This FKM - FPM - Viton O-Ring has a diameter of 18.8x1.8 mm and is Black in color. The hardness of this O-ring 18.8x1.8 - FKM - FPM - Viton - AED - 90 Shore A - Black - ORS168650 is 90. 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 -25 ºC to 230 ºC. O-Rings 970921 are referred to as 168650 and have a DIN 3771 size of 18.8x1.8. This item is equivalent to and has an AED approval. The chemical name of this O-Ring is Fluorocarbon Rubber.