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

Wacker SEMICOSIL 989 1K Silicone Gel

Wacker SEMICOSIL 989 1K Silicone Gel is a platinum-cured, single-component silicone gel offering excellent thermal stability, low stress on delicate components, and outstanding electrical insulation. Ideal for LED encapsulation, sensor protection, and electronic potting, it cures at room temperature with moisture sensitivity controlled via sealed packaging.
  • wacker semicosil 989 1k silicone gel_db819ae1
  • wacker semicosil 989 1k silicone gel_db819ae1

Features Of Wacker SEMICOSIL 989 1K Silicone Gel

  1. One-component, platinum-catalyzed addition-cure silicone gel with ultra-low modulus for exceptional stress relief.

  2. Self-adhesive to common substrates including plastics, metals, and PCBs without primer.

  3. Excellent thermal stability from –60 °C to +200 °C with long-term aging resistance.

  4. Low viscosity before cure enables easy dispensing, needle dispensing, and conformal coverage of complex geometries.

  5. UL 94 V-0 rated for flame retardancy and compliant with RoHS and REACH regulations.

Typical Applications Of Wacker SEMICOSIL 989 1K Silicone Gel

  1. Underfill and stress-relief encapsulation for power electronics and IGBT modules.

  2. Thermal interface material (TIM) between heat sinks and high-power semiconductor devices.

  3. Protection of sensitive SMD components, sensors, and LED assemblies against mechanical shock and vibration.

  4. Conformal coating for automotive ECUs, battery management systems (BMS), and ADAS control units.

  5. Die attach and cavity fill in optoelectronics and medical device packaging.

Specifications Of Wacker SEMICOSIL 989 1K Silicone Gel

Chemical TypePlatinum-catalyzed addition-cure silicone gel
Product FormPaste (thixotropic, non-sag)
AppearanceTranslucent, off-white to light amber gel
Primary ApplicationsStress relief, underfill, thermal management, conformal protection
Key Features1K system, self-adhesive, low modulus, flame-retardant
Shore A Hardness (7 days, 23 °C)10–15
Density (23 °C)1.15–1.20 g/cm³
Storage Stability (unopened, 25 °C)≥6 months


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