Whatman 6780-1302 Polyethersulfone Puradisc 13 Sterile Syringe Filter, 0.2 Micron (Pack of 50) 13mm; 0.2m Polyethersulfonemembrane Pigment-free polypropylene Optional sterile, medical-grade blister pack 13 mm diameter syringe filter Sample volume up to 10 ml Low hold-up volume &lt; 25 l ensures maximum sample recovery Glass microfiber option available Tube-tip format (optional)