The shrinkage rates of butyl rubber and chloroprene rubber are different. Because the shrinkage rate of butyl rubber is 2%, and the shrinkage rate of chloroprene rubber is 3%, which is different. Butyl rubber is a synthetic rubber made by copolymerization of isobutylene and a small amount of isoprene, and it is one of the seven general synthetic rubbers (cis-butadiene rubber, styrene-butadiene rubber, Ding Qing rubber, chloroprene rubber, ethylene-propylene rubber, butyl rubber and isoprene rubber). Rubber is an elastic polymer, which can be obtained from the juice of some plants or artificial. Rubber can be divided into synthetic rubber and natural rubber according to different manufacturing methods. It has many uses and products, such as tires and washers.