This FKM - FPM - Viton O-Ring has a diameter of 19.45x1.78 mm and is Black in color. The hardness of this O-ring 19.45x1.78 - FKM - FPM - Viton - 80 Shore A - Black - ORS201831 is 80 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 -15 ºC to 200 ºC. O-Rings 157539 are referred to as 201831 and have a DIN 3771 size of 19.45x1.78. This item is equivalent to and has an approval. The chemical name of this O-Ring is Fluorocarbon Rubber.