This Silicone - VMQ - MVQ O-Ring has a diameter of 18.00x4.50 mm and is Transparant in color. The hardness of this O-ring 18x4.5 - VMQ - MVQ - Silicone - 70 Shore A - Transparent - ORS232268 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 874861 are referred to as 232268 and have a DIN 3771 size of 18.00x4.50. This item is equivalent to and has an Conform FDA approval. The chemical name of this O-Ring is Vilnyl Methyl Silicone.