Membrane filters

Applications:

• Ideal venting filter for all applications
• For aggressive media and cryogenic liquids
• Separation of free water from organic solutions
• Outstanding as gas/liquid barrier
• Filtration of air and (hot) gases

• Chemically inert to aqueous and organic solutions as well as concentrated acids and bases
• Hydrophobic - for aqueous filtration the pressure must be higher than the water breakthrough pressure
• Can be used up to 145°C
• Can be sterilised by all methods except gamma radiation

With PP backing.

Microsart^® @filter 100 and 250 filter units are a sterile and ready-to-use combination of funnel made of PP with 47 mm diameter, filter base and gridded membrane in one unit. They have been specifically developed for the detection and enumeration of microorganisms in pharmaceuticals, cosmetics, food, beverages, water and other liquids. The membrane filters can also be used in conjunction with Sartorius Stedim Biotech nutrient board discs.

Microsart^® media are dishes pre-filled with different types of agar medium, sterile-packaged and ready to use.

Membranes of regenerated cellulose are resistant towards most organic solvents. They are, for example, used for filtration of solvent mixtures and ultrapurification and degassing of HPLC eluents.

These membranes of cellulose acetate have a low protein binding capacity and are suited for aqueous and alcoholic media. The membranes are hydrophilic and can be used for hot gases up to 180 °C. They can be sterilised.

Membranes of cellulose mixed esters are ideal for gravimetric analysis. They are particularly suited for aqueous solutions. The hydrophilic membrane is thermally stable to 125 °C and can be autoclaved at 121 °C. This membrane is often used for contamination tests.

PORAFIL^® NC membranes are made from cellulose nitrate. They are easily wettable and suited for filtration of aqueous solutions. In dry atmosphere these membranes are thermally stable to 125 °C and can be autoclaved at 121 °C.

Polycarbonate membranes are mainly used for the determination of AOX.

Polyester membranes are hydrophilic and particularly suited for fine filtration, dust analysis, aerosol analysis and ultra-purification of solvents.