This FFKM - FFPM O-Ring has a diameter of 7.8 x 1.9 mm and is Black in color. The hardness of this O-ring 7.8x1.9 - FFKM - FFPM - F757Z75 - High Temp. (+340°C) - 75 Shore A - Black - ORS219919 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 592525 are referred to as 219919 and have a DIN 3771 size of 7.8 x 1.9. This item is equivalent to and has an Hoge Temp. (+340°C) approval. The chemical name of this O-Ring is Perfluorcarbonrubber / Perfluoroelastomeer.