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

Dow XIAMETER RBB-2420-40 Silicone Rubber

Dow XIAMETER RBB-2420-40 is a high-consistency silicone rubber (HCR) from Dow’s XIAMETER portfolio, offering excellent mechanical strength, thermal stability up to 200°C, and easy compression or injection molding. It cures rapidly with peroxide, delivers low compression set, and meets FDA/USP Class VI requirements for medical and food-contact applications.
  • dow xiameter rbb 2420 40 silicone rubber_67304ae1
  • dow xiameter rbb 2420 40 silicone rubber_67304ae1

Features Of Dow XIAMETER RBB-2420-40 Silicone Rubber

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

  2. Offers 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. Meets UL 94 HB flammability requirements and complies with FDA 21 CFR 177.2600 for indirect food contact.

  5. Consistent batch-to-batch reproducibility and optimized for automated dispensing and mixing systems.

Typical Applications Of Dow XIAMETER RBB-2420-40 Silicone Rubber

  1. Automotive engine gaskets and vibration-damping mounts.

  2. Industrial fluid-handling seals and diaphragms for pneumatic/hydraulic systems.

  3. Electrical insulation components and encapsulants for power electronics.

  4. Medical device housings and non-implantable elastomeric parts.

  5. Consumer appliance seals requiring durability under repeated thermal cycling.

Specifications Of Dow XIAMETER RBB-2420-40 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure silicone rubber
Product FormTwo-component liquid system (Part A: base; Part B: catalyst)
AppearancePart A: translucent off-white viscous liquid; Part B: translucent pale yellow liquid
Base Polymer Viscosity (25 °C, Part A)Approx. 40,000–60,000 cP
Cure SystemAddition cure (hydrosilylation)
Shore A Hardness (Cured, 7 days @ 23 °C)40 ± 2
Tensile Strength (ASTM D412)≥ 6.0 MPa
Elongation at Break (ASTM D412)≥ 350%


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