PYREX scientific glassware has been a trusted partner for chemists and research scientists in the toughest laboratory environments for more than 100 years.
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These PYREX gray polypropylene vented caps have a 0.22 µm polytetrafluoroethylene (PTFE) hydrophobic membrane to allow sterile gas exchange while preventing contamination. They are autoclavable at 121°C, have a GL45 thread and use a linerless plug seal design for efficient sealing.