The research on MF in China began in the early 1970s, mainly focusing on CA-CN membranes. In the 1980s, membranes such as CA, CA-CTA, PS, PAN, PVDF, nylon, etc. were successfully developed, and pleated filter cartridges were further developed; Developed PP, PE, and PTFE membranes for controlling stretch induced pore formation; We have also developed nuclear track microporous membranes of polyester and polycarbonate, and industrialized multi-channel inorganic microporous membranes. And it has a wide range of applications in the fields of medicine, beverages, drinking water, food, electronics, petrochemicals, analysis and testing, and environmental protection.

Microporous filter membrane, also known as microporous filtration, belongs to precision filtration, which intercepts particles such as gravel, sludge, clay, as well as Giardia, Cryptosporidium, algae, and some bacteria in the solution. A large amount of solvents, small molecules, and a small amount of macromolecular solutes can all pass through the membrane during the separation process.

The basic principle of microporous membrane is the screening process, with an operating pressure generally between 0.7-7kPa. The raw material liquid passes through a filtering material under the action of static pressure difference. Filter materials can be divided into various types, such as folding filter cartridges, melt blown filter cartridges, bag filters, microfiltration membranes, etc. Microporous filter membranes made of cellulose or polymer materials are used to trap particles, bacteria, etc. in water using their uniform pore size, preventing them from passing through the filter membrane and being removed.

The separation efficiency of a membrane is determined by its physical structure, pore shape, and size.

There are currently over ten specifications for microporous membranes, with pore sizes ranging from 0.1 to 75 μ m and membrane thicknesses of 120 to 150 µ m.

The types of microporous membrane include: mixed fiber ester microporous membrane; Nitrocellulose filter membrane; Polyvinylidene fluoride filter membrane; Acetate cellulose filter membrane; Regenerated cellulose filter membrane; Polyamide filter membrane; Polytetrafluoroethylene filter membrane and polyvinyl chloride filter membrane, etc.