This FFKM - FFPM - Kalrez O-Ring is mm and in the color Black. The Hardness of this O-ring 19x2.42 - FFKM - FFPM - AED - NORSOK M710 - High Temp - Kalrez 7090 - 90 Shore A - Black - ORS644525 (Equivalent) is 90 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 340 ºC. O-rings 644525 are indicated as 220638 and have a DIN 3771 Size of . This item is equal to and has an AED - NORSOK M710 - High Temp Approval. The chemical name of this Oring is Perfluoroelastomer.