This FFKM - FFPM O-Ring is 228.28x2.62mm and in the color Black. The Hardness of this O-ring 228.28x2.62 - FFKM - FFPM - Norsok M710 - AED - High Temp - 75 Shore A - Black - Kalrez® 7090 - ORS90297 (Equivilent) is 90 Shore A.The alternative names of the compound are FFPM – Dupont Kalrez and they are mostly produced by Chemraz® - Simriz® - Kalrez® - Spectrum - Triazinico - Isolast® - Parofluor® - Fluorez - Perlast® - HPSealing® - Perfluor® - Polymax. The O-ring is commonly used in and has an operating temperature range from -15 ºC to 340 ºC. O-rings 651421 are indicated as 90297 and have a DIN 3771 Size of 228.28x2.62. This item is equal to Dupont Kalrez 7090, Paraflour® V8588-90, Polymax P316B9AED and has an NORSOK M710 - AED - High Temperature (330ºC) Approval. The chemical name of this Oring is Perfluoroelastomer.