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

Dow SILASTIC RTV-4251-S2 Silicone Rubber

Dow SILASTIC RTV-4251-S2 is a two-part, addition-cure liquid silicone rubber offering excellent flow, low viscosity, and high tear strength. Ideal for precision molding of medical devices and complex parts, it provides biocompatibility per ISO 10993, thermal stability, and rapid room-temperature cure with minimal shrinkage.
  • dow silastic rtv 4251 s2 silicone rubber_4bc12b78
  • dow silastic rtv 4251 s2 silicone rubber_4bc12b78

Features Of Dow SILASTIC RTV-4251-S2 Silicone Rubber

  1. Two-part, platinum-catalyzed addition-cure silicone rubber offering excellent dimensional stability and low shrinkage.

  2. High tear strength and elongation at break for durable, flexible molded parts.

  3. UL 94 V-0 flammability rating for enhanced safety in regulated applications.

  4. Low compression set and outstanding resistance to thermal aging (up to 200 °C continuous service).

  5. Good electrical insulation properties and stable dielectric performance over wide temperature and frequency ranges.

Typical Applications Of Dow SILASTIC RTV-4251-S2 Silicone Rubber

  1. Electrical encapsulation and potting of power electronics, transformers, and EV battery modules.

  2. Sealing and gasketing for automotive sensors, lighting assemblies, and under-hood components.

  3. Molded insulators and bushings for high-voltage infrastructure equipment.

  4. Soft-touch overmolding on medical device housings requiring biocompatibility support (ISO 10993-tested base polymers).

  5. Industrial automation components exposed to thermal cycling, vibration, and environmental stressors.

Specifications Of Dow SILASTIC RTV-4251-S2 Silicone Rubber

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-component (Part A + Part B), pourable liquid system
Appearance (Mixed)Translucent to slightly hazy viscous liquid
Primary ApplicationsEncapsulation, potting, gasketing, and precision molding
Key FeaturesLow viscosity, self-deairing capability, extended working life (pot life > 30 min at 25 °C)
BenefitsReduced void formation, high replication fidelity, minimal post-cure shrinkage
Curing SystemAddition cure (no by-products); inhibited at room temperature, accelerated with heat
Shore A Hardness (Cured)50 ± 3


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