This HNBR O-Ring has a diameter of  mm and is Black in color. The hardness of this O-ring - 72.67x1.78 - HNBR - LT55 / AED - 90 Shore A - Black - ORS197249 is 90 Shore A. Alternative names for the compound are Hydrogenated Nitrile Butadiene Rubber, and it is commonly produced by Lanxess - Zeon - and LG Chem. The O-Ring is typically used in and has an operating temperature range from ºC to ºC. O-Rings 1049313 are referred to as 197249 and have a DIN 3771 size of . This item is equivalent to and has an LT55 / AED approval. The chemical name of this O-Ring is Hydrogenated nitrile rubber.