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

Wacker ELASTOSIL RT 778 Silicone Rubber

Wacker ELASTOSIL RT 778 is a two-component, addition-cure liquid silicone rubber offering excellent flowability, low viscosity, and high tear strength for precision molding of medical-grade elastomeric parts. It complies with ISO 10993 and USP Class VI standards.
  • wacker elastosil rt 778 silicone rubber_4a73e25a
  • wacker elastosil rt 778 silicone rubber_4a73e25a

Features Of Wacker ELASTOSIL RT 778 Silicone Rubber

  1. High tear strength and excellent elongation for demanding dynamic sealing applications.

  2. Fast room-temperature curing without the need for heat or humidity acceleration.

  3. Outstanding adhesion to common substrates including metals, glass, and plastics.

  4. Good resistance to weathering, UV radiation, and thermal aging (-50 °C to +180 °C continuous).

  5. Low compression set ensuring long-term sealing performance under sustained load.

Typical Applications Of Wacker ELASTOSIL RT 778 Silicone Rubber

  1. Automotive gaskets and vibration-damping mounts.

  2. Industrial enclosures requiring environmental protection (IP65/IP67).

  3. Electrical insulation and potting of sensors and control units.

  4. Sealing of HVAC components exposed to temperature cycling and moisture.

  5. Medical device housings requiring biocompatibility-compliant materials (ISO 10993 tested).

Specifications Of Wacker ELASTOSIL RT 778 Silicone Rubber

Chemical TypeRoom-Temperature Vulcanizing (RTV) Addition-Cure Silicone Rubber
Product FormTwo-component liquid system (Part A: base; Part B: catalyst)
AppearanceTranslucent to slightly opaque viscous liquid
Mix Ratio (by weight)10 : 1 (A:B)
Cure Time (23 °C / 50% RH)Surface dry in ~30 min; full cure in 24–72 h
Hardness (Shore A)~40–45 after 7 days
Tensile Strength~5.0–6.5 MPa
Elongation at Break~350–450%


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