Butyl rubber is a synthetic elastomer made by combining isobutylene and isoprene. It is a white or off-white translucent elastomer with a density of 0.91~0.92g/cm. Butyl rubber has poor molecular chain flexibility and compact structure, and its air tightness is the first among rubbers. Butyl rubber has excellent heat resistance, weather resistance, ozone aging resistance and chemical corrosion resistance. Properly formulated butyl vulcanizate can be used for a long time at 150~170C, and the heat resistance limit can reach 200C. Butyl rubber products exposed to sunlight for a long time. And in the air, its performance changes very little, especially the anti-ozone aging performance is 10-20 times better than natural rubber. Butyl rubber has excellent resistance to acids, alkalis and redox solutions except for strong oxidizing concentrated acids, and it swells very little in polar solvents such as alcohols, ketones and esters. The above characteristics are determined by the extremely low degree of unsaturation, strong structural stability and non-polarity of butyl rubber.

There are many applications for butyl rubber, but this synthetic rubber is popular for some key products. Tire inner tubes, speakers, roofing, and gas masks are often made with butyl. Butyl is also used by the pharmaceutical and sporting industries.

Types of Butyl Rubber

Regular Butyl Rubber

Regular Butyl Rubber has superior air impermeability, outstanding performance of heat-resistance, chemical corrosion-resistance, thermal aging resistance, and good curing performance. it has high tensile strength and elongation at break, which is determined by the crystallinity of butyl rubber in the stretched state. This means that butyl vulcanizate has better strength even without carbon black reinforcement, so it can be used to make light-colored products.

Brominated Butyl Rubber

The chain molecules of butyl rubber are partially introduced with bromine and denatured. Vulcanization is fast, can be mixed with NR, SBR, etc., and has good adhesion to metals or other polymers.