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What problems should be paid attention to when using microporous membranes?

Issuing time:2023-08-16 10:58

When we use microporous filtration membranes, there are several important factors that must be considered. This is mainly to ensure its correct and effective use. Here are some key points that should be paid attention to in use for your reference:

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1. The chemical compatibility of the filter membrane with the measured substance, to ensure that the microporous filter membrane is compatible with the fluid or gas being filtered, because some fluids may be chemically corrosive or contain solvents or particles that may degrade or block the membrane, choose the same Fluid chemically compatible membrane materials to prevent damage or failure. You can measure the pH value of the liquid or gas to be tested, and then compare it with the pH value of the membrane provided by the manufacturer. If the difference is too large, then it will take several measurements to decide whether to replace the filter material based on the results.


2. The size of the pore size of the filter paper. Microporous filter membranes have a specific pore size, which determines the size of the particles or pollutants they can effectively remove. Select a membrane with an appropriate pore size to meet the application requirements, considering the particles that need to be retained or filtered out or The size range of microorganisms. This item is also more important. If you want to obtain an effect close to or equal to the actual value, then it is necessary to measure the particle size of the intercepted particles and the passing particles before filtering, and then choose a filter material with a suitable pore size. practice.


3. Working pressure and flow rate of the test process. Microporous filtration membranes have pressure and flow limits specified by the manufacturer. Operating the membrane within the recommended range is critical to maintaining filtration efficiency and preventing membrane damage. Exceeding the pressure or flow rate limit may It will cause the membrane to rupture or reduce the filtration performance. Even if the pressure and flow rate are kept within the range required by the manufacturer, the compliance of the measurement results should be compared with the pressure and flow rate used.

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4. Consider pre-filtration when appropriate. It is beneficial to use a pre-filter or depth filter before the microporous membrane, because pre-filtration helps remove larger particles or pollutants, reduces the load on the microporous membrane and prolongs the life of the filter. Its service life, especially for some high-precision microporous membranes, is especially important when filtering fluids containing a large amount of suspended solids.


5. Regular cleaning and maintenance, microporous filtration membranes are critical to ensure optimal performance and longevity, follow the manufacturer's cleaning procedure guidelines, including the use of appropriate cleaning solutions and techniques, improper cleaning may damage the membrane or cause contamination , Different membrane materials are used, and the chemical compatibility is also different, which must be paid attention to.


6. In the case of sterilization, some filtration is used for medical treatment and requires sterile filtration. In this case, it is necessary to ensure that the microporous filter membrane and the entire filtration system are properly sterilized. Different membrane materials have different effects on sterilization methods ( For example autoclaving, gamma irradiation, or chemical sterilization) have varying compatibility, choose a membrane of material that can withstand the chosen sterilization process without compromising its integrity.


7. Measure the operating conditions of the process, the temperature and pH range of the fluid being filtered. Make sure the chosen microporous membrane will withstand the operating conditions without degradation or chemical reaction, extreme temperatures or pH levels can affect membrane performance and lead to failure, as stated earlier, in addition to chemical compatibility, temperature during filtration is also Topics that must be paid attention to must be familiar with the temperature range in the process and compared with the temperature resistance of the membrane material used to ensure safety.


8. Integrity test of the membrane, the storage of the filter has a period limit, including the storage condition. The manufacturer will also reflect it in the instruction manual of the membrane. Even so, the integrity test of the microporous membrane should be carried out regularly to verify To check its performance and detect any potential defects or leaks, common integrity testing methods can include bubble point testing, pressure hold testing or diffusion testing, etc.

Such regular testing helps to ensure the reliability and effectiveness of the filtration process.

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For professional testers, similar to the application of filter membranes, pay attention to the factors mentioned above in use, and at the same time, follow the manufacturer's guidelines, we can not only guarantee the effect of the test, but also optimize the use of microporous filter membranes and maintain its efficiency and longevity.



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