UF Membranes (Ultrafiltration Membranes)
UF membranes are thin porous solids that perform separations by retaining and passing solutes primarily based on their size. Key membrane properties include retention capability, solvent permeability, chemical compatibility, mechanical strength for module fabrication and repeated use, consistency, and cost. They have nominal molecular weight limit (NMWL) ratings of 1–5,000 kDa to retain solutes such as macromolecules, nanoparticles, and colloids while passing smaller solutes and solvents. UF membranes retain smaller solutes than microfiltration membranes and larger solutes than reverse osmosis membranes. Food and medical applications require extractable testing, adsorption, shedding, and United States Pharmacopeia (USP) class VI toxicity testing. In addition, these applications require high consistency membranes with vendor quality programs (e.g., International Organization for Standardization (ISO), current good manufacturing practices (cGMP)). With reuse, membrane cost is...
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