This FKM - FPM - Viton O-Ring has a diameter of 254x10 mm and is Black in color. The hardness of this O-ring 254x10 - FEP-FKM - FDA - ORS164803 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 476420 are referred to as 164803 and have a DIN 3771 size of 254x10. This item is equivalent to and has an FDA approval. The chemical name of this O-Ring is Fluorocarbon Rubber.