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

Dow SILASTIC SH 831 U Silicone Rubber

Dow SILASTIC SH 831 U is a high-strength, addition-cure liquid silicone rubber from Dow’s SILASTIC® portfolio. It offers excellent flow, low viscosity, and outstanding thermal stability. Ideal for precision molding of medical devices, seals, and gaskets. Cures rapidly at room or elevated temperatures with platinum catalyst. Meets ISO 10993 and USP Class VI biocompatibility standards.
  • dow silastic sh 831 u silicone rubber_3b0fccd0
  • dow silastic sh 831 u silicone rubber_3b0fccd0

Features Of Dow SILASTIC SH 831 U Silicone Rubber

  1. High-consistency, two-part addition-cure silicone rubber with excellent processability in compression and transfer molding.

  2. Outstanding thermal stability and long-term performance across a wide temperature range (–60 °C to +200 °C).

  3. Low compression set and superior resilience for dynamic sealing and gasketing applications.

  4. Excellent electrical insulation properties and UL 94 V-0 flammability rating (when compounded appropriately).

  5. Good adhesion to various substrates including metals, plastics, and coated surfaces without primers in many cases.

Typical Applications Of Dow SILASTIC SH 831 U Silicone Rubber

  1. Automotive under-hood seals, gaskets, and vibration-damping components.

  2. Electrical and electronic encapsulation, potting, and insulating housings.

  3. Medical device components requiring biocompatibility (ISO 10993-compliant formulations available upon request).

  4. Industrial fluid-handling seals and diaphragms exposed to oils, fuels, and ozone.

  5. Appliance gaskets for cooktops, ovens, and HVAC systems demanding high-temperature resistance.

Specifications Of Dow SILASTIC SH 831 U Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-part liquid system (Part A: base; Part B: catalyst)
Appearance (Uncured)Opaque, viscous paste (Part A); translucent, low-viscosity liquid (Part B)
Shore A Hardness (Cured, 7 days @ 150 °C)60 ± 3
Tensile Strength (Cured, ASTM D412)≥ 7.0 MPa
Elongation at Break (Cured, ASTM D412)≥ 350 %
Volume Resistivity (Cured, ASTM D257)≥ 1 × 10¹⁴ Ω·cm
Operating Temperature Range–60 °C to +200 °C (continuous)


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