This EPDM O-Ring has a diameter of 329.57x5.33 mm and is Black in color. The hardness of this O-ring 329.57x5.33 - EPDM - Peroxide - FDA - EC1935/2004 - 70 Shore A - Black - ORS50188 is 70 Shore A. Alternative names for the compound are , and it is commonly produced by Dow Chemical - ExxonMobil - and Lion Elastomers. The O-Ring is typically used in and has an operating temperature range from -50 ºC to 150 ºC. O-Rings 471905 are referred to as 50188 and have a DIN 3771 size of 329.57x5.33. This item is equivalent to and has an FDA 21 CFR 177.2600 - EC1935/2004 approval. The chemical name of this O-Ring is Ethylene propylene diene monomer.