Silicone LSR (Liquid Silicone Rubber)
Two-component platinum-catalyzed liquid silicone rubber processed by injection molding. Cures at 120–200°C in seconds (fast cycles). Outstanding temperature range -55°C to +200°C (intermittent 300°C). Biocompatible (USP Class VI, ISO 10993), optically clear grades available, excellent electrical insulation. Shore hardness 10A to 70A. Trade names: Silopren (Momentive), Elastosil (Wacker), Silastic (Dow). Used for baby bottle nipples, medical device seals, automotive gaskets, LED optics, baking molds, wearable devices and overmolded electronics.
Chemical composition comparison (wt%)
Side-by-side: Silicone LSR (Liquid Silicone Rubber) (COMPOSITION) (ASTM D1418) vs ASTM
| Element | Silicone LSR (Liquid Silicone Rubber) (COMPOSITION) | ASTM | Overlap |
|---|---|---|---|
| Polydimethylsiloxane (PDMS) | 70–90% | — | — |
| Silica Filler | 10–25% | — | — |
| Platinum Catalyst (ppm-level) | 0–0.1% | — | — |
Mechanical properties
Shore 40A Grade
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 7–10 | MPa |
| Elongation at Break | 400–700 | % |
| Tear Strength | 15–30 | kN/m |
| Compression Set (175°C/22h) | 10–25 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | 1.05–1.15 | g/cm³ |
| Continuous Use Temp | -55–200 | °C |
| Dielectric Strength | 20–25 | kV/mm |
| Water Absorption (24h) | 0.01–0.05 | % |
Related materials
EPDM (Ethylene Propylene Diene Rubber)
Ethylene propylene diene monomer rubber — THE outdoor/weather elastomer. Saturated backbone gives outstanding ozone, UV, and weathering resistance. Excellent resistance to steam, hot water, and polar solvents. NOT resistant to oils/fuels (opposite of NBR). Good electrical insulation. ρ 0.85-1.3 (lightest common rubber). Used for automotive door/window seals, roofing membranes, radiator hoses, HVAC gaskets, and pond liners.
Epoxy/Carbon Fiber (CFRP)
Carbon fiber reinforced epoxy — the benchmark structural composite material. Unidirectional ply: tensile strength 1500–2000 MPa, modulus 120–150 GPa at density 1.55 g/cm³ (5x stronger than steel at 1/5 the weight). Quasi-isotropic layup: UTS ~600 MPa, E ~50 GPa. Autoclave-cured prepreg (aerospace) or infusion/RTM (industrial). Used in aerospace primary structures (fuselage, wings), Formula 1 chassis, bicycle frames, wind turbine blades, pressure vessels (Type IV) and high-end sporting goods. Fiber types: T300, T700, T800, M40J, M55J.
FKM (Fluoroelastomer / Viton)
Fluoroelastomer — THE high-temperature and chemical-resistant rubber. Outstanding resistance to oils, fuels, acids, and solvents at temperatures up to 200°C (short-term 230°C). Fluorine content (64-70%) determines chemical resistance. Trade names: Viton (Chemours), Tecnoflon (Solvay), Dai-El (Daikin). 5-10x more expensive than NBR. Used for aerospace fuel seals, chemical process seals, automotive fuel injector O-rings, semiconductor processing, and any seal exposed to aggressive chemicals at high temperature.
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