This CR - Neoprene O-Ring has a diameter of 37.7 x 3.53 mm and is Black in color. The hardness of this O-ring 37.7x3.53 - CR - Neoprene - 70 Shore A - Black - ORS175242 is 70. Alternative names for the compound are Neoprene, and it is commonly produced by Neoprene® | Baypren® | Denka Chloroprene® | Skyprene® | Butaclor® | Nairit®. The O-Ring is typically used in and has an operating temperature range from -40 ºC to 100 ºC. O-Rings 446978 are referred to as 175242 and have a DIN 3771 size of 37.7 x 3.53. This item is equivalent to and has an approval. The chemical name of this O-Ring is Polychloropreen.