Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Wacker ELASTOSIL N291 Silicone Rubber

Wacker ELASTOSIL® N291 is a platinum-cured liquid silicone rubber (LSR) offering excellent mechanical strength thermal stability and biocompatibility. Ideal for medical devices automotive seals and precision molded parts it features low viscosity fast cure and outstanding dimensional stability. Compliant with ISO 10993 and USP Class VI standards this high-performance LSR ensures reliability in demanding applications across healthcare and industrial sectors.
  • wacker elastosil n291 silicone rubber_31e952f0
  • wacker elastosil n291 silicone rubber_31e952f0

Features Of Wacker ELASTOSIL N291 Silicone Rubber

  1. High tear strength and excellent elongation at break for demanding dynamic applications.

  2. Outstanding thermal stability with long-term serviceability from –60 °C to +200 °C.

  3. Low compression set ensuring reliable sealing performance over extended periods.

  4. Good electrical insulation properties suitable for electronic encapsulation and potting.

  5. Platinum-catalyzed, addition-cure chemistry enabling precise, reproducible vulcanization without by-products.

Typical Applications Of Wacker ELASTOSIL N291 Silicone Rubber

  1. Seals and gaskets for automotive powertrain and under-hood components.

  2. Flexible insulating parts in consumer electronics and LED lighting housings.

  3. Medical device components requiring biocompatibility (ISO 10993-compliant when processed per specification).

  4. Industrial vibration dampers and resilient mounts exposed to elevated temperatures.

  5. Precision molded parts for aerospace sensors and instrumentation enclosures.

Specifications Of Wacker ELASTOSIL N291 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component system (Part A: base; Part B: catalyst)
Appearance (Uncured)Translucent, low-viscosity liquid
Shore A Hardness (Cured, 7 days @ 23 °C)28 ± 2
Tensile Strength (Cured)5.0–6.5 MPa
Elongation at Break (Cured)450–550 %
Compression Set (70 h @ 150 °C, ASTM D395 B)≤ 15 %
Thermal Stability Range–60 °C to +200 °C (continuous)


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