Waters 0.45um syringe filter for hplc 0.45 Syringe Filter at Thomas Scientific The sample prep syringe filters are used for clarification and particle removal from samples before instrumental analysis such as HPLC, IC, and GC. Certified 0.45 micron syringe filter hplc Millex . Pack 50 Millex 25mm LCR HPLC Syringe Filters PTFE 0.45um.