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Previous Blogs

A group of elastomers
Rubber Chlorobutyl Bromobutyl Elastomers
Bromobutyl versus Chlorobutyl Rubber: What's the Difference?

By Kok Li Kwang

September 08, 2017

The answer is – it depends. Your Technical Customer Service (TCS) representative can help you decide. Butyl rubber, derived synthetically from petrochemicals, is a copolymer of isobutylene, and to a smaller extent, isoprene. Subsequent halogenation results in a halobutyl rubber – typically bromobutyl or chlorobutyl.

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Science Posters Lab Services Labs Lyophilization Rubber Stopper
Evaluation of residual moisture in lyocakes and corresponding lyophilization stoppers of different rubber formulations

By Amy Miller & Jennifer Riter

April 09, 2012

Dr. Heike Kofler, Amy Miller, Jennifer Riter
West Pharmaceutical Services, Inc.

One of the critical success factors for packaging lyophilized drugs is protection against product degradation caused by moisture. Moisture can be introduced into a lyophilized drug product cake from the elastomeric stopper and from the atmospheric headspace; it can also permeate through the stopper, a process known as moisture transmission.

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