This Silicone - VMQ - MVQ O-Ring has a diameter of 15.6x1.78 mm and is Red in color. The hardness of this O-ring 15.6x1.78 - VMQ - MVQ - Silicone - FDA - EC1935/2004 - USP Class VI - 3A Sanitary - 70 Shore A - Red - ORS223583 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 -55 ºC to 200 ºC. O-Rings 6591706 are referred to as 223583 and have a DIN 3771 size of 15.6x1.78. This item is equivalent to and has an FDA - EC1935/2004 - USP Class VI - 3A Sanitary approval. The chemical name of this O-Ring is Vilnyl Methyl Silicone.