PTFE Hplc Syringe Filter, Size: 13mm 25mm, Pore Size: 0.22 0.45. Chromacol Vial Inserts - Scantec Nordic. There are some important changes in the syringe filters from Chromacol. GMF Pre-filters are available on 30mm PTFE, Nylon , PP and RC units. Syringe Filter for Sale - HPLC Vials. Pore size: 0.22μm/0.45μm. Diameter: 13mm/25mm.