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

Wacker SEMICOSIL 963 TC Silicone Rubber

Wacker SEMICOSIL 963 TC is a two-component, addition-cure liquid silicone rubber engineered for high thermal conductivity and excellent electrical insulation. It offers low viscosity, fast curing, and superior adhesion to metals and plastics—ideal for thermal interface materials in power electronics and EV battery modules.
  • wacker semicosil 963 tc silicone rubber_a8520b1c
  • wacker semicosil 963 tc silicone rubber_a8520b1c

Features Of Wacker SEMICOSIL 963 TC 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 flexibility enabling stress relief in bonded assemblies under thermal cycling.

  4. Platinum-catalyzed addition cure system ensuring low shrinkage, no by-products, and precise dimensional stability.

  5. Good adhesion to common substrates including aluminum, copper, ceramics, and epoxy PCBs without primers.

Typical Applications Of Wacker SEMICOSIL 963 TC Silicone Rubber

  1. Thermal interface material (TIM) between IGBT modules and heat sinks in electric vehicle inverters.

  2. Encapsulation and potting of high-power LED drivers and AC/DC converters.

  3. Die-attach and underfill for power semiconductor packages requiring long-term thermal reliability.

  4. Gap-filling thermal pads for battery management systems (BMS) and onboard chargers.

Specifications Of Wacker SEMICOSIL 963 TC Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-component paste (Part A: filler-rich base; Part B: catalyst)
AppearanceOff-white to light gray viscous paste (Part A); colorless to pale yellow paste (Part B)
Primary ApplicationsThermal interface materials, potting, encapsulation, gap filling
Key FeaturesHigh thermal conductivity, electrical insulation, low modulus, addition cure
Shore A Hardness (7 days @ 23°C)25–35
Density (23°C)Approx. 2.1 g/cm³
Operating Temperature Range−50°C to +200°C (continuous)


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