These syringe filters are available as sterile or non-sterile, with or without glass fiber prefilter. *NOTE: Due to high demand, 13 and 25 mm diameter syringe Syringe Filters – IT TECH. All the syringe filters are certified by HPLC Extractable Test. Hydrophilic PTFE Syringe Filter, 4, 13, 17, 25, 30, 0.25, 0.45. PVDF Syringe Filter, 4,