Main Applications of Hydrophobic and Hydrophilic PTFE Membrane Filter

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PTFE material, hydrophobic and hydrophilic two forms of strong chemical corrosion resistance, and good heat resistance. Based on the membrane filtration principle, PTFE is hydrophilic or hydrophobic compared with other filtering materials, with a larger flow rate, very low protein adsorption, and temperature resistance.

ProductDiameterPore SizeSterilePrice
Hydrophobic PTFE Membrane Filters13mm, 25mm, 47mm, 90mm, 142mm, 293mm0.1μm, 0.22μm, 0.45μm, 1.0μm, 3.0μm, 5.0μm, 10.0μmNo
Hydrophilic PTFE Membrane Filters13mm, 25mm, 47mm, 90mm, 142mm, 293mm0.22μm, 0.45μmNo

After being treated with ethanol or isopropanol, the PTFE hydrophilic membranes become PTFE hydrophobic membranes, which can be used to filter aqueous solutions. Because hydrophobic PTFE itself is hydrophobic, after modification, both aqueous and organic solutions can be filtered. The hydrophobic filter cannot be wetted naturally, and hydrophilic membranes can be wetted naturally. Suitable for filtering microorganisms, steam, and all kinds of corrosive liquid. Application of Membrane Filtration

Various specifications of PTFE hydrophilic or hydrophobic are as follows:
Pore size (the pore size is directly proportional to the flow rate, the larger the pore size, the faster the flow rate): 0.1/0.22/0.45/1.0/3.0/5.0/10 um( Hydrophobic ), 0.22/0.45 um( Hydrophilic ).
Diameter (mm): 13, 25, 47, 90, 142, 293mm, etc.

Application of PTFE membrane filter

Hydrophobic PTFE membrane filter is mainly used in:

  1. Air and Gas Filtration:
    • Hydrophobic PTFE membrane filters are often used for filtering air and gases due to their resistance to water. They are employed in applications such as sterile air filtration in cleanrooms and microbiological laboratories.
  2. Chemical Compatibility:
    • Hydrophobic PTFE is chemically inert and compatible with a wide range of solvents and aggressive chemicals. These filters are used in chemical laboratories and industries for filtration in chemically harsh environments.
  3. Venting Applications:
    • Hydrophobic PTFE membrane filters are used in venting applications where gases need to pass through a filter while preventing the entry of liquid contaminants. This is common in applications such as fermentation processes and storage containers.
  4. Oil Filtration:
    • Due to its hydrophobic nature, PTFE is effective in separating oil from water or other liquids. Hydrophobic PTFE membrane filters find applications in oil-water separation processes.
  5. Aerosol Sampling:
    • Hydrophobic PTFE filters are utilized in aerosol sampling for air quality monitoring. They allow air to pass through while repelling moisture, ensuring accurate particle collection.

Hydrophilic PTFE membrane filter is mainly used in:

  1. Liquid Filtration:
    • Hydrophilic PTFE membrane filters attract water, making them suitable for liquid filtration applications. They are used in pharmaceutical, biotechnology, and environmental laboratories for filtering aqueous solutions.
  2. Biological Sample Filtration:
    • Hydrophilic PTFE membranes are commonly used in biological and life sciences research for the filtration of biological samples, including cell culture media, buffers, and other aqueous solutions.
  3. Protein Filtration:
    • Hydrophilic PTFE filters are suitable for protein filtration due to their low protein-binding properties. They are used in laboratories for protein purification and filtration processes.
  4. Sterilization:
    • Hydrophilic PTFE membrane filters are employed in sterilization processes, especially for filtering aqueous solutions and maintaining sterility in pharmaceutical and biopharmaceutical manufacturing.
  5. Diagnostic Assays:
    • Hydrophilic PTFE membrane filters are utilized in diagnostic assays and medical testing where precise filtration of biological samples is required.
  6. Environmental Monitoring:
    • Hydrophilic PTFE membranes are used in environmental monitoring applications for the filtration of water samples in order to analyze pollutants and microorganisms.

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Features and advantages of PTFE hydrophilic or hydrophobic membrane filter

1. No fiber, no leachable problem
2. High durability and fast filtering speed
3. High temperature resistant and sterilizable
4. Low background value, accurate test results
5. Resistance to strong acids, strong alkalis, and corrosive solutions
6. Wide chemical compatibility, can withstand the filtration of organic solvents such as DMSO, THF, and dichloro alkanes.

Featuring light and thin texture, a smooth surface, and high porosity, the PTFE filter membrane has a fast flow rate and is not easy to adsorb.
Chemical stability: It can filter all kinds of ph2-13 liquid medicines, and can also filter instrument oil, 5% acetic acid, 6n sulfuric acid, 6n potassium hydroxide, absolute ethanol, glycerol, methanol, n-propanol, guide alcohol, partial Trioctyl styrene, polyethylene glycol, various alcohols, beverages, vinegar, etc.

The differences between the two types of PTFE filter membrane

1. The ease of being wetted is different
Hydrophilic: easily wetted by water.
Hydrophobic: not easily wetted by water, but easily wetted by organic solvents such as alcohol and isopropanol.

2. Different use of gas and liquid filtration

Hydrophobic filter membranes are generally used for gas filtration.
Both hydrophilic and hydrophobic filter membranes can be used for liquid filtration.

Hydrophobic PTFE membrane filter

Features: good hydrophobicity, and strong temperature tolerance. The surface filter membrane is a hydrophobic filter with no support. It can be used under extreme chemical or temperature conditions (up to 260°C) that other membranes cannot withstand. Even under a very low-pressure difference, it can ensure the unhindered passage of moist air or other gases, while the aqueous solution is not permeable. The membrane is hydrophobic in nature. It has good chemical resistance, which makes it very suitable for filtering solvents or other corrosive chemicals that other membranes cannot filter.

Main uses: Hydrophobic PTFE membrane filter can be used for atmospheric filtration detection, usually only for air filtration. Uncommon hydrophobic membranes can also be used to filter certain organic solvents, such as ethanol. In actual use, liquids that can pass hydrophobic filtration can also pass hydrophilic filtration. Therefore, it is recommended to use hydrophilic filtrate. Suitable for filtering gases, including humidified air.

Hydrophilic PTFE membrane filter

Features: relatively uniform pore size, high porosity, no media shedding, thin texture, low resistance, fast filtration speed, and very little adsorption. The Hydrophilic membrane is able to filter strong corrosive chemicals in almost all organic solvents, whose performance is just the opposite of that of the hydrophilic membrane.

Main uses: filter out particles and bacteria in bacteria liquid, gas, oil, beverage, wine, etc., and can be used for particle and bacteria inspection. Hydrophilic PTFE membrane can be used to filter aqueous solutions, most organic solutions, strong acid, and alkali solutions, and can be used as experimental sewage clarification filtration, etc.