Membranes

Membrane filters or “membranes” are microporous plastic films with specific pore size ratings. Also known as screen, sieve or microporous filters, membranes retain particles or microorganisms larger than their pore size primarily by surface capture.
Some particles smaller than the stated pore size may be retained by other mechanisms. Micropore membranes are produced by three different processes.
Mixed Cellulose Esters, Cellulose Acetate, and Nylon are reverse phase solvent cast membranes, where controlled evaporation or removal of the complex solvent system forms the porous structure. Both hydrophilic and hydrophobic PTFE are made by a patented process where the membranes are stretched biaxially to form the porous structure.
• Strong: Micropore membranes are monitored for both burst (longitudinal) and tensile (lateral) strength.
Supported Acetate and Nylon are the strongest reverse phase membranes available from Micropore
• Chemically and biologically clean: As part of a comprehensive
quality program, only high purity reagents and raw materials are used to produce Micropore membranes.
Once cast, the membranes are handled in a class 1000 clean room to minimize ambient contamination. While some membranes require a small amount of an aqueous wetting agent, Cellulose acetate has the lowest aqueous extractables (0.1 weight %) and Nylon, inherently hydrophilic, contains no added wetting agents or surfactants. All Micropore membranes are Triton-free except Nylon
• Thin membranes with high porosity: Uniformly thin membranes (typically 150 μm) with high porosity (about 80%) provide high gas and liquid flow per unit area. High porosity also provides high surface area for adsorption or binding
• Thermostable: All Micropore membranes can be sterilized by autoclaving. Operating temperatures of up to 180°C can be achieved depending upon the membrane polymer
MICROPORE membranes are manufactured in ISO 9001 certified facilities.
Membrane filters are used with the barrel filter holder, plate-type in-line filter holder and the in-line filter holders in Industrial products as Pharmaceuticals Industries, Foods, Water and Chemicals Industries and These filter membranes are used primarily for water quality sampling filtration for trace metals and chemical analysis. The standard filter membranes are offered in four basic materials.