Selecting Membranes for Air and Gas Filtration
Learn about the recommendations for selecting air and gas filtration media!
February 25, 2022
The removal of particulate matter from gas streams is easier to accomplish than when working with liquids due to the added interaction mechanisms between particulates and the filter membrane’s pore surfaces. Particles may be arrested by the sieve or direct retention mechanism becoming trapped in the pores which are smaller than the particles themselves. Additional mechanisms involved in adsorptive capture by direct interception include gravitation settling and electrical attraction forces.
There may however be particles suspended within a gas stream that are too small in mass to undergo inertial impacts. Nevertheless, they may be small enough to encounter a filter surface as a result of diffusional movements. As with inertial impact, the low viscosity of a gas stream allows suspended particles to be trapped by diffusive capture. It is this mechanism that is most responsible for the high filtration efficiencies of air filters. The rate of particle capture is inversely proportional to the square root of the particle diameter.
Due to the large variety of filtration media that is available, understanding the factors that govern the air and gas filter efficiencies will guide you to the correct selection for your specific use.
When selecting the best filter media for Air and Gas Filtration, we recommend you consider the following important properties:
- Water Intrusion Pressure
- Differential Pressure
- Air Flow Rate
- Bacterial and/or Particle Retention
- Hydrophobicity and/or Oleophobicity
- Thermal Stability
- Chemical Compatibility
- Compatibility with the preferred sterilization method
If you have questions related to this content or other filtration concepts or how they apply to your specific application, please contact us.
Thank you for your interest. We will be in touch soon.
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Jacques Hestres, Product Manager for Media – Membrane at Pall Corporation
Antoine Pozniak - Product Manager Media - Membrane at Pall Corporation
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