This FKM - FPM - Viton O-Ring has a diameter of 55 x 4 mm and is Black in color. The hardness of this O-ring 55x4 - FKM - FPM - Viton - FDA - EC1935/2004 - USP Class VI - BAM - 70 Shore A - Black - ORS223315 is 70 Shore A. Alternative names for the compound are , and it is commonly produced by Viton® - Du Pont - 3M - Solvay - Daikin. The O-Ring is typically used in and has an operating temperature range from -25 ºC to 200 ºC. O-Rings 6591443 are referred to as 223315 and have a DIN 3771 size of 55 x 4. This item is equivalent to and has an FDA - EC1935/2004 - USP Class VI - BAM approval. The chemical name of this O-Ring is Fluorocarbon Rubber.