High quality and cost effective syringe filters are available in a broad range of membrane materials with sterile and non-sterile packaging Hydrophilic PTFE Syringe Filters, 0.22μm 0.45μm – Hawach The membrane of Hawach hydrophilic PTFE syringe filters is unsupported, 0.22 um Hydrophilic PTFE syringe filters; 0.45 um Hydrophilic PTFE syringe