This CR - Neoprene O-Ring has a diameter of 12x4 mm and is Black in color. The hardness of this O-Ring 12x4 - CR - Neoprene - 80 Shore A - Black - ORS116238 is 80 Shore A. Alternative names for the compound are Neoprene, and it is commonly produced by Neoprene. The O-Ring is typically used in and has an operating temperature range from -40 ºC to 100 ºC. O-Rings 479294 are referred to as 116238 and have a DIN 3771 size of 12x4. This item is equivalent to and has an FDA approval. The chemical name of this O-Ring is Chloroprene rubber / chlorobutadiene rubber.