This FKM - FPM - Viton O-Ring has a diameter of 186x3.5 mm and is Brown in color. The hardness of this O-ring 186x3.5 - FKM - FPM - Viton - 80 Shore A - Brown - ORS6544 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 -20 ºC to 205 ºC. O-Rings 18955 are referred to as 6544 and have a DIN 3771 size of 186x3.5. This item is equivalent to and has an None approval. The chemical name of this O-Ring is Fluorocarbon Rubber.