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

Wacker ELASTOSIL RT 728 A B Two-Component Silicone Rubber

Wacker ELASTOSIL RT 728 A/B is a platinum-catalyzed two-component addition-cure silicone rubber offering excellent tear strength, low compression set, and outstanding thermal stability from –60 °C to +180 °C. Ideal for precision molding, gaskets, and sealing applications requiring high elasticity and biocompatibility per ISO 10993.
  • wacker elastosil rt 728 a b two component silicone rubber_3f63c239
  • wacker elastosil rt 728 a b two component silicone rubber_3f63c239

Features Of Wacker ELASTOSIL RT 728 A B Two-Component Silicone Rubber

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

  2. Low compression set and high elasticity for long-term sealing performance under dynamic stress.

  3. Platinum-catalyzed addition cure system offering precise, reproducible curing without by-products.

  4. Good adhesion to various substrates including metals, plastics, and glass after appropriate surface preparation.

  5. UL 94 V-0 rated for flame resistance, meeting stringent electrical insulation safety requirements.

Typical Applications Of Wacker ELASTOSIL RT 728 A B Two-Component Silicone Rubber

  1. High-reliability encapsulation of power electronics and LED modules.

  2. Sealing and potting of automotive sensors and control units exposed to harsh environments.

  3. Insulating components in renewable energy systems such as solar inverters and battery management units.

  4. Protective coatings for medical device housings requiring biocompatibility-compliant materials.

Specifications Of Wacker ELASTOSIL RT 728 A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-curing silicone rubber
Product FormTwo-component liquid system (Part A + Part B)
AppearanceTranslucent, low-viscosity liquids (Part A: colorless; Part B: pale yellow)
Mixing Ratio (A:B) by Weight1:1
Cure TypeRoom temperature or elevated temperature addition cure
Shore A Hardness (7 days, 23 °C)72 ± 3
Tensile Strength (7 days, 23 °C)10.5 ± 1.5 MPa
Elongation at Break (7 days, 23 °C)220 ± 30 %


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