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

Wacker ELASTOSIL M 4440 Silicone Rubber

Wacker ELASTOSIL® M 4440 is a platinum-cured liquid silicone rubber (LSR) offering excellent flowability, low viscosity, and outstanding mechanical properties after curing. Ideal for precision injection molding of medical, automotive, and consumer parts, it complies with ISO 10993 and USP Class VI standards. The material delivers high tear strength, thermal stability, and biocompatibility—trusted for demanding elastomeric applications worldwide.
  • wacker elastosil m 4440 silicone rubber_676573f3
  • wacker elastosil m 4440 silicone rubber_676573f3

Features Of Wacker ELASTOSIL M 4440 Silicone Rubber

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

  2. Outstanding thermal stability with continuous service capability from –60 °C to +180 °C.

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

  4. Platinum-catalyzed addition cure system offering precise control, no by-products, and excellent shelf life.

  5. Good resistance to weathering, ozone, UV radiation, and aging in outdoor environments.

Typical Applications Of Wacker ELASTOSIL M 4440 Silicone Rubber

  1. Automotive gaskets and seals for engine compartments and under-hood components.

  2. Industrial fluid-handling seals exposed to hot oils, coolants, and brake fluids.

  3. Electrical insulation parts requiring high dielectric strength and tracking resistance.

  4. Food-contact compliant seals and gaskets (subject to FDA 21 CFR 177.2600 and EU 10/2011 compliance verification).

  5. Medical device components where biocompatibility and sterilization resistance (e.g., steam, gamma) are critical.

Specifications Of Wacker ELASTOSIL M 4440 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-curing silicone rubber
Product FormTwo-component liquid system (Part A: base, Part B: catalyst)
AppearanceTranslucent, low-viscosity liquid (Part A); colorless to pale yellow liquid (Part B)
Shore A Hardness (cured, 7 d @ 23 °C)40 ± 3
Tensile Strength (cured, 7 d @ 23 °C)≥ 7.5 MPa
Elongation at Break (cured, 7 d @ 23 °C)≥ 350 %
Compression Set (22 h @ 150 °C, ISO 815-1)≤ 25 %
Cure SystemAddition cure (hydrosilylation), inhibited at room temperature


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