This EPDM O-Ring has a diameter of 21.91x1.78 mm and is Black in color. The hardness of this O-ring 21.91x1.78 - EPDM - Peroxide - FDA - EC1935/2004 - 70 Shore A - Black - ORS172258 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 1300057 are referred to as 172258 and have a DIN 3771 size of 21.91x1.78. 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.