This EPDM O-Ring has a diameter of 2.57x1.78 mm and is Black in color. The hardness of this O-ring 2.57x1,78 - EPDM - Peroxide - FDA - EC1935/2004 - USP Class VI - 3A Sanitary - 70 Shore A - Black - ORS221250 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 -55 ºC to 150 ºC. O-Rings 6589393 are referred to as 221250 and have a DIN 3771 size of 2.57x1.78. This item is equivalent to and has an FDA - EC1935/2004 - USP Class VI - 3A Sanitary approval. The chemical name of this O-Ring is Ethylene Porpylene Diene Monomer.