This Silicone - VMQ - MVQ O-Ring has a diameter of 809x4 mm and is Red in color. The hardness of this O-ring 809x4 - VMQ - MVQ - SIlicone - FDA - EC1935/2004 - 70 Shore A - Red - ORS151452 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 271978 are referred to as 151452 and have a DIN 3771 size of 809x4. 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.