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By Technical Customer Support

September 13, 2013

When choosing an elastomeric formulation for a stopper or plunger used to package parenteral drug products, there are several misconceptions related to the importance the elastomer class plays on the chemical and physical properties of the elastomer. Often we hear customers make general statements such as “chlorobutyl elastomers are better” or “bromobutyls have an advantage in property X.” In actuality, each elastomeric formulation is unique and has different properties that are independent of the class of elastomer.