This Silicone - VMQ - MVQ O-Ring has a diameter of 31.47x1.78 mm and is Red in color. The hardness of this O-ring 31.47x1.78 - Silicone - VMQ - MVQ - FDA - 60 Shore A - Red - ORS131381 is 60. Alternative names for the compound are Silicone Rubber - PVMQ, and it is commonly produced by Silastic® | Elastosil® | Silopren® | NuSil® | Shin-Etsu Silicone® | Silbione® | Keisper®. The O-Ring is typically used in and has an operating temperature range from -50 ºC to 225 ºC. O-Rings 470859 are referred to as 131381 and have a DIN 3771 size of 31.47x1.78. This item is equivalent to and has an FDA approval. The chemical name of this O-Ring is Methyl Vinyl Siliconenrubber / Vinyl Methyl Siloxaan.