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What solutions can PTFE microporous membrane filter?

Issuing time:2023-10-12 16:41

Polytetrafluoroethylene (PTFE) is a fluoropolymer with excellent chemical resistance and is suitable for filtering a variety of solvents. Due to its strong chemical stability, it is widely used in various fields of chemicals and can be exposed to irritants. Chemical chemicals and are used to withstand many different types of solvents. Here is an introduction to the solvents that are tolerated.

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1. Aqueous solutions, including water and water-based solutions, PTFE is hydrophobic, that is, it repels water, but under certain conditions or after special treatment, such as surface treatment, modification, adding hydrophilic additives, aging or scaling, etc. It can still be used to filter aqueous solutions. PTFE is highly water-resistant and has low water absorption and does not degrade or dissolve in water, making it suitable for applications involving water-based solvents.

2. Organic solvent:

Aliphatic hydrocarbons, hexane, heptane, octane, etc.

Aromatic hydrocarbons, such as benzene, toluene, xylene, etc.

Chlorinated solvents, including chlorinated solvents such as chloroform, carbon tetrachloride, trichlorethylene and perchlorethylene.

Ketones, including acetone, methyl ethyl ketone (MEK) and cyclohexanone.

Esters, such as ethyl acetate and butyl acetate.

Alcohols, including ethanol, methanol, isopropyl alcohol, etc.

Ethers such as diethyl ether and tetrahydrofuran (THF).

Amines, including dimethylamine and diethylamine.

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3. Acids and bases:

Hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), phosphoric acid (H3PO4), acetic acid (CH3COOH),

Citric acid etc.

Alkali, sodium hydroxide (NaOH), potassium hydroxide (KOH), ammonium hydroxide (NH4OH), calcium hydroxide (Ca(OH)2), etc.

4. Petroleum-based solvents, including mineral spirits gasoline, kerosene, diesel, lubricating oils, including engine oil, hydraulic oil and other industrial lubricants, solvent naphtha, toluene, xylene, etc.

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The above is a list of solvent types that PTFE filter membranes are resistant to. Although PTFE has a wide range of chemical compatibility, before using any microporous filter membrane, you must check the specific chemical resistance provided by the membrane manufacturer in conjunction with the solution to be filtered. The data and properties inherent to any substance are relative, as other special factors such as temperature or concentration may affect the performance or service life of the membrane.

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