This FFKM - FFPM O-Ring has a diameter of 37.5 x 3.5 mm and is Black in color. The hardness of this O-ring 37.5x3.5 - FFKM - FFPM - F909ZLT - AED - Norsok M710 - Low Temp (>-40°C) - 90 Shore A - Black - ORS177791 is 90 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 270 ºC. O-Rings 544339 are referred to as 177791 and have a DIN 3771 size of 37.5 x 3.5. This item is equivalent to and has an AED - Norsok M710 - Low Temp (>-40°C) approval. The chemical name of this O-Ring is Perfluoroelastomer.