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

Wacker ELASTOSIL RT 426 Silicone Rubber

Wacker ELASTOSIL® RT 426 is a two-component, addition-curing liquid silicone rubber offering excellent flowability, low viscosity, and outstanding mechanical properties after curing. Ideal for precision molding of medical devices, baby care items, and technical parts requiring biocompatibility (ISO 10993) and USP Class VI compliance. Fast cure at room temperature or accelerated with mild heat.
  • wacker elastosil rt 426 silicone rubber_cc65904c
  • wacker elastosil rt 426 silicone rubber_cc65904c

Features Of Wacker ELASTOSIL RT 426 Silicone Rubber

  1. Two-component, addition-cure liquid silicone rubber with excellent flowability and low viscosity for precise mold filling.

  2. High tear strength and outstanding elongation at break, ensuring durability in dynamic applications.

  3. Excellent thermal stability with continuous service temperature range from –60 °C to +180 °C.

  4. Biocompatibility compliant with ISO 10993–5 and USP Class VI, suitable for medical device manufacturing.

  5. Low compression set and superior resistance to aging, ozone, and UV exposure.

Typical Applications Of Wacker ELASTOSIL RT 426 Silicone Rubber

  1. Medical-grade seals and gaskets for diagnostic equipment and drug delivery systems.

  2. Soft-touch overmolding on plastic or metal substrates in healthcare and consumer electronics.

  3. Prototyping and low-volume production of anatomical models and surgical simulation components.

  4. Encapsulation of sensitive electronic sensors requiring electrical insulation and environmental protection.

  5. Custom molded parts for wearable health monitors and implantable device housings (non-implantable).

Specifications Of Wacker ELASTOSIL RT 426 Silicone Rubber

Chemical TypeAddition-cure liquid silicone rubber (LSR)
Product FormTwo-component system (Part A: base; Part B: platinum catalyst)
AppearanceTranslucent, low-viscosity liquid (Part A); colorless to pale yellow liquid (Part B)
Base PolymerPolymethylvinylsiloxane
Cure MechanismPt-catalyzed hydrosilylation
Shore A Hardness (7 days @ 23 °C)40 ± 2
Elongation at Break (ISO 37)≥ 550 %
Tensile Strength (ISO 37)≥ 7.0 MPa


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