Lab All Pure PTFE Syringe filters are purpose-built with features designed to bring the highest levels of performance and purity to your research. Nylon Syringe Filter, 0.45 m, 30mm, Prefilter:Glass fiber non-sterilized 100pcs. Fixed Price. $ 23.89. +$0.00 shipping. 10-100pc PTFE Syringe Filter 13mm 25mm Diameter, 0.45 um 0.22 um Pore Size, HPLC.