This FFKM - FFPM O-Ring has a diameter of 45 x 3 mm and is Black in color. The hardness of this O-ring 45x3 - FFKM - FFPM - F757Z75 - High Temp. (+340°C) - 75 Shore A - Black - ORS220038 is 75. Alternative names for the compound are FFKM – FFPM, and it is commonly produced by Kalrez® | Simriz® | Chemraz® | Perlast® | Isolast® | Parofluor®. The O-Ring is typically used in and has an operating temperature range from -15 ºC to 340 ºC. O-Rings 594179 are referred to as 220038 and have a DIN 3771 size of 45 x 3. This item is equivalent to and has an Hoge Temp. (+340°C) approval. The chemical name of this O-Ring is Perfluorcarbonrubber / Perfluoroelastomeer.