Description. Whatman 13 mm Puradisc Filters are produced from pigment-free polycarbonate with standard inlet (female luer lock) and outlet (male luer) connections. Chat Now Whatman Syringe Filters, PTFE, Material: PTFE Whatman 6875-1302 GD/X 13 mm Syringe Filter, PTFE filtration medium, 0.2 um (1500 pcs) Regular Price: $2,401.25 Price $2,088.05