Performance and Characteristics of Polyethersulfone(PES) and the Filter Membrane

Polyethersulfone is prepared by condensation of 4,4′-bissulfonyl chloride diphenyl ether with diphenyl ether catalyzed by anhydrous ferric chloride. The refractive index is 1.85, the glass transition temperature is 225°C, and the heat distortion temperature is 203°C (1.82MPa). PES has excellent aging resistance and can be used for up to 20 years at 180°C. PES has good flame resistance and does not emit smoke even if it burns. The creep resistance is good, the strain under 150°C and 20MPa pressure is only 2.55%.

Performance of PES Filter Membrane

Polyethersulfone (PES) is a popular material used in filter membranes due to its excellent chemical and thermal stability, high flow rates, and low protein binding properties. Here’s a closer look at the performance of PES filter membranes:

  1. Chemical and Thermal Stability:
    • PES membranes exhibit robust chemical resistance, making them suitable for a wide range of solvents, acids, and bases. They can withstand high temperatures, allowing for sterilization through autoclaving.
  2. High Flow Rates:
    • PES membranes are known for their high flow rates, which facilitate fast filtration processes. This is particularly advantageous in applications where rapid sample processing is crucial.
  3. Low Protein Binding:
    • PES membranes have low protein binding affinity, making them ideal for applications involving biological samples. This property helps prevent sample loss or adsorption to the membrane.
  4. Biocompatibility:
    • PES is considered biocompatible, making it suitable for applications in biopharmaceuticals, healthcare, and life sciences, where interactions with biological molecules are involved.
  5. Hydrophilic Nature:
    • PES membranes are naturally hydrophilic, which means they readily wet out in aqueous solutions. This property aids in efficient filtration of water-based samples.
  6. Uniform Pore Structure:
    • PES membranes are manufactured with a consistent and controlled pore size distribution. This allows for precise separation of particles and molecules based on their size.
  7. Sterilizability:
    • PES membranes can be easily sterilized through methods like autoclaving, gamma irradiation, or ethylene oxide treatment. This is essential in applications requiring sterile filtration.
  8. Versatility:
    • PES membranes are used in a wide range of applications, including but not limited to filtration of pharmaceuticals, biological samples, solvents, and water.
  9. Resistance to Hydrolysis:
    • PES membranes are resistant to hydrolysis, which means they maintain their integrity and performance even in humid or aqueous environments.
  10. Compatibility with a Range of pH:
    • PES membranes can tolerate a broad pH range, making them suitable for applications with solutions that may have varying levels of acidity or alkalinity.
  11. Consistent and Reliable Performance:
    • Due to their well-defined structure and manufacturing process, PES membranes offer consistent and reliable filtration performance, batch after batch.
  12. Low Extractable and Leachable Levels:
    • PES membranes typically have low levels of extractables and leachables, ensuring minimal impact on the filtered sample.

In summary, Polyethersulfone (PES) filter membranes demonstrate outstanding performance across various applications, particularly in industries requiring high-quality and precise filtration processes. Their chemical stability, low protein binding, high flow rates, and biocompatibility make them a popular choice in pharmaceutical, biotechnology, and healthcare industries.

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PES filter membrane

The pores of the Hydrophobic polyethersulfone filter membrane account for more than 80% of the membrane volume. The micropore opening rate has unique micropores. The geometric shape improves the filtration efficiency and flow rate of the solution that is difficult to filter. Made of polyethersulfone and polypropylene and combined with hot melt and without adhesive, the PES filter membrane can be applied to such industries with stricter requirements as the chemical and pharmaceutical industries.

Main features of PES Filter Membrane

The unique hydrophilic properties, without surfactants and surface lubricants, provide a high level of filtration accuracy and throughput for filtered solutions, a wide applicable pH range, low adsorption capacity. Also, PES filter membrane features a high retention rate, good strength, good thermal stability, and resistance to chemical and forward/reverse pressure shocks. The production process adopts unique hot-melt welding processing technology, without any adhesive, no precipitation, and no pollution to the filter medium. PES filter membrane has high safety and a wide range of applications.

1. Chemical Compatibility:
PES filter membranes are chemically resistant to a broad range of solvents, acids, and bases. This makes them versatile for use in various filtration processes involving different chemicals.

2. Thermal Stability:
PES membranes exhibit good thermal stability, allowing them to withstand a wide range of temperatures. This property makes them suitable for applications involving hot filtration or sterilization.

3. Hydrophilic Nature:
PES membranes are inherently hydrophilic, meaning they have an affinity for water. This property ensures fast wetting and rapid flow of aqueous solutions through the membrane.

4. Low Protein Binding:
PES filter membranes typically have low protein binding characteristics. This makes them suitable for critical applications in the pharmaceutical and biotechnology industries, where minimizing protein adsorption is essential.

5. High Flow Rates:
PES membranes provide high flow rates due to their hydrophilic nature. This rapid flow is particularly advantageous when filtering large volumes of aqueous samples.

6. Microbial Retention:
PES membranes can effectively retain microorganisms, making them suitable for applications such as sterile filtration of biological fluids, pharmaceutical solutions, and water.

7. Broad Pore Size Range:
PES membranes are available in a range of pore sizes, from microfiltration to ultrafiltration and beyond. This variety allows for precise selection of membranes tailored to specific filtration requirements.

8. Low Extractables:
PES filter membranes are known for their low levels of extractables, ensuring that they do not introduce unwanted substances into the filtered sample.

9. Biocompatibility:
PES is considered biocompatible, making it suitable for applications involving biological samples or medical devices.

10. Regenerable:
Some PES membranes can be regenerated and reused multiple times, reducing the cost of filtration processes.

11. PH Compatibility:
– PES membranes are generally compatible with a wide pH range, which allows them to be used in both acidic and alkaline environments.

12. Resistance to Fouling:
– PES membranes are resistant to fouling, which helps maintain their filtration efficiency over extended use.

Typical applications

Pharmaceutical industry: terminal sterilization filtration for injection, water for injection, eye drops, non-high temperature sterilizable products, biological products, vaccines, serum, etc.
Food industry: filtration of alcohol, mineral water, drinking water, beverages, etc.
Electrical industry: terminal filtration of high-purity water, ultra-pure water equipment, chemical raw materials, etc.

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