Darcoid EPDM (Ethylene Propylene) Material Compound Data Sheet #1131. Original test data stored in the Darcoid Compound Database. This material is available to run in our manufacturing partner plant in N America and Hardness Shore A (+/- 5) is 70. EPDM (Ethylene Propylene) meets NSF 51, NSF 61, FDA, USP CLASS VI, ISO 10993 certification.