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

Wacker ELASTOSIL M 4370 A B Two-Component Silicone Rubber

Wacker ELASTOSIL® M 4370 A/B is a platinum-cured, two-component addition-curing silicone rubber offering excellent mechanical strength, thermal stability up to 200°C, and outstanding transparency. Ideal for precision molding, medical devices, and optical applications due to low viscosity, long pot life, and biocompatibility per ISO 10993.
  • wacker elastosil m 4370 a b two component silicone rubber_639e89b4
  • wacker elastosil m 4370 a b two component silicone rubber_639e89b4

Features Of Wacker ELASTOSIL M 4370 A B Two-Component Silicone Rubber

  1. High tear strength and excellent elongation at break for demanding mechanical performance.

  2. Fast room-temperature curing (RTV-2) with precise 1:1 mixing ratio by volume or weight.

  3. Low viscosity before curing enables easy degassing and complete mold filling, even for intricate geometries.

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

  5. Good electrical insulation properties and UL 94 V-0 flammability rating (when cured).

Typical Applications Of Wacker ELASTOSIL M 4370 A B Two-Component Silicone Rubber

  1. Encapsulation and potting of electronic components, including sensors, connectors, and power modules.

  2. Manufacturing of precision silicone molds for polyurethane, epoxy, and low-melting-point alloys.

  3. Sealing and gasketing in automotive under-hood and EV battery module assemblies.

  4. Medical device components requiring biocompatibility per ISO 10993-5 and USP Class VI compliance.

Specifications Of Wacker ELASTOSIL M 4370 A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component liquid system (Part A and Part B)
Appearance (Uncured)Part A: Transparent, low-viscosity liquid; Part B: Transparent, low-viscosity liquid
Mixing Ratio1:1 by volume or by weight
Curing MechanismRoom-temperature vulcanization (RTV-2), platinum-catalyzed addition reaction
Shore A Hardness (Cured)40 ± 2
Tensile Strength (Cured)Approx. 5.5 MPa
Elongation at Break (Cured)Approx. 420 %


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