Fisherbrand™ Basix™ Syringe Filters, PTFE, Non-Sterile offers high sample throughput. EDGE. PTFE Syringe Filter, AQ™ brand, 0.45µm, 25mm housing, PTFE. PTFE – Strong Chemical Compatibility – HPLC Certified – Hydrophobic. Advanced Quality PTFE Syringe Filters, AQ™ brand, for Pharmaceutical Grade HPLC