This Silicone - VMQ - MVQ O-Ring has a diameter of 55.2x2 mm and is Red in color. The hardness of this O-ring 55.2x2 - VMQ - MVQ - SIlicone - FDA - EC1935/2004 - 70 Shore A - Red - ORS152172 is 70 Shore A. Alternative names for the compound are Silicone Rubber - PVMQ, and it is commonly produced by Eriks - Wacker - Eastern Seals - and BlueStar. The O-Ring is typically used in and has an operating temperature range from -50 ºC to 210 ºC. O-Rings 279351 are referred to as 152172 and have a DIN 3771 size of 55.2x2. This item is equivalent to and has an FDA 21 CFR 177.2600 - EC1935/2004 approval. The chemical name of this O-Ring is Vilnyl Methyl Silicone.