This FKM - FPM - Viton O-Ring has a diameter of 28x6 mm and is Black in color. The hardness of this O-ring 28x6 - FEP-FKM - FDA - ORS153570 is Shore A. Alternative names for the compound are Viton® - FKM, and it is commonly produced by Teflex FEP-O-SEAL®. The O-Ring is typically used in and has an operating temperature range from -20 ºC to 205 ºC. O-Rings 304135 are referred to as 153570 and have a DIN 3771 size of 28x6. This item is equivalent to and has an FDA approval. The chemical name of this O-Ring is Fluorocarbon Rubber.