This EPDM O-Ring has a diameter of 50x4.5 mm and is Black in color. The hardness of this O-ring 50x4.5 - EPDM - 70 Shore A - Black - Peroxide - FDA - EC1935/2004 - NSF 61- ORS198978 is 70 Shore A. Alternative names for the compound are , and it is commonly produced by Dow Chemical - ExxonMobil - and Lion Elastomer. The O-Ring is typically used in and has an operating temperature range from -55 ºC to 150 ºC. O-Rings 1303034 are referred to as 198978 and have a DIN 3771 size of 50x4.5. This item is equivalent to and has an FDA - EC1935/2004 - NSF 61 approval. The chemical name of this O-Ring is Ethylene propylene diene monomer.