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What Are the Key Properties of Liquid Silicone Rubber (LSR)?

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What Are the Key Properties of Liquid Silicone Rubber (LSR)?

04/28/2026

What Makes LSR Different from Traditional Rubbers?

Liquid Silicone Rubber (LSR) is a platinum-cured elastomer with a unique molecular structure that gives it exceptional thermal stability and chemical resistance. Unlike solid rubbers, LSR starts as a low-viscosity liquid, allowing it to flow into complex mold geometries with ease. Its ability to remain flexible across a wide temperature range makes it ideal for demanding applications.

Why Is Thermal Stability Important for LSR Applications?

LSR maintains its physical properties from -60°C to over 200°C, making it suitable for environments with extreme temperature fluctuations. This stability ensures long-term performance in automotive under-the-hood components and medical devices that undergo repeated sterilization cycles without degrading or losing elasticity.

How Does LSR Resist Chemical Degradation?

Due to its inert silicon-oxygen backbone, LSR shows excellent resistance to ozone, UV radiation, and many chemicals including acids and bases. This makes it a preferred material for outdoor applications and industrial components exposed to harsh substances. Its non-reactivity also supports biocompatibility in medical uses.

What Mechanical Advantages Does LSR Offer?

LSR exhibits high tear strength, excellent elongation, and low compression set, meaning it returns to its original shape after deformation. These properties are crucial for sealing applications, gaskets, and flexible housings. Its low shrink rate during curing also contributes to tight tolerances and consistent part dimensions.