoff accuracy<\/li>\n<\/ul>\n\n\n\n
Cure Speed<\/h3>\n\n\n\n
Fast-curing grades can shorten cycle time and improve production efficiency.<\/p>\n\n\n\n
However, very rapid curing may reduce the available filling time for:<\/p>\n\n\n\n
- \n
- Large components<\/li>\n\n\n\n
- Long flow paths<\/li>\n\n\n\n
- Multi-material parts<\/li>\n\n\n\n
- Complex insert-molding projects<\/li>\n<\/ul>\n\n\n\n
A material that cures quickly in a simple test mold may behave differently in a large production tool.<\/p>\n\n\n\n
Post-Curing Requirements<\/h3>\n\n\n\n
Some applications or material grades may require post-curing to stabilize properties or reduce certain volatile residues.<\/p>\n\n\n\n
Post-curing can affect:<\/p>\n\n\n\n
- \n
- Dimensiones<\/li>\n\n\n\n
- Dureza<\/li>\n\n\n\n
- Color<\/li>\n\n\n\n
- Deformaci\u00f3n permanente por compresi\u00f3n<\/li>\n\n\n\n
- Volatile content<\/li>\n\n\n\n
- Production cost<\/li>\n\n\n\n
- Delivery time<\/li>\n<\/ul>\n\n\n\n
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
Choosing LSR for Medical Components<\/h2>\n\n\n\n
Medical LSR selection begins with the intended device use and the nature and duration of patient contact.<\/p>\n\n\n\n
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
Define the Contact Type<\/h3>\n\n\n\n
Determine whether the finished product contacts:<\/p>\n\n\n\n
- \n
- Intact skin<\/li>\n\n\n\n
- Mucosal membranes<\/li>\n\n\n\n
- Compromised surfaces<\/li>\n\n\n\n
- Tissue<\/li>\n\n\n\n
- Blood<\/li>\n\n\n\n
- A fluid path that indirectly contacts the patient<\/li>\n\n\n\n
- No patient-contact area<\/li>\n<\/ul>\n\n\n\n
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
Review Available Biological-Support Information<\/h3>\n\n\n\n
A candidate medical LSR grade may be supported by:<\/p>\n\n\n\n
- \n
- Biocompatibility test information<\/li>\n\n\n\n
- Chemical-characterization information<\/li>\n\n\n\n
- Identificaci\u00f3n de materiales<\/li>\n\n\n\n
- Trazabilidad de los lotes<\/li>\n\n\n\n
- Processing recommendations<\/li>\n\n\n\n
- Supplier change-control policies<\/li>\n<\/ul>\n\n\n\n
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
The review should confirm:<\/p>\n\n\n\n
- \n
- The exact grade tested<\/li>\n\n\n\n
- Whether the same pigment was included<\/li>\n\n\n\n
- The curing and post-curing conditions<\/li>\n\n\n\n
- Whether testing represents the final component<\/li>\n\n\n\n
- Si los datos siguen estando actualizados<\/li>\n\n\n\n
- Whether additional device-specific evaluation is required<\/li>\n<\/ul>\n\n\n\n
Evaluate Sterilization Compatibility<\/h3>\n\n\n\n
Medical components may be exposed to:<\/p>\n\n\n\n
- \n
- \u00d3xido de etileno<\/li>\n\n\n\n
- Steam<\/li>\n\n\n\n
- Radiaci\u00f3n gamma<\/li>\n\n\n\n
- Radiaci\u00f3n por haz de electrones<\/li>\n\n\n\n
- X-ray processing<\/li>\n\n\n\n
- Per\u00f3xido de hidr\u00f3geno vaporizado<\/li>\n\n\n\n
- Repeated disinfection<\/li>\n<\/ul>\n\n\n\n
Sterilization can change:<\/p>\n\n\n\n
- \n
- Color<\/li>\n\n\n\n
- Transparencia<\/li>\n\n\n\n
- Dureza<\/li>\n\n\n\n
- Alargamiento<\/li>\n\n\n\n
- Resistencia al desgarro<\/li>\n\n\n\n
- Deformaci\u00f3n permanente por compresi\u00f3n<\/li>\n\n\n\n
- Estado de la superficie<\/li>\n\n\n\n
- Bond strength<\/li>\n\n\n\n
- Extractable substances<\/li>\n<\/ul>\n\n\n\n
Testing should use the intended sterilization process and the maximum expected number of cycles.<\/p>\n\n\n\n
Consider Cleanliness and Manufacturing Controls<\/h3>\n\n\n\n
Medical products may require controls for:<\/p>\n\n\n\n
- \n
- Cross-contamination<\/li>\n\n\n\n
- Trazabilidad de los materiales<\/li>\n\n\n\n
- Limpieza del molde<\/li>\n\n\n\n
- Postcurado<\/li>\n\n\n\n
- Particle levels<\/li>\n\n\n\n
- Handling<\/li>\n\n\n\n
- Washing<\/li>\n\n\n\n
- Embalaje<\/li>\n\n\n\n
- Registros de producci\u00f3n<\/li>\n\n\n\n
- Material changes<\/li>\n<\/ul>\n\n\n\n
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
Select Mechanical Properties for the Function<\/h3>\n\n\n\n
Medical applications may prioritize different properties:<\/p>\n\n\n\n
Medical component<\/th> Important LSR characteristics<\/th><\/tr> Valve or diaphragm<\/td> Controlled modulus, fatigue resistance, consistent dimensions<\/td><\/tr> Respiratory mask seal<\/td> Softness, tear resistance, skin comfort, low compression set<\/td><\/tr> Connector seal<\/td> Dimensional stability, sealing performance, traceability<\/td><\/tr> Sobremoldeo de cables m\u00e9dicos<\/td> Adhesion, flexibility, strain relief and tear resistance<\/td><\/tr> Transparent fluid component<\/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
Entre las aplicaciones m\u00e1s habituales se incluyen:<\/p>\n\n\n\n
- \n
- Juntas de conexi\u00f3n<\/li>\n\n\n\n
- Wire seals<\/li>\n\n\n\n
- Mat seals<\/li>\n\n\n\n
- Perimeter gaskets<\/li>\n\n\n\n
- Sensor seals<\/li>\n\n\n\n
- Cable-entry components<\/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
- Performance after thermal cycling<\/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
- Concentraci\u00f3n<\/li>\n\n\n\n
- Temperatura<\/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
- Seal displacement<\/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
- Atracci\u00f3n del polvo<\/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
- Pigments<\/li>\n\n\n\n
- Retardantes de llama<\/li>\n\n\n\n
- Mold-release additives<\/li>\n\n\n\n
- Humedad<\/li>\n\n\n\n
- Contaminaci\u00f3n superficial<\/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
- Pruebas de estanqueidad<\/li>\n\n\n\n
- Heat aging<\/li>\n\n\n\n
- Thermal cycling<\/li>\n\n\n\n
- Vibration testing<\/li>\n\n\n\n
- Exposici\u00f3n a l\u00edquidos<\/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
- Accesorios para la alimentaci\u00f3n del beb\u00e9<\/li>\n\n\n\n
- Utensilios de cocina<\/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
- Fundas protectoras<\/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
- Piel<\/li>\n\n\n\n
- A child\u2019s mouth<\/li>\n\n\n\n
- Electr\u00f3nica<\/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
- Difficult assembly<\/li>\n\n\n\n
- Adherencia superficial<\/li>\n\n\n\n
- Atracci\u00f3n del polvo<\/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
- Uniformidad del color<\/li>\n\n\n\n
- Light stability<\/li>\n\n\n\n
- Resistencia al calor<\/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
- Formulaci\u00f3n de materiales<\/li>\n\n\n\n
- Curado<\/li>\n\n\n\n
- Postcurado<\/li>\n\n\n\n
- Storage<\/li>\n\n\n\n
- Embalaje<\/li>\n\n\n\n
- Limpieza<\/li>\n\n\n\n
- Contaminaci\u00f3n<\/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
- Textura de la superficie<\/li>\n\n\n\n
- Flexibilidad<\/li>\n\n\n\n
- Product weight<\/li>\n\n\n\n
- Ease of cleaning<\/li>\n\n\n\n
- Stain resistance<\/li>\n\n\n\n
- Olor<\/li>\n\n\n\n
- Atracci\u00f3n del polvo<\/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
- Juntas de conexi\u00f3n<\/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
- Automotive connector seals<\/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
- Juntas industriales<\/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
- Exposici\u00f3n a l\u00edquidos<\/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
- Espesor de la pared<\/li>\n\n\n\n
- Temperatura del molde<\/li>\n\n\n\n
- Tiempo de curado<\/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
- Postcurado<\/li>\n\n\n\n
- Pigments<\/li>\n\n\n\n
- Demolding strain<\/li>\n\n\n\n
- Insert interaction<\/li>\n\n\n\n
- Esterilizaci\u00f3n<\/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
- \u00bfEs necesario un poscurado?<\/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
- Self-lubrication<\/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
- Baja deformaci\u00f3n permanente por compresi\u00f3n<\/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
- Postcurado<\/li>\n\n\n\n
- Insert material<\/li>\n\n\n\n
- M\u00e9todo de inspecci\u00f3n<\/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
Conclusi\u00f3n<\/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
- Funci\u00f3n del producto<\/li>\n\n\n\n
- Contact type<\/li>\n\n\n\n
- Temperatura<\/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
- Esterilizaci\u00f3n<\/li>\n\n\n\n
- Transparencia<\/li>\n\n\n\n
- Fricci\u00f3n superficial<\/li>\n\n\n\n
- Overmolding adhesion<\/li>\n\n\n\n
- Regulatory-support information<\/li>\n\n\n\n
- Moldeabilidad<\/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
Preguntas frecuentes<\/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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- Application compliance:<\/strong> What contact, safety and documentation requirements apply?<\/li>\n\n\n\n