This FFKM - FFPM O-Ring is 174.2x5.7mm and in the color Black. The Hardness of this O-ring 174.2x5.7 - FFKM - FFPM - High Temp - 75 Shore A - Black - Kalrez® 4079 - ORS75280 (Equivilent) is 75 Shore A.The alternative names of the compound are FFPM � Dupont Kalrez and they are mostly produced by Kalrez� - Simriz� - Chemraz� - Spectrum� - Triazinico� - Isolast� - Parofluor� - Fluorez� - Perlast� - Perfluor�. The O-ring is commonly used in and has an operating temperature range from -15 ºC to 330 ºC. O-rings 564448 are indicated as 75280 and have a DIN 3771 Size of 174.2x5.7. This item is equal to Dupont Kalrez 4079, Freudenberg Simriz 498, Greene Tweed Chemraz 615, PPE Perlast G75B, Trellebrog Isolast J8325 & Isolast J9876, and has an General Purpose (+330?C) Approval. The chemical name of this Oring is Perfluoroelastomer.