Characteristics Of Several Commonly Used Filter Membranes
Features: Good temperature resistance, can withstand 121 ℃ saturated steam hot-press sterilization for 30min, the maximum working temperature is 60 ℃, good chemical stability, can withstand dilute acid, dilute alkalies, alcohols, esters, oils, hydrocarbons Various organic and inorganic compounds such as halogenated hydrocarbons and organic oxides.
Uses: Electronics, microelectronics, semiconductor industry water filtration, tissue culture medium filtration. Chemical liquid filtration, beverage filtration, high-purity chemical products filtration. Filtration of aqueous solution and organic mobile phase.
2. Polyvinylidene fluoride film (PVDF)
Features: Membrane filter can not tolerate acetone, DMSO, THF, DMF, dichloromethane, chloroform, and so on.
Uses: Hydrophobic polyvinylidene fluoride membrane is mainly used for gas and steam filtration, high-temperature liquid filtration;
Hydrophilic polyvinylidene fluoride membranes are mainly used for purification and filtration of sterilization filtration solvents and chemical raw materials such as tissue culture media and additives, aseptic treatment of reagents, and filtration of high-temperature liquids.
3. Mixed cellulose ester (MCE)
Features: relatively uniform pore size, high porosity, no medium shedding, thin texture, low resistance, fast filtration speed, minimal adsorption, low-cost price, but not resistant to organic solutions and strong acid and alkali solutions.
Uses: The pharmaceutical industry requires hot-pressed sterilized water injections to filter out particles from large infusions.
For the sterilization of heat-sensitive drugs (insulin ATP, coenzyme A, and other biochemical preparations), use a 0.45-micron filter (or 0.2)
Analysis and determination of particles and oil-insoluble substances in solution, and determination of water pollution index.
It is used in scientific research departments such as somatic cell hybridization and mitochondrial complementation prediction heterosis research.
4. Polypropylene (PPM)
Features: No adhesives, stable chemical properties, flexibility, not easy to break, high-temperature resistance, can withstand high-pressure sterilization. Poisonous and tasteless, acid and alkali resistant.
Uses: It is suitable for making various coarse and fine filters and folding filter elements.
It is suitable for the filter membrane of plate and frame filter press in beverage, medicine, and other industries.
It is suitable for the support and pretreatment of the reverse osmosis membrane and ultrafiltration membrane.
Polypropylene membrane is non-toxic, and can be widely used in medicine, chemical industry, food, beverage, and other fields; it is hydrophobic, and it is particularly good for gas filtration.
5. Polyethersulfone (PES)
Features: The microporous filter membrane made of ether sulfone is a hydrophilic filter membrane. It has the characteristics of a high flow rate, low dissolution, and good strength. It does not adsorb proteins and extracts and pollutes the sample.
Uses: low protein adsorption and high drug compatibility, specially designed for biochemical, inspection, pharmaceutical, and sterilization filtration devices.
6. Polytetrafluoroethylene (PTFE)
Features: The most extensive chemical compatibility, can withstand DMF, DMSO, dichloromethane, THF, chloroform, and other strong solvents.
Application: Filtration of all organic solutions, especially strong solvents that other filter membranes cannot tolerate.