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

Wacker SEMICOSIL 963 TC A B Two-Component Silicone Rubber

Wacker SEMICOSIL 963 TC A/B is a two-component addition-curing silicone rubber offering excellent thermal conductivity, electrical insulation, and low compression set. Designed for potting, encapsulation, and thermal interface applications in electronics and power modules. It cures at room temperature or accelerated heat cure with precise 1:1 mixing ratio and long working life.
  • wacker semicosil 963 tc a b two component silicone rubber_53ce766b
  • wacker semicosil 963 tc a b two component silicone rubber_53ce766b

Features Of Wacker SEMICOSIL 963 TC A B Two-Component Silicone Rubber

  1. High thermal conductivity (≥1.5 W/m·K) for efficient heat dissipation in power electronics.

  2. Excellent electrical insulation properties with volume resistivity >1×10¹⁴ Ω·cm.

  3. Low modulus and high elasticity enable stress relief and long-term reliability under thermal cycling.

  4. Platinum-catalyzed addition cure system ensures precise stoichiometric mixing and minimal by-products.

  5. UL 94 V-0 rated flame retardancy without halogen additives, meeting stringent safety standards.

Typical Applications Of Wacker SEMICOSIL 963 TC A B Two-Component Silicone Rubber

  1. Thermal interface material (TIM) for IGBT modules and power semiconductor packages.

  2. Encapsulation and potting of automotive EV inverters and on-board chargers.

  3. Gap-filling pads and dispensable thermal gels in server power supplies and 5G base station equipment.

  4. Die-attach and underfill applications in high-power LED assemblies.

  5. Thermally conductive bonding layers for battery management systems (BMS) and energy storage units.

Specifications Of Wacker SEMICOSIL 963 TC A B Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-curing silicone rubber
Product FormTwo-component liquid system (Part A: base; Part B: catalyst)
AppearancePart A: translucent gray liquid; Part B: translucent gray liquid
Mixing Ratio (A:B)1:1 by weight
Cure Temperature Range25–150 °C (room temperature cure possible with extended time)
Shore A Hardness (7 days @ 23°C)55 ± 5
Thermal Conductivity1.5 W/m·K (ASTM D5470)
Density2.0 g/cm³ (ISO 1183)


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