Characteristics of Several Common Filter Membranes
The microporous filter membrane uses polymer chemical materials, and the pore-forming additives are coated on the support layer after special treatment. It is mainly made of refined nitrocellulose, adding an appropriate amount of cellulose acetate, acetone, n-butanol, ethanol, etc., which is hydrophilic, non-toxic and hygienic.
It is a porous membrane filter material with a relatively uniform pore size distribution, and pore sizes with microporosity up to 80 ‰. It is mainly used for filtration of aqueous solutions, so it is also called an aqueous membrane. Microporous membranes are easy to use and are widely used in many fields such as scientific research, food testing, chemical industry, nanotechnology, energy, and environmental protection.
Features: Good high-temperature resistance, which can withstand 121°saturated steam autoclaving for 30 minutes, the maximum working temperature of 60 degrees Celsius; Good chemical stability, which can withstand a variety of organic and inorganic compounds such as dilute acids, alcohols, esters, oils, hydrocarbons, halogenated hydrocarbons, and organic oxides.
Uses: electronics, microelectronics, semiconductor industry water filtration, tissue culture media filtration, drug filtration, beverage filtration, high-purity chemical product filtration, aqueous solution, and organic mobile phase filtration.
Features: uniform pore size, high porosity, no medium shedding, thin texture, small resistance, fast flow rate, low cost, but not resistant to organic solutions and strong acid and alkali solutions.
Uses: Sterilize heat-sensitive drugs; Analysis and determination of particulates and oil insoluble in solution, and determination of water pollution index; also used in scientific research departments such as somatic cell hybridization and mitochondrial complementary predictive hybridization.
Features: Hydrophilic, high flow rate, low leachable, and good strength. It does not adsorb proteins and extracts and has no pollution to the sample.
Uses: Low protein adsorption and high drug compatibility, specially designed for biochemical, inspection, pharmaceutical and sterilization filtration devices.
Features: The most extensive chemical compatibility, which can withstand strong solvents such as DMSO, THF, DMF, dichloromethane.
Uses: Filtration of most organic solutions, especially strong solvents that are not tolerated by other membranes.
1. Take food-grade polypropylene as raw material, without any additives in the whole production process;
2. Stable physical and chemical properties and good compatibility;
3. With a series of pore sizes, high porosity, large dirt holding capacity;
It can filter out the bacteria of liquid particles such as medicine liquid, gas, oil, beverage, alcohol, electronic instrument, etc. It can also be used for the detection of particles and bacteria.
How does membrane filter work
Compared with the pore size characteristics of the membrane, the solid particles to be separated are usually larger. The exclusion discrimination of physical size, charge or affinity or a combination of these properties decides the separation. The larger ones will be rejected and not accumulate on the surface and have no opportunity to enter the interior of the filter.
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