Brochure: DOW™ Ultrafiltration Modules

Ultrafiltration or UF is a pressure-driven membrane separation process that helps removes particulate matter from aqueous solutions such as water. UF membranes typically have pore sizes in the range of 0.01 to 0.10 µm and efficiently remove bacteria and most viruses, colloids and silt. The smaller the nominal pore size, the higher the removal efficiency. Most materials that are used in UF are polymeric and are naturally hydrophobic, such as polysulfone (PS), polyethersulfone (PES), polypropylene (PP), or polyvinylidenefluoride (PVDF).

DOW™ UF membrane is made from high-grade polymeric PVDF material to form a hollow fiber membrane that is very durable and less prone to breakage. The hollow fiber has a dense layer or skin on both the inside and outside surfaces, forming a double-walled structure that contributes to its strength. In addition, its fouling resistance is improved by making the membrane surface more hydrophilic than the underlying PVDF polymer. With uniform pore size and outside-in flow, the DOW UF membrane creates a barrier without sacrificing performance.