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

Dow DOWSIL SE 4420 Silicone Rubber

Dow DOWSIL SE 4420 Silicone Rubber is a two-part, addition-cure liquid silicone elastomer offering excellent flowability, low viscosity, and high tear strength. It cures rapidly at room or elevated temperatures, delivers outstanding biocompatibility, and meets ISO 10993 and USP Class VI standards—ideal for medical tubing, seals, and precision molded components.
  • dow dowsil se 4420 silicone rubber_cb75d3d8
  • dow dowsil se 4420 silicone rubber_cb75d3d8

Features Of Dow DOWSIL SE 4420 Silicone Rubber

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

  2. Fast room-temperature vulcanization (RTV) with low compression set and superior rebound resilience.

  3. Excellent adhesion to common substrates including metals, plastics, and painted surfaces without primer.

  4. Outstanding resistance to UV, ozone, and extreme temperatures (–55 °C to +200 °C continuous).

  5. Low volatility and compliant with ISO 10993-5 for cytotoxicity, suitable for medical device assembly.

Typical Applications Of Dow DOWSIL SE 4420 Silicone Rubber

  1. Sealing and gasketing in automotive powertrain and lighting assemblies.

  2. Encapsulation and bonding of electronic sensors and control modules.

  3. Medical device component assembly requiring biocompatibility and cleanroom compatibility.

  4. Industrial appliance seals exposed to thermal cycling and environmental aging.

  5. Custom molded parts for HVAC systems requiring long-term elastomeric integrity.

Specifications Of Dow DOWSIL SE 4420 Silicone Rubber

Chemical TypeTwo-part addition-cure liquid silicone rubber (LSR)
Product FormTwo-component kit: Part A (base) and Part B (catalyst), supplied separately
AppearancePart A: Translucent viscous liquid; Part B: Clear to pale yellow liquid
Primary ApplicationsHigh-performance sealing, bonding, and encapsulation
Key FeaturesRTV cure, high tear strength, primerless adhesion, low compression set
BenefitsReduced assembly time, improved reliability under thermal stress, regulatory-ready formulation
Cure SystemPt-catalyzed hydrosilylation (addition cure)
Shelf Life12 months unopened at ≤25 °C (stored in original sealed containers)


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