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

Wacker ELASTOSIL M 4643 Silicone Rubber

Wacker ELASTOSIL® M 4643 is a two-component addition-curing liquid silicone rubber offering excellent mechanical strength thermal stability and low compression set ideal for precision molding of medical devices and technical parts. It cures rapidly at room or elevated temperatures with outstanding flowability and minimal shrinkage ensuring high dimensional accuracy and biocompatibility per ISO 10993.
  • wacker elastosil m 4643 silicone rubber_6fa5ca06
  • wacker elastosil m 4643 silicone rubber_6fa5ca06

Features Of Wacker ELASTOSIL M 4643 Silicone Rubber

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

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

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

  4. Excellent electrical insulation properties compliant with UL 94 V-0 flammability rating.

  5. Ready-to-use two-component addition-cure system with precise 1:1 mixing ratio by weight or volume.

Typical Applications Of Wacker ELASTOSIL M 4643 Silicone Rubber

  1. Automotive engine compartment gaskets and vibration-damping mounts.

  2. Medical device housings requiring biocompatibility (ISO 10993-tested) and sterilization resistance.

  3. Industrial sensors and electronic encapsulation where dielectric integrity and thermal cycling resistance are critical.

  4. Aerospace sealing components exposed to extreme temperature gradients and low-pressure environments.

  5. Food-grade contact parts in processing equipment, compliant with FDA 21 CFR §177.2600.

Specifications Of Wacker ELASTOSIL M 4643 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component viscous liquid (Part A and Part B)
AppearanceTranslucent to slightly hazy, colorless to pale amber liquid
Mixing Ratio (by weight)1 : 1
Shore A Hardness (cured, 7 days @ 23 °C)45 ± 3
Tensile Strength (ASTM D412)≥ 7.0 MPa
Elongation at Break (ASTM D412)≥ 450 %
Cure SystemHeat-curable (e.g., 10 min @ 150 °C), inhibition-free


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