Red Sheet is a blend of SBR (Styrene Butadiene Rubber) and other natural rubbers. Red sheet rubber is a cost effective rubber sheet and is not recommended for oil and ozone-resistant applications. It conforms easily to uneven flange surfaces and is an appealing product for the cost conscious industrial consumer. Red sheet has a 65-75 durometer range making it a harder, denser and more abrasion resistant rubber sheet. Often used in the plumbing trade for shower floor pan underlayment.