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NovaPure™ lyophilization stoppers made from 4023/50 a premium quality bromobutyl elastomer with West’s lowest particulate specification available. Laminated with FluroTec™® barrier film to help reduce particulate, limit drug interaction with elastomer, reduce leachables. These components are provided ready to use, sterilized and 100% vision inspected via our Envision™ inspection process. This stopper configuration can be used with European blowback, North American blowblack, or straight wall (no blowback) vials. West Item Number: 19700365