Styrene Butadiene

Trade Names:

• Too numerous to list.

ASTM D1418 Designation: SBR

ASTM D2000/SAE J200 Type, Class: AA, BA

Apple Compound Designation: SB

Standard Color: Black

Description: Also known as Buna S, or GR-S (Government Rubber-Styrene), Styrene Butadiene was the elastomer substituted for Natural Rubber during World War II. Compounded properties are similar to those of Natural Rubber.

Key Use(s): Sealing of automotive brake systems.

Temperature Range: Standard Compound: -50° to +212°F. (Dry Heat Only)

Hardness (Shore A): 40 to 90.

Features: The main use for Styrene Butadiene today is in the manufacture of automobile tires because it exhibits excellent resistance to brake fluids. SBR is still used in some brake applications.

Limitations: SBR is not recommended for exposure to petroleum oils, most hydrocarbons, strong acids, or ozone.

This material is seldom used in modern sealing applications. It has been replaced by better performing materials.