This FFKM - FFPM O-Ring has a diameter of 50.52x1.78 mm and is Black in color. The hardness of this O-ring 1.78x50.52 - FFKM - FFPM - F757ZLT - Low Temp (>-40°C) - 75 Shore A - Black - ORS86578 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 -40 ºC to 250 ºC. O-Rings 621907 are referred to as 86578 and have a DIN 3771 size of 50.52x1.78. This item is equivalent to and has an Low Temp (>-40°C) approval. The chemical name of this O-Ring is Perfluoroelastomer.