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

Wacker ELASTOSIL RT 779 Two-Component Silicone Rubber

Wacker ELASTOSIL® RT 779 is a two-component addition-curing silicone rubber offering excellent tear strength, low compression set, and outstanding thermal stability. Ideal for precision molding of medical devices, seals, and technical parts. Features fast demolding, high biocompatibility (ISO 10993), and consistent reproducibility. Supplied as Part A (base) and Part B (catalyst) with 1:1 mixing ratio.
  • wacker elastosil rt 779 two component silicone rubber_78c8dfaa
  • wacker elastosil rt 779 two component silicone rubber_78c8dfaa

Features Of Wacker ELASTOSIL RT 779 Two-Component Silicone Rubber

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

  2. Low viscosity before curing enables easy mixing, degassing, and mold filling.

  3. Platinum-catalyzed addition cure system ensures precise control, minimal shrinkage, and no by-products.

  4. Good high-temperature resistance with long-term stability up to 180 °C.

  5. Biocompatibility tested per ISO 10993-5 and USP Class VI, suitable for medical device prototyping.

Typical Applications Of Wacker ELASTOSIL RT 779 Two-Component Silicone Rubber

  1. Medical device prototypes including wearable sensors and anatomical models.

  2. Soft-touch grips and ergonomic components for handheld industrial tools.

  3. Encapsulation of sensitive electronics requiring thermal and electrical insulation.

  4. Functional prototypes in automotive interiors, such as seals and gaskets.

Specifications Of Wacker ELASTOSIL RT 779 Two-Component Silicone Rubber

Chemical TypePlatinum-catalyzed addition-curing silicone rubber
Product FormTwo-component liquid system (Part A + Part B)
AppearanceTranslucent, low-viscosity liquids
Mixing Ratio (A:B)1:1 by weight
Cure Time (23 °C)Approx. 24 hours to full cure
Shore A Hardness (7 days, 23 °C)70 ± 3
Tensile Strength (ISO 37)8.5 MPa
Elongation at Break (ISO 37)220 %


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