This FFKM - FFPM O-Ring is 274.2 x 5.7mm and in the color Black. The Hardness of this O-ring 274.2x5.7 - FFKM - FFPM - Kalrez 6375 - 75 Shore A - Black - ORS177261 (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 -25 ºC to 270 ºC. O-rings 536971 are indicated as 177261 and have a DIN 3771 Size of 274.2 x 5.7. This item is equal to Dupont Kalrez 6375, Freudenberg Simriz 495, Greene Tweed Chemraz 605, Parker Parafluor V8910-75, PPE Perlast G80A, Trellebrog Isolast 9440 and has an None Approval. The chemical name of this Oring is Perfluoroelastomer.