Silicone Rubber Material Specifications

Exonic Polymers is a leading manufacturer of extruded custom Silicone Rubber profiles. Silicone is a synthetic rubber elastomer. It exhibits outstanding resistance to extreme temperatures, great tear strength, and good compression sets.

Silicone Rubber Advantages & Benefits

  • Withstands high & low temperatures far better than organic rubber
  • Good thermal stability
  • Repels water & forms tight seals
  • Excellent electrical insulation, no decline in insulation performance even when immersed in water, making it an ideal insulating material
  • Flexible at low temperatures, stiffens up at higher temperatures
  • Under ordinary pressure, contact with steam typically causes little or no deterioration
  • Flame retardant - Some products received UL94 V-0 certification according to the UL94 (USA) standards for flammability classification.
  • Unlike most organic elastomers such as EPDM and neoprene, the compression set of silicone rubber is consistent over a wide range of temperatures from -60° to +250°C. The selection of a proper curing agent and post-curing is particularly recommended when using silicone material to make molded products that require a low compression set.
  • Low chemical reactivity
  • Carbon black additive will also increase the silicone's electrical conductivity.

Silicone Rubber Properties

Common Name: Silicone

ASTM D2000 Classification: FC, FE, GE

Chemical Definition: Polysiloxane

Specific Gravity: 0.95 - 1.20

Temperature Range

Low Temperature Usage: -65° to -150° F

High Temperature Usage: 400° F to 550° F

Tensile Strength

Tensile Range: 200-1500 P.S.I. - Fair - Good

Elongation: 700% Maximum - Very Good - Excellent

Durometer (Hardness)

Range: 25-90 Shore A

Resilience/ Rebound: Good

Abrasion Resistance: Good - Poor - Fair

Tear Resistance: Poor - Fair

Compression Set: Fair - Good - Excellent

Additional Properties

Aging Weather: Excellent

Adhesion to Metals: Good

Solvent Resistance: Poor

Oil Resistance: Poor

Heat Resistance: Fair - Excellent

Flame Resistance: Good

Common Silicone Applications


  • Boiler seals
  • Industrial hose
  • O-rings

Wire & Cabling

  • Cable jackets
  • Jacketing in lead press cured mining cables
  • Jacketing in heavy-duty cables


  • Neoprene window seals
  • Custom window gaskets
  • Highway and bridge seals
  • Bridge bearing pads
  • Neoprene washers
  • Bridge stay-cable anchor components
  • Deviator pads
  • Neoprene O Ring
  • Elevator astragals