Ultrafiltration Membranes

Ultrafiltration (UF) is an important purification technology used for the production of high-purity water.

UF is effective for the removal of colloids, proteins, bacteria, pyrogens (e.g. gram-negative bacterial endotoxins), and other organic molecules larger than 0.1 Micron size.

Basic Principles of Ultrafiltration

Ultrafiltration is a pressure-driven purification process in which water and low molecular weight substances permeate a membrane while particles, colloids, and macromolecules are retained. The primary removal mechanism is size exclusion. A properly designed UF cartridge allows efficient rinsing of ionic residue from the cleaning and rapidly returns to optimal resistivity and organic purity (See Figures 1 and 2). Reagent-grade sodium hydroxide has proven to be an effective cleaning agent with the following benefits:

• Effective bacterial destruction
• Effective depyrogenation(endotoxin reduction)
• Efficient destruction of organic contamination
• Reduced occurrence of chemical by-product formation
• Minimal residue or chemical interference
• Economical and east-to-use cleaning age