Disposable PTFE Syringe, PTFE 0.45 um Filter Hawach. Hawach WINSTAR 0.22 um hydrophilic disposable PTFE syringe filters have a wide range of pore size and work well for cleaning small volume samples for HPLC or GC. Hawach WINSTAR PTFE-L syringe filters with pore size of 0.22μm are golden, and syringe filter.