This EPDM O-Ring is 156x3mm and in the color Black. The Hardness of this O-ring 156x3 - EPDM - Peroxide - FDA - EC1935/2004 - USP Class VI - 3A Sanitary - 70 Shore A - Black - ORS221544 is 70 Shore A.The alternative names of the compound are and they are mostly produced by Dow Chemical - ExxonMobil - and Lion Elastomers. The O-ring is commonly used in and has an operating temperature range from 150 ºC to -55 ºC. O-rings 6589687 are indicated as 221544 and have a DIN 3771 Size of 156x3. This item is equal to and has an FDA - EC1935/2004 - USP Class VI - 3A Sanitary Approval. The chemical name of this Oring is Ethylene Porpylene Diene Monomer.