High Efficiency Air & Liquid Filtration | How to Choose Liquid Filtration
Media

There are three important properties to be considered relative to choosing the right filter media:

• efficiency
• dirt-holding capacity
• clean pressure restriction

Hollingsworth & Vose's meltblown synthetic media are designed to have lower pressure restrictions for a given performance over other similar products. The advantages of our meltblown filter media are typically evident with the need
for higher efficiency with reduced back pressure.

This table lists typical markets and applications for H&V products, which are characterized by high efficiency and reduced back pressure.

Beta Ratios and Efficiencies

So we can effectively meet your requirements, it is important to be specific as to a beta ratio or efficiency at specific particle sizes. The table below relates beta ratio to efficiency.

Efficiency (%) = (ßx - 1) / ßx100 (Where ß equals the desired Beta Value for particle size x )

Beta ratios of 50 and 100 are most frequently used for process liquid filtration. Beta ratios of 200 and 1000 are more common for microbiological contaminant removal for food, beverage and potable water applications. This rating is only an estimate due to the wide variety of filter element designs. Different customers may find that they need media with higher or lower efficiency to obtain their targeted filter element efficiency.

With all that said, choosing a filter media is not as simple as running an equation or looking at pore size data. One cannot expect particle contaminants with ragged edges and rough surfaces to behave as the fluids used for quantitative testing and analysis. Nor can one expect biological contaminants, which may elongate and change shape to behave in a predictable manner based on size.

The final media selection is going to depend on a variety of input data including but not limited to filter design, dirt level, particle size, flow rate, flow pressure, desired efficiency, allowable pressure drop, etc.
The Technical and R&D departments at Hollingsworth & Vose Company are well versed in performance requirements and anxious to help all customers in choosing and/or designing a media for your particular
application.

Chemical Resistance

The chart below is designed to provide filter manufacturers and end users with general guidelines as to how various fibers are affected by exposure to broad chemical families. Specific chemical resistance and compatibility will depend on solvent strength, temperature, duration of exposure, binders used, etc. H&V's R&D engineers will be happy to work with you to provide more specific solvent compatibility detail or to help design a product to meet your specific needs.



Fiber Chemical Resistance Guide

The chart below is designed to provide filter manufacturers and end users with general guidelines as to how various fibers are affected by exposure to broad chemical families. Specific chemical resistance and compatibility will be dependent on solvent strength, temperature, duration of exposure, etc.

The R&D engineers at Hollingsworth and Vose will be happy to work with you to provide more specific solvent compatibility detail or to help design a product to meet your specific needs.

Chemical Resistance based on exposure at room temperature.

ND - No Damage
MD - Mild Damage
ID / NR - Immediate Damage / Not Recommended
NA - Data Not Available


The chemical resistance data set forth above is intended solely as a general guideline for customers of Hollingsworth & Vose Company when selecting fiber composition. Specific solvent resistance will be dependent on solvent strength, temperature, and duration of exposure, among other factors. In addition, the use of binders or other chemicals in web bonding may affect the chemical resistance properties set forth above.

Testing and approval of media by the customer in specific solvents under actual exposure conditions is strongly recommended to determine chemical resistance in a particular application.

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