PTFE Syringe Filter, AQ brand, 0.45µm, 25mm housing, PTFE Advanced Quality PTFE Syringe Filters, AQ™ brand, for Pharmaceutical Grade HPLC & Dissolution Testing. Manufactured with a unique 0.45µm PTFE or Polytetrafluoroethylene (purest form of Teflon©) in a 25mm polypropylene housing, these syringe filters are made for laboratories that require