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

Wacker ELASTOSIL RT 620 A B Two-Component Silicone Rubber

Wacker ELASTOSIL RT 620 A/B is a two-component addition-curing liquid silicone rubber offering excellent flowability, low viscosity, and high tear strength. Ideal for precision casting, prototyping, and medical device molding, it cures rapidly at room or elevated temperatures with minimal shrinkage and outstanding biocompatibility per ISO 10993.
  • wacker elastosil rt 620 a b two component silicone rubber_053079f9
  • wacker elastosil rt 620 a b two component silicone rubber_053079f9

Features Of Wacker ELASTOSIL RT 620 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 and dynamic gasket performance.

  3. Platinum-catalyzed addition curing system ensures precise, reproducible crosslinking without by-products.

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

  5. Easy two-component mixing (1:1 weight ratio) with extended pot life and rapid room-temperature or elevated-temperature cure.

Typical Applications Of Wacker ELASTOSIL RT 620 A B Two-Component Silicone Rubber

  1. Automotive engine and transmission seals, gaskets, and vibration-damping components.

  2. Industrial fluid-handling systems requiring resistance to oils, fuels, and brake fluids.

  3. Electrical and electronic encapsulation, potting, and insulating housings.

  4. Medical device components compliant with ISO 10993 biocompatibility standards (when processed under controlled conditions).

  5. Custom molded parts for HVAC, aerospace, and rail applications demanding dimensional stability and aging resistance.

Specifications Of Wacker ELASTOSIL RT 620 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: Translucent, low-viscosity liquid; Part B: Translucent, low-viscosity liquid
Mixing Ratio (by weight)1:1 (A:B)
Cure MechanismAddition reaction (hydrosilylation)
Shore A Hardness (Cured, 7 days @ 23 °C)62 ± 2
Tensile Strength (Cured)≥ 7.0 MPa
Elongation at Break (Cured)≥ 150 %


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