Environmental roller chain is a new type of precision roller chain developed on the basis of conventional roller chain, in line with ISO, ASME/ANSI, DIN, JIS and other standards, with the same interchangeable size and conventional roller chain, can be matched with standard sprockets. Environmentally resistant roller chain is divided into surface coating chain and stainless steel chain, the common surface coating process is Dacro and Kumet. This kind of chain is generally used in a harsh environment, the need to have a certain tolerance to the environment, the surface coating is directly related to the service life and performance of the chain.