Bromobutyl Rubber Stopper Properties

Bromobutyl rubbers properties and applications.

Bromobutyl rubber stopper properties.

Polyisobutylene also known as pib or polyisobutene c 4 h 8 n is the homopolymer of isobutylene or 2 methyl 1 propene on which butyl rubber is based. Bromobutyl chlorobutyl bromo chloro isobutylene isoprene. The answer is it depends. Bromobutyl rubber is an excellent choice for pharmaceutical stoppers and seals applications due to low levels of additives and impurities high impermeability to moisture and air chemical and biological inertness resistance to aging and heat sterilization and easiness to vulcanize using low levels of clean curatives.

There is no significant distinction between bromobutyl and chlorobutyl as the properties of these elastomers are very similar. These elastomers are obtained by continuous halogenization of butyl rubber. Butyl rubber is produced by polymerization of about 98 of. Butyl rubber sometimes just called butyl is a synthetic rubber a copolymer of isobutylene with isoprene the abbreviation iir stands for isobutylene isoprene rubber.

In the us and european markets serum vial stoppers are commonly available in both bromobutyl and chlorobutyl rubber for use in pharmaceutical packaging. Your technical customer service tcs representative can help you decide. Vulcanization heating and curing of natural rubber results in the cross linking of individual polymer chains that forms a copolymer of isobutylene and to a smaller extent isoprene. Subsequent halogenation results in a halobutyl rubber typically bromobutyl or chlorobutyl.