Lyophilization (freeze drying) is the process of dehydrating a material at low temperature and reduced pressure. It is used to extend the shelf life of many biologic drug products. Absent water, degradation processes are greatly reduced. In any primary package system (i.e., vial, elastomer stopper, seal) for a lyophilized drug product, of utmost concern are leachables and volatile organic compounds that may migrate from the elastomer stopper into the lyophilized drug product, creating a risk to patient safety.