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

Wacker ELASTOSIL M 4643 A B Two-Component Silicone Rubber

Wacker ELASTOSIL® M 4643 A/B is a high-performance two-component addition-cure liquid silicone rubber offering excellent mechanical strength, thermal stability up to 180°C, low compression set, and outstanding demolding behavior. Ideal for precision casting, medical device molding, and industrial prototypes requiring biocompatibility and reproducible accuracy.
  • wacker elastosil m 4643 a b two component silicone rubber_54ff2bab
  • wacker elastosil m 4643 a b two component silicone rubber_54ff2bab

Features Of Wacker ELASTOSIL M 4643 A B Two-Component Silicone Rubber

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

  2. Fast room-temperature vulcanization (RTV) with balanced pot life and cure speed for efficient production.

  3. Outstanding thermal stability across a wide service temperature range (–50 °C to +180 °C).

  4. Low compression set, ensuring long-term sealing integrity and shape retention under continuous load.

  5. Excellent electrical insulation properties and resistance to UV, ozone, and weathering.

Typical Applications Of Wacker ELASTOSIL M 4643 A B Two-Component Silicone Rubber

  1. Automotive gaskets and dynamic seals for engine, transmission, and HVAC systems.

  2. Industrial encapsulation and potting of sensitive electronic components and sensors.

  3. Medical device housings and non-implantable elastomeric parts requiring biocompatibility support (ISO 10993 tested).

  4. Food-contact compliant seals and gaskets in processing equipment (FDA 21 CFR 177.2600 compliant).

Specifications Of Wacker ELASTOSIL M 4643 A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component (A + B) liquid system, supplied separately
AppearanceComponent A: translucent viscous liquid; Component B: translucent viscous liquid with catalyst
Mixing Ratio (A:B)1:1 by weight
Cure MechanismRoom-temperature vulcanization (RTV), accelerated by heat
Shore A Hardness (cured)40 ± 3
Primary ApplicationsSealing, gasketing, encapsulation, and prototyping
Key FeaturesLow viscosity, self-adhesive to many substrates, no by-products during cure


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