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

Wacker ELASTOSIL M 4641 Silicone Rubber

Wacker ELASTOSIL® M 4641 is a two-component addition-curing liquid silicone rubber offering excellent flowability, low viscosity, and high tear strength. It cures rapidly at room or elevated temperatures with minimal shrinkage, delivering outstanding detail reproduction and biocompatibility—ideal for medical device molding, prototyping, and precision casting applications.
  • wacker elastosil m 4641 silicone rubber_a388590d
  • wacker elastosil m 4641 silicone rubber_a388590d

Features Of Wacker ELASTOSIL M 4641 Silicone Rubber

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

  2. Fast room-temperature vulcanization (RTV) with low shrinkage and minimal by-product formation.

  3. Outstanding thermal stability across a wide operating range (–60 °C to +200 °C).

  4. Excellent electrical insulation properties and resistance to UV, ozone, and weathering.

  5. Good adhesion to various substrates including metals, plastics, and glass without primer.

Typical Applications Of Wacker ELASTOSIL M 4641 Silicone Rubber

  1. Electrical encapsulation and potting of high-voltage components and power electronics.

  2. Sealing and gasketing in automotive engine compartments and under-hood assemblies.

  3. Protective coatings for sensors, LED modules, and outdoor electronic housings.

  4. Industrial bonding and sealing in HVAC systems and renewable energy equipment.

  5. Soft-touch overmolding and functional elastomeric parts in medical device housings.

Specifications Of Wacker ELASTOSIL M 4641 Silicone Rubber

Chemical TypeTwo-component addition-curing liquid silicone rubber (LSR)
Product FormViscous liquid (Part A: base; Part B: platinum catalyst)
AppearanceTranslucent to slightly hazy, low-viscosity liquid
Primary ApplicationsEncapsulation, potting, sealing, and protective coating
Key FeaturesRTV curing, low compression set, high dielectric strength
BenefitsNo corrosive by-products, excellent long-term aging stability
Cure SystemPt-catalyzed hydrosilylation (inhibition-free at ambient temperature)
Shore A Hardness (7 days, 23 °C)45 ± 3


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