Borosilicate glass microfibers are considered to be the ideal filter media available for the coalescing of liquid aerosols. This material is neither liquid absorbent nor adsorbent and consequently, is superior for retaining its original properties while in service. This is extremely desired in analytical service so that the composition of the sample is not altered. Borosilicate glass microfibers are naturally hydrophobic, and liquid aerosol tends to form on the individual fiber droplet form rather than a film. This state is favorable to extending high efficiency filtration. As liquid is captured on the inner layer of the element, it naturally drains off to the outer diameter of the element.
Metallic, plastic, paper (pleated), and baffle units do not exhibit the same natural properties as borosilicate glass microfibers, i.e. metallic and plastic elements do not have fibers to turn liquid contamination into droplet form. A film builds up on these elements, thus increasing ∆p and reducing long-term efficiency.
Sintered elements have about a three time higher initial pressure drop versus microfiber because of the added mass/material. There are specific applications where metal elements are superior, and we do offer them for those instances.
Paper elements have fibers but tend to retain the water droplets like a sponge and there again, ∆p increases and reduces long-term efficiency. Baffles are fairly efficient at removing bulk contamination. Unfortunately, most contamination in compressed air lines is in the form of fine mist.
Headline’s coalescing filter elements are all microfiber – there are no plastic retainers, no sleeves and no end caps to diminish the natural ability of the element to provide high performance filtration. However, the microfiber elements have the flexibility to be wrapped and caged where needed such as CNG and NGV applications.
Borosilicate glass microfibers provide the highest efficiency while maintaining economical costs and long term life.
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