0.22 Micron and 0.45 Micron PES Syringe Filter designed for Aijiren, Waters, Varian and Shimadzu Autosamplers provide trouble-free operation. Dust free workshop, prevent pollution uses. Five types of material, including Nylon, PTFE, MCE, PES and PVDF, are available. ABOUT US. Mastelf is specialized in the line of medicine, life-science