Specifications Materials of Construction Filter Media: Supor membrane [hydrophilic polyethersulfone (PES)] Serum Acrodisc Prefilter Media: Binder-free borosilicate glass Acrodisc Housing: 13 mm: Polypropylene 25 and 32 mm: Modified acrylic 37 mm: Polypropylene Serum Acrodisc Housing: ABS Pore Size 0.1, 0.2, 0.45, 0.8, 1.2, and 5 um Effective