SBR

DESCRIPTION
Styrene-Butadiene rubber is much like natural rubber in many of its properties and is one of the lowest cost and highest volume elastomers available. Although its physical properties are somewhat less than natural rubber, SBR is tougher and slightly more resistant to heat and flex cracking. Much of its usage is in tire treads especially blended with other polymers. It can readily be substituted for natural rubber in many applications, thereby achieving significant cost savings. SBR is sometimes referred to as "GR-S" or Government Rubber-Styrene, as its development began as a wartime emergency, necessitated by an interrupted supply of natural rubber. SBR is actually a generic term covering a wide vareity of synthetic rubbers differing not only in the styrene-butadiene ratio, but also in the type of ploymerization by which they are made.
COMPOSITION
Low density copolymer of styrene and butadiene

PHYSICAL PROPERTIES* Excellent Good Fair Poor
Abrasion resistance      
Compression Set      
Elongation      
Flame resistance      
Gas permeability      
Low temperature flexibility      
Tear resistance      
Tensile strength      

CHEMICAL RESISTANCE* Excellent Good Fair Poor
Acetone      
Air    
Alcohols      

Diester oils                        

     
Glycol      
Mineral oil      
Oxidation      
Ozone      
Silicone Fluids    
Steam      
Water    
Weather      

OPERATING TEMPERATURE
-50 to 225 °F

*Excellent, good, fair and poor are intended to serve as general guidelines only. Actual testing in the application environment is always recommended.