Silicone Rubber Material Specifications

Exonic Polymers is a leading manufacturer of Silicone products. Silicone is a synthetic rubber elastomer where the principal raw material is silicon (Si), which is the second most abundant element in the earth's crust, following oxygen. Silicon does not occur as a single element in nature.

Silicone is manufactured in many forms including extruded profiles, sealants, adhesives, fluids, gels, and liquid rubber. Silicones play a key role in many industries including electronics industry, the transportation industry, foods, cosmetics, and the construction industry.

Silicone Extrusions Silicone Sealant & Adhesives

General Silicone Rubber Advantages & Benefits

  • Withstands high & low temperatures far better than organic rubber. (some sealants and adhesives are manufactured to handle up to 700 F)
  • 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 - 2.0

Temperature Range

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

High Temperature Usage: 400° F to 700° 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

Solar Panels

  • Protective Coatings
  • Anti-Glare Coatings
  • Junction Box Potting
  • Frame assembly Sealants / Adhesives
  • Conformal Coatings
  • Thermal & Electrical Grease
  • Rail Bonding

Electronics

  • Conformal Coatings
  • EMI / RFI Shielding
  • Surface Mount Adhesives
  • UV Cure
  • Heat Cure
  • RTV Cure
  • Thermally & Electrically Conductive
  • Gap Filler
  • Potting & Encapsulating

Construction

  • Commercial Glazing Sealants
  • Expansion Joints
  • Waterproofing Coatings
  • Fireproof Coatings
  • Anti-Corrosive Coatings