This FFKM - FFPM O-Ring is 3.8 x 1.9mm and in the color Black. The Hardness of this O-ring 3,8x1.9 - FFKM - FFPM - High Temp. - Kalrez 7075 - 75 Shore A - Black - ORS219902 (Equivalent) 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 340 ºC. O-rings 592308 are indicated as 219902 and have a DIN 3771 Size of 3.8 x 1.9. This item is equal to Dupont Kalrez 7075 and has an High Temperature Approval. The chemical name of this Oring is Perfluoroelastomer.