The pure polypropylene housings are color-coded and available in smooth rim or gear rim formats.All our syringe filters are HPLC certified. Housing Material: Polypropylene. Effective Filtration Area (cm2): 1.09. Pore Size (µm): 0.22 µm. Holdup Volume (µl): <25. Sample Volume (mL): <10. Inlet Connection: Female luer lock.