Commercial grade Neoprene is a blend of Neoprene, nitrile and styrene-butadiene rubber (SBR.) It is used as shock absorbing, insulating, and gasketing material. It also serves as an excellent and durable separator between dissimilar metals to eliminate corrosion.
Neoprene is available in a variety of durometers (durometer refers to the hardness of the rubber.) Each durometer level also changes the tensile strength and elongations.
For the steel fabricator standard Neoprene is approximately 70 durometer. This provides a firm pad that can withstand significant pressure and remain durable in most environments with temperature ranges from -20 degrees Fahrenheit to 190 degrees Fahrenheit.