Liquid Silicone Rubber / LSR

Liquid Silicone Rubber(LSR)

Liquid Silicone Rubber(LSRs) are low viscosity and high purity elastomers with two-part catalyzed silicone specifically designed for liquid injection molding. Each elastomer is supplied in a two-part kit (Part A and Part B), equal portions (by weight) of which must be thoroughly blended together prior to use. When blended and cured as indicated, the resulting elastomer consists of cross-linked dimethyl and methyl-vinyl siloxane copolymers and reinforcing silica.

Cure system

Liquid Silicone Rubber(LSRs) are platinum-catalyzed, addition-cure products. This means no by-products and no release of substances that could impair odor or taste. And curing times are fast, too.

Other Common Variations

  • Liquid Silicone Rubber are noted for their high transparency and excellent mechanical and electrical properties.
  • Liquid Silicone Rubber applications are numerous, including the automotive, aerospace, appliance, medical, electrical and consumer industries.
  • Liquid Silicone Rubber can be formulated with only "white list " ingredients as specified in 21.CFR 177.2600 for use in applications where the elastomer will be in contact with food or beverages.
  • Liquid Silicone Rubber parts can be used in medical system which especially require compliance to USP CLASS VI.

General Information

ASTM D 1418 Designation
Standard Color(s)
ISO/DIN 1629 Designation
Hardness Range
20-80 Shore A
ASTM D2000 / SAE J 200 Codes
Relative Cost

Service Temperatures

Standard Low Temperature
-55°C / -67°F
Special Compound Low Temperature
Standard High Temperature
230°C / 446°F
Special Compound High Temperature

Performs Well In...

  • Engine and transmission oil (mineral oils)
  • Diluted salt solution
  • Moderate water
  • Dry heat
  • Ozone, weather resistance

Doesn’t Perform Well In...

  • Concentrated acids and alkalis
  • Steam over 120°C
  • Petroleum oils and fuel
  • Ketones