Captiva Syringe Filter Captiva Econofilter, polypropylene housing, polytetrafluoroethylene (PTFE) membrane, 25 mm diameter, 0.45 µm pore size, 250/pk Part Number: 5190-5268-250 Specifications: Diamater : 25 mm Housing Material : Polypropylene Pore Size : 0.45 µm pH Range : 1-14 Filter Material : PTFE Syringe Filter Type : Econo Color Code : Light Blue Luer Type : Lock