Syringe filters, RanDisc™, PTFE membrane | VWR Syringe [] Syringe filters, RanDisc™, PTFE membrane. Filters Syringe Filters. These syringe filters are ideal for rapid and reliable ultra-cleaning of small volume samples for HPLC or GC analysis, which require an even more chemical resistant unit for solvents such as acetone dimethylformamide and DMSO or for aggressive aqueous liquids.