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

Wacker ELASTOSIL RT 402 Silicone Rubber

Wacker ELASTOSIL® RT 402 is a two-component, addition-curing liquid silicone rubber offering excellent mechanical strength, thermal stability up to 180°C, and low compression set. Ideal for precision molding of medical devices, seals, and automotive parts, it cures rapidly at room or elevated temperatures with outstanding flow and demolding properties.
  • wacker elastosil rt 402 silicone rubber_dbdbcecb
  • wacker elastosil rt 402 silicone rubber_dbdbcecb

Features Of Wacker ELASTOSIL RT 402 Silicone Rubber

  1. Two-component, addition-cure liquid silicone rubber with excellent flowability and low viscosity for precise mold filling.

  2. High tear strength and outstanding elongation at break, ensuring durability in dynamic sealing and flexible part applications.

  3. Excellent thermal stability with continuous service temperature range from –60 °C to +180 °C.

  4. Low compression set and superior resistance to aging, ozone, and UV radiation.

  5. Biocompatibility compliant with ISO 10993–5 and USP Class VI (upon proper post-cure), suitable for medical device prototyping.

Typical Applications Of Wacker ELASTOSIL RT 402 Silicone Rubber

  1. Medical device components including seals, gaskets, tubing connectors, and wearable sensor housings.

  2. Automotive under-hood seals, vibration dampers, and fluid-handling components exposed to extreme temperatures.

  3. Consumer electronics encapsulation and protective overmolding for buttons, wearables, and haptic interfaces.

  4. Industrial precision gaskets and soft-touch ergonomic grips requiring high tactile consistency and long-term resilience.

  5. Prototyping and low-volume production of flexible parts via vacuum casting or injection molding.

Specifications Of Wacker ELASTOSIL RT 402 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component (Part A: base; Part B: catalyst), supplied separately
AppearanceTranslucent, low-viscosity liquid (Part A); colorless to pale yellow liquid (Part B)
Mix Ratio (A:B) by Weight10:1
Cure SystemAddition cure (hydrosilylation), no by-products
Shore A Hardness (7 days, 23 °C)40 ± 2
Elongation at Break (ISO 37)≥ 500 %
Tensile Strength (ISO 37)≥ 6.5 MPa


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