This FFKM - FFPM O-Ring has a diameter of 2.57x1.78 mm and is Black in color. The hardness of this O-ring 2.57x1.78 - FFKM - FFPM - F757ZFD - FDA - USP Class VI - 75 Shore A - Black - ORS84469 is 75 Shore A. 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 -20 ºC to 270 ºC. O-Rings 604861 are referred to as 84469 and have a DIN 3771 size of 2.57x1.78. This item is equivalent to and has an FDA - USP Class VI approval. The chemical name of this O-Ring is Perfluoroelastomer.