This EPDM O-Ring has a diameter of 63x5.3 mm and is Black in color. The hardness of this O-ring 63x5.3 - EPDM - Peroxide - FDA - EC1935/2004 - NSF 61 - 70 Shore A - Black - ORS172544 is 70. Alternative names for the compound are , and it is commonly produced by Keltan® | Nordel® | Vistalon® | Dutral® | Buna EP® | Mitsui EPT® | Kumho Polychem EP® | JSR EP® | Royalene®. The O-Ring is typically used in and has an operating temperature range from -50 ºC to 150 ºC. O-Rings 1303966 are referred to as 172544 and have a DIN 3771 size of 63x5.3. This item is equivalent to and has an FDA - EC1935/2004 - NSF 61 approval. The chemical name of this O-Ring is Ethyleen Propyleen Diheen Monomeer.