Ethylene Propylene Diene Monomer

EPR also called EPDM is an Excellent General purpose rubber.  Excellent resistance to heat, cold, ozone, and ultraviolet light.  This makes an excellent material for outdoor applications.  Also has excellent chemical resistance. Excellent electrical and dynamic properties. 

Not oil resistant.  Tensile strength of 800 PSI. Durometer 60 +/-5.  
Temperature range: -20F to 220F.