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

Dow XIAMETER RBB-2120-55 Silicone Rubber

Dow XIAMETER® RBB-2120-55 is a high-consistency silicone rubber (HCR) from Dow’s XIAMETER® portfolio offering excellent mechanical strength thermal stability and compression set resistance. It cures rapidly via platinum-catalyzed addition reaction enabling efficient high-volume molding. Ideal for automotive medical and industrial applications requiring durability precision and biocompatibility compliance.
  • dow xiameter rbb 2120 55 silicone rubber_040addc1
  • dow xiameter rbb 2120 55 silicone rubber_040addc1

Features Of Dow XIAMETER RBB-2120-55 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 mechanical resilience for demanding sealing and dynamic gasket applications.

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

  5. Good adhesion to various substrates including metals and engineered plastics without primer under standard curing conditions.

Typical Applications Of Dow XIAMETER RBB-2120-55 Silicone Rubber

  1. Automotive engine and transmission gaskets requiring high-temperature resistance and oil compatibility.

  2. Industrial sealing components for pumps, valves, and compressors operating in harsh thermal environments.

  3. Electrical and electronic enclosures where flame retardancy, dielectric integrity, and long-term reliability are critical.

  4. Medical device housings and fluid-handling components meeting ISO 10993 biocompatibility requirements (when fully cured and validated).

Specifications Of Dow XIAMETER RBB-2120-55 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-part liquid system (Part A: base; Part B: catalyst)
AppearanceOpaque, off-white to light tan viscous paste (Part A); translucent amber liquid (Part B)
Shore A Hardness (ASTM D2240)55 ± 3
Tensile Strength (ASTM D412)≥ 7.0 MPa
Elongation at Break (ASTM D412)≥ 350 %
Curing SystemRoom-temperature or elevated-temperature platinum-catalyzed addition cure
Key FeaturesLow compression set, high thermal stability, excellent electrical insulation, good flow for complex mold filling


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