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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.
Many modern rubber formulations employed in the pharmaceutical industry for closures (stoppers and plungers), employ halobutyl rubbers as the base. Halobutyl rubbers typically have lower levels of extractables compared to other rubbers, and excellent resistance to permeation by water and oxygen. But, when selecting the most suitable rubber formulation for a stopper or plunger, it must be remembered that the formulation comprises more than just the base rubber - it includes fillers, vulcanizing agents, antioxidants, pigments, etc. The sum of these components, and the manner in which compounding is performed, gives the formulation its properties.
Having the right base rubber, but not having the right additives for the full formulation, will result in poor performance. Having the right formulation, and understanding the needs of the drug product, such as compatibility and long-term stability with the formulation, will help to achieve high performance.
Given the myriad of drug products, and the variety of possible interactions, the best way to select the right rubber formulation for a closure is to discuss the options with a West Technical Customer Support (TCS) expert. West has many offerings – choosing the right one aids in achieving that objective that always is most important – patient safety.
For further information and assistance on selecting the proper formulations and rubber for you drug product please contact West’s Technical Services.
Take an in-depth look at the science behind containment & delivery of injectable medicines in the West Knowledge Center.
<p>By Katrina Firlik, MD<br>Chief Medical Officer<br>HealthPrize Technologies</p><p>Although modern pharmaceuticals and advanced drug delivery systems save and improve the lives of millions of people around the world, there are countless others whose lives are not saved or improved—because they don’t take the medication at all, or often enough. Former Surgeon General C. Everett Koop summed it up best: “Drugs don’t work in patients who don’t take them.”</p>
<p>The needle of a pre-filled syringe is extremely important. From manufacture, through packaging/transportation, to patient delivery – if the needle is not protected, the drug product cannot be delivered effectively. To protect needles to ensure patient safety, West has developed <a href="/zh-cn/products/prefillable-systems/syringe-components/rigid-needle-shields-and-tip-caps">Rigid Needle Shields </a>(RNS) in two sizes: 1/2” for subcutaneous injections (e.g., heparins) and 5/8” for intramuscular injections (e.g., vaccines). RNS consist of a two-part system – a soft rubber inner shell and a perforated, hard polypropylene outer shell. This system maintains container closure integrity (CCI) for both an ISO 11040 glass syringe with staked needle, and a polymer-based syringe (e.g., <a href="/zh-cn/products/prefillable-systems/daikyo-syringe-systems/insert-needle-syringe-components">Daikyo Crystal Zenith® insert needle syringe</a>).</p>
West is pleased to announce that its Tech Group Rockford facility has received a 2014 Lilly Global Supplier Award. Lilly presented the award at a special global recognition ceremony on April 30, 2014, at Lilly corporate headquarters, Indianapolis, Indiana.
West employees have forged a strong bond with many of the local organizations they support through the West without Borders fundraising initiative.
<p><span style="background: white;">West is excited to announce the 2019 recipients of the Herman O. West Scholarship. This year, the Herman O. West Foundation awarded scholarships to eleven children of West team members. </span></p>