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

Dow SILASTIC LS-4960 Fluorosilicone Rubber

Dow SILASTIC LS-4960 is a high-performance fluorosilicone rubber from Dow’s SILASTIC series, 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 4960 fluorosilicone rubber_8c26b5b8
  • dow silastic ls 4960 fluorosilicone rubber_8c26b5b8

Features Of Dow SILASTIC LS-4960 Fluorosilicone Rubber

  1. Excellent resistance to fuels, lubricants, and aggressive hydrocarbon-based chemicals.

  2. Broad operating temperature range from –65 °C to +200 °C with retained elasticity.

  3. Low compression set for reliable sealing performance under prolonged thermal and mechanical stress.

  4. Good electrical insulation properties across wide temperature and humidity conditions.

  5. Processable via standard high-temperature vulcanization (HTV) silicone manufacturing methods.

Typical Applications Of Dow SILASTIC LS-4960 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 instrumentation seals subjected to sour gas and hydrocarbon exposure.

  4. Military-grade electronic enclosures requiring environmental sealing and flame-retardant compatibility.

  5. Industrial hydraulic systems operating with phosphate ester or aromatic-based fluids.

Specifications Of Dow SILASTIC LS-4960 Fluorosilicone Rubber

Chemical TypeFluorosilicone elastomer (FVMQ)
Product FormHigh-consistency gum stock (uncured compound)
AppearancePale amber to light brown translucent solid
Primary ApplicationsStatic and dynamic seals, gaskets, diaphragms, and vibration dampers
Key FeaturesFuel/oil resistance, wide temperature capability, low compression set
Processing MethodHigh-temperature vulcanization (HTV) with peroxide cure system
Cure SystemPeroxide-curable (requires post-cure for optimal properties)
Regulatory ComplianceMeets ASTM D1418 and ISO 1629 classification for FVMQ


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