This FFKM - FFPM O-Ring has a diameter of 506.81x5.33 mm and is Black in color. The hardness of this O-ring 506.81x5.33 - FFKM - FFPM - F757ZFD - FDA - USP Class VI - 75 Shore A - Black - ORS85991 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 616463 are referred to as 85991 and have a DIN 3771 size of 506.81x5.33. This item is equivalent to and has an FDA - USP Class VI approval. The chemical name of this O-Ring is Perfluoroelastomer.