This FFKM - FFPM O-Ring is 59.9x3.53mm and in the color White. The Hardness of this O-ring 59.9x3.53 - FFKM - FFPM - FDA - EC1935/2004 - USP Class VI - 70 Shore A - White - Kalrez® 6880 - ORS178822 (Equivilent) is 70 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 -20 ºC to 270 ºC. O-rings 556556 are indicated as 178822 and have a DIN 3771 Size of 59.9x3.53. This item is equal to Kalrez® 6880 - Kalrez® 6221 - Perlast® G74S and has an FDA - EC1935/2004 - USP Class VI - 3A Sanitary Standard Approval. The chemical name of this Oring is Perfluoroelastomer.