FILTSTAR TM syringe filter . FILT STAR TM syringe filters are used for small volume filtration of liquids, gas and other material-specified applications. They are available with many different membrane including Nylon, PTFE, Hydrophilic PTFE, PES, PVDF, MCE, CA, GF, PP, in both sterile and non-sterile varieties, and with or without pre-filters.