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Solving the Challenge of High pH Injectable Drug Products
Click Here

Solving the Challenge of Single-Use Large-Volume Delivery for Patient Self-Injection
Support
Regulatory Support
West Regulatory Affairs provides a single point of contact to assist with global registration strategies for all West products and processes.
Regulatory Support
Knowledge Center
The West Knowledge Center provides scientific insight and more detailed technical information on key areas of expertise featuring technical reports, bulletins and science posters.
Knowledge Center
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June 25, 2019
Bromobutyl versus Chlorobutyl Rubber Formulations - General Aspects
Rubber components are essential for the safe containment and delivery of parenteral drug products. Many rubber formulations used in the pharmaceutical industry are based on halobutyl rubbers. Halobutyl rubbers, typically bromobutyl or chlorobutyl, are made by the halogenation of butyl rubber, which is a copolymer of isobutylene and isoprene (to a smaller extent). Key features of halobutyl rubbers that make them suitable for the pharmaceutical industry are that they typically have lower levels of extractables compared to other rubbers, and they have excellent resistance to permeation by water and oxygen.
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April 09, 2012
Evaluation of residual moisture in lyocakes and corresponding lyophilization stoppers of different rubber formulations

Amy Miller & Jennifer Riter
Analytical Lab Services