This FKM - FPM - Viton - GF / AED O-Ring has a diameter of 253.6x3.5 mm and is Black in color. The hardness of this O-ring 253.6x3.5 - FKM - FPM - Viton - GF / AED - 90 Shore A - Black - ORS170331 is 90 Shore A. Alternative names for the compound are Viton® - FKM, 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 -20 ºC to 230 ºC. O-Rings 999399 are referred to as 170331 and have a DIN 3771 size of 253.6x3.5. This item is equivalent to and has an GF / AED approval. The chemical name of this O-Ring is Fluorocarbon Rubber.