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

Wacker ELASTOSIL RT 646 A B Two-Component Silicone Rubber

Wacker ELASTOSIL® RT 646 A/B is a high-performance two-component addition-cure silicone rubber from Wacker’s ELASTOSIL® RT series. It offers excellent mechanical properties, low compression set, and outstanding thermal stability (–60 °C to +180 °C). Ideal for precision molding, gaskets, and sealing applications requiring food-contact compliance (FDA/EC1935) and biocompatibility.
  • wacker elastosil rt 646 a b two component silicone rubber_8bd59490
  • wacker elastosil rt 646 a b two component silicone rubber_8bd59490

Features Of Wacker ELASTOSIL RT 646 A B Two-Component Silicone Rubber

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

  2. Fast room-temperature vulcanization (RTV) without requiring heat curing, enabling efficient production cycles.

  3. Outstanding electrical insulation properties and low dielectric loss across wide frequency and temperature ranges.

  4. High elongation at break (>200 %) combined with good tensile strength for reliable sealing and cushioning performance.

  5. Low viscosity before mixing ensures easy dispensing, precise metering, and excellent air release during degassing.

Typical Applications Of Wacker ELASTOSIL RT 646 A B Two-Component Silicone Rubber

  1. Encapsulation and potting of electronic components, including power modules and LED drivers.

  2. Manufacturing of precision silicone molds for polyurethane, epoxy, and plaster casting.

  3. Sealing and gasketing in automotive sensor housings and under-hood electronics.

  4. Production of medical device components requiring biocompatibility (ISO 10993-compliant when fully cured).

  5. Protective coatings for high-voltage insulators and renewable energy system interfaces.

Specifications Of Wacker ELASTOSIL RT 646 A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component liquid system (Part A: base; Part B: catalyst)
Appearance (Mixed)Translucent, low-viscosity paste
Mixing Ratio (A:B)1:1 by weight
Cure Time (23 °C)≈2–4 hours to handling strength; full cure in 24 hours
Hardness (Shore A, cured)65 ± 3
Density (g/cm³, cured)1.12–1.16
ComplianceMeets RoHS Directive 2011/65/EU; REACH SVHC-free


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