The unique combination of properties, such as high permeation barrier, high damping, resistance to ozone and heat ageing make butyl rubber ideal for many automotive non-tire applications. Among the largest of these applications are vibration control applications and dynamic parts including body mounts. Halogenated butyl is widely used because of their high damping, fast reversion-resistant cures and excellent ageing properties, especially with respect to hot flex fatigue. Compared to regular butyl, halogenated butyl can also be formulated to have an intermediate level of oil resistance for use in engine and transmission mounts and automotive exhaust hanger compounds.
Automotive air-conditioning systems use rubbers in seals around the fittings and shafts, ad in hoses that conduct both gaseous and liquid refrigerant. Halobutyl rubbers are considered by many air-conditioning hose manufacturers as the base polymer for this aplication, because of their excellent permeation resistance to the refrigerant, high damping of low frequency vibrations, excellen low temperature properties and excellent heat ageing. The vulcanisates based o halobutyl rubbers, when correctly compounded, meet the most stringent specification requirements and prevent the ingression of moisture into the air conditioning system. Cenway regular butyl IIR-532 and chlorobutyl CIIR-1301 are suitable for this application.
Other important application of butyl rubber in body mounts and sound damping area is for sound systems and earphones.