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

Wacker ELASTOSIL RT 778 Two-Component Silicone Rubber

Wacker ELASTOSIL RT 778 is a two-component addition-curing silicone rubber offering excellent tear strength, low compression set, and outstanding thermal stability. Ideal for precision molding of seals, gaskets, and medical components, it cures rapidly at room temperature with precise 1:1 mixing ratio and minimal shrinkage.
  • wacker elastosil rt 778 two component silicone rubber_6b7cfe05
  • wacker elastosil rt 778 two component silicone rubber_6b7cfe05

Features Of Wacker ELASTOSIL RT 778 Two-Component Silicone Rubber

  1. Excellent tear resistance and high elongation at break for demanding mechanical performance.

  2. Fast room-temperature curing (RTV-2) without the need for heat or pressure.

  3. Low viscosity before mixing enables easy dispensing, degassing, and mold filling.

  4. Good adhesion to various substrates including metals, plastics, and glass—without primers in many cases.

  5. Outstanding thermal stability and long-term aging resistance from –60 °C to +180 °C.

Typical Applications Of Wacker ELASTOSIL RT 778 Two-Component Silicone Rubber

  1. Prototyping and low-volume production of functional elastomeric parts via casting.

  2. Manufacturing of soft-touch grips, seals, and gaskets for industrial equipment.

  3. Encapsulation and potting of sensitive electronic components requiring electrical insulation.

  4. Production of anatomical models and medical training devices compliant with ISO 10993 biocompatibility screening.

Specifications Of Wacker ELASTOSIL RT 778 Two-Component Silicone Rubber

Chemical TypePlatinum-cured addition-cure silicone rubber
Product FormTwo-component liquid system (Part A + Part B)
AppearanceTransparent to translucent viscous liquids
Mixing Ratio (by weight)1:1 (A:B)
Cure Time (23 °C / 50 % RH)~24 hours to full cure; surface tack-free in ~4–6 hours
Shore A Hardness (7 days, 23 °C)75 ± 3
Elongation at Break (ISO 37)≥ 350 %
Tensile Strength (ISO 37)≥ 8.0 MPa


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