Whatman® Mini-UniPrep Syringeless Filters, now with a new durable plastic cap, provide a faster, easier way to remove particulates from samples being prepared for HPLC analysis. Compatible with most major autosamplers. All-in-one filtration process handles sample loads in one third the time. Wide range of membranes and choice of 0.2 and 0.45µm pore sizes to meet specific sample application requirements. 0.45µm pore size.