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

Dow SILASTIC LS-63U Fluorosilicone Rubber

Dow SILASTIC LS-63U Fluorosilicone Rubber is a high-performance, platinum-cured elastomer offering exceptional resistance to fuels, oils, and extreme temperatures (–65°C to 200°C). It combines silicone flexibility with fluorocarbon chemical stability, ideal for aerospace, automotive, and oilfield sealing applications requiring long-term reliability under harsh conditions.
  • dow silastic ls 63u fluorosilicone rubber_77746cda
  • dow silastic ls 63u fluorosilicone rubber_77746cda

Features Of Dow SILASTIC LS-63U Fluorosilicone Rubber

  1. Excellent resistance to fuels, lubricants, and aggressive hydrocarbon-based fluids across wide temperature ranges.

  2. Outstanding low-temperature flexibility with continuous service capability down to –65 °C (–85 °F).

  3. Superior compression set resistance, maintaining sealing integrity after prolonged thermal and mechanical stress.

  4. Good electrical insulation properties stable over time and under environmental exposure.

  5. Processable via standard high-temperature vulcanization (HTV) techniques including extrusion, calendering, and compression molding.

Typical Applications Of Dow SILASTIC LS-63U Fluorosilicone Rubber

  1. Aerospace fuel system seals and gaskets exposed to jet fuels and synthetic lubricants.

  2. Automotive under-hood components requiring resistance to engine oils and transmission fluids.

  3. Oil & gas downhole elastomeric parts operating in sour gas (H₂S) and aromatic-rich environments.

  4. Defense-grade electronic enclosures and connector seals demanding wide-temperature reliability.

  5. Specialty industrial hoses and diaphragms handling aggressive solvents and chemical vapors.

Specifications Of Dow SILASTIC LS-63U Fluorosilicone Rubber

Chemical TypeFluorosilicone elastomer (FVMQ)
Product FormHigh-consistency gum stock (uncured)
AppearanceOpaque, light amber to tan colored compound
Primary ApplicationsStatic and dynamic seals, gaskets, and molded components
Key FeaturesFuel/oil resistance, low-temperature flexibility, compression set resistance
Processing MethodHigh-temperature vulcanization (HTV)
Curing SystemPeroxide-curable
Shelf Life (unopened, 25 °C)12 months from date of manufacture


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