This FKM - FPM - Viton O-Ring has a diameter of 18 x 3.5 mm and is Brown in color. The hardness of this O-ring 18x3.5 - FKM - FPM - Viton - Conform FDA & EC1935/2004 - 75 Shore A - Brown - ORS224389 is 75 Shore A. Alternative names for the compound are , and it is commonly produced by Viton® - FKM. The O-Ring is typically used in and has an operating temperature range from -15 ºC to 200 ºC. O-Rings 6597638 are referred to as 224389 and have a DIN 3771 size of 18 x 3.5. This item is equivalent to and has an Conform FDA & EC1935/2004 approval. The chemical name of this O-Ring is Fluorocarbon Rubber.