This FEP-FKM - FPM - Viton O-Ring has a diameter of 16.5x2.5 mm and is Black - Translucent in color. The hardness of this O-ring 16.5x2.5 - FEP-FKM - FPM - Viton - FDA - ORS112554 is Shore A. Alternative names for the compound are FEP - Viton® - FKM / FEP encapsulated 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 ºC to 205 ºC. O-Rings 6521588 are referred to as 112554 and have a DIN 3771 size of 16.5x2.5. This item is equivalent to and has an FDA approval. The chemical name of this O-Ring is Teflon® fluroropolymer - Viton.