Guide for Selecting Filter Membranes
Filter membranes have different types and apertures for removing bacteria and impurities, which is important to protect the chromatographic system and column.
Factors to be considered in the selection of membranes
The first thing to consider is chemical compatibility, that is, whether the filtration membrane is acid, alkali, organic solvents and so on.
1. The apertures of the filter membrane;
2. Characteristics of the filter sample.
Characteristics and applications of several common filter membranes:
1. Water system filter membrane
Uniform pore size, high porosity, no media shedding, thin texture, low resistance, fast filtration speed, low cost, but not resistant to organic solutions and strong acids and bases.
2. Nylon filter membrane
Good temperature resistance, high-pressure sterilization of saturated steam for 30 minutes, the highest working temperature 60 ℃, good chemical stability, can withstand dilute acid, dilute alkali and other organic and inorganic compounds and solvents.
3. PVDF filter membrane
Great mechanical strength and tensile strength, superior heat resistance and chemical inertness, low protein adsorption, strong hydrophobicity.
4. PTFE filter membrane
Wide chemical compatibility, good temperature resistance, strong acid, and alkali resistance, suitable for strong chemical corrosive solvents and oxidants.