This FFKM - FFPM O-Ring has a diameter of 257x4 mm and is Black in color. The hardness of this O-ring 257x4 - FFKM - FFPM - F758Z96 - General Purpose - High Temp (>330°C) - 75 Shore A - Black - ORS115503 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 -15 ºC to 330 ºC. O-Rings 577512 are referred to as 115503 and have a DIN 3771 size of 257x4. This item is equivalent to and has an General Purpose - High Temp (>330°C) approval. The chemical name of this O-Ring is Perfluoroelastomer.