Membrane MaterialCellulose Acetate; Pore Size (µm)0.2; Membrane Diameter (mm) Syringe Filters, Economical Nylon, PTFE, PVDF-HB, MCE, CA and PP Embedded in a robust 25mm Ø housing of inert, low extractable, pigment free virgin polypropylene MCE (mixed cellulose esters) membrane syringe filters PTFE Syringe Filters – CHMLAB GROUP