This FFKM - FFPM O-Ring has a diameter of 21 x 3 mm and is Black in color. The hardness of this O-ring 21x3 - FFKM - FFPM - F707Z94 - FDA - EC1935/2004 - USP Class VI - 3A Sanitary - 70 Shore A - Black - ORS220940 is 70. Alternative names for the compound are FFKM – FFPM, and it is commonly produced by . The O-Ring is typically used in and has an operating temperature range from -25 ºC to 270 ºC. O-Rings 657233 are referred to as 220940 and have a DIN 3771 size of 21 x 3. 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 Perfluoroelastomer.