Hydrophilic PTFE 0.22/0.45 um IC Syringe Filters. Hawach hydrophilic PTFE syringe filters stand up to the most aggressive solvent, acid, and base samples. Female Luer lock inlet, male slip outlet (50mm is hose barb). PTFE syringe filter product numbers ending with "B" are hydrophobic; all other. PTFE syringe filters are hydrophilic.