The original Ford Explorer soundproofing cotton is made of butyl rubber.
Butyl rubber is a type of synthetic rubber, made from isobutylene and a small amount of isoprene. It is generally used in the production of car tires and car soundproofing supplies. Now butyl rubber has been widely used to replace asphalt in the name of environmental protection. Good air tightness. It can also heat resistance, ozone resistance, aging resistance, chemical resistance, and shock absorption, electrical insulation properties. It has good resistance to sunlight and ozone and can be exposed to animal or vegetable oils or oxidizing chemicals.