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

Wacker ELASTOSIL RT 779 Silicone Rubber

Wacker ELASTOSIL® RT 779 is a two-component, addition-cure liquid silicone rubber offering excellent tear strength, low compression set, and outstanding thermal stability. Ideal for precision molding of medical devices, automotive seals, and consumer electronics parts. Features fast cure at room or elevated temperatures with minimal by-products. Complies with ISO 10993 and USP Class VI standards.
  • wacker elastosil rt 779 silicone rubber_7387abd1
  • wacker elastosil rt 779 silicone rubber_7387abd1

Features Of Wacker ELASTOSIL RT 779 Silicone Rubber

  1. High tear strength and excellent elongation for demanding mechanical performance.

  2. Outstanding thermal stability with continuous service temperature up to 180 °C.

  3. Low compression set ensuring long-term sealing integrity under sustained load.

  4. Excellent electrical insulation properties across wide temperature and humidity ranges.

  5. Good adhesion to various substrates including metals, plastics, and cured silicone elastomers.

Typical Applications Of Wacker ELASTOSIL RT 779 Silicone Rubber

  1. Dynamic and static seals in automotive powertrain and engine compartments.

  2. Insulating components for high-voltage electrical equipment and transformers.

  3. Gaskets and encapsulation materials in industrial control systems and sensors.

  4. Sealing profiles for HVAC systems requiring resistance to ozone and weathering.

  5. Medical device housings and components meeting ISO 10993 biocompatibility guidelines (when fully cured).

Specifications Of Wacker ELASTOSIL RT 779 Silicone Rubber

Chemical TypePlatinum-cured high-consistency silicone rubber (HCR)
Product FormUncured compound in sheet or slab form
AppearanceOpaque, uniform elastomeric sheet; color typically translucent white or custom-tinted
Hardness (Shore A, ASTM D2240)70 ± 3
Tensile Strength (ASTM D412)≥ 8.0 MPa
Elongation at Break (ASTM D412)≥ 350 %
Compression Set (22 h @ 150 °C, ASTM D395 B)≤ 25 %
Density (ASTM D792)1.15–1.19 g/cm³


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