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Filtration - Liquid

Filtration Media

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Liquid Filtration

Q:

Fuel:  How can I find out which type of resin treatments are available on your media?

A:

Your account manager will be able to describe which type of resin treatments are applied to the media we recommend for your application. This will vary based on the type of application. We do treat our media in order to add strength, modify filter performance, and to improve water resistance/separation. 

Q:

Hydraulic:  What is the maximum temperature that H&V's media can operate in?

A:

Our media are designed to withstand exposure to continuous oil temperatures of 180°.

Q:

Hydraulic:  What is the difference between single phase and dual phase media?

A:

Dual phase media are produced using H&V’s proprietary manufacturing techniques to have a gradient density within one layer of paper. This allows the dual phase media to have higher dust loading capacity than single phase media created by H&V or our competitors.

Q:

Hydraulic:  How do I choose a laminated grade if I need more strength in my application?

A:

First, you should select the correct base grade based on your filtration requirements (i.e. a 5 micron filter application), and then we can determine the correct products to laminate to the base to meet your strength requirements.

Q:

What is the difference between laminating and co-pleating?

A:

Lamination is done at our mills, and the additional scrims or media are physically joined into a single media. In co-pleating the layers are not physically attached to each other. Using a laminated product can allow you to get more layers in your filter than is possible by co-pleating.

Q:

Coalescer:  Why are glass fiber media preferred versus standard cellulose media for coalescing applications?

A:

Today it is recognized that glass fiber media provides a better relationship between water elimination and differential pressure than other media.  The reason for this improvement is that micro glass fibers are available down to 0,2µ diameter.

Q:

Coalescer:  Are there industry standards on water removal?

A:

Water must be reduced to a maximum of 5 ppm in military applications and to a maximum of 15 ppm for civil applications.  H&V coalescing media achieve these targets.

Q:

Coalescer:  Is a prefilter needed?

A:

A prefilter will increase the life time of a filter. Typically a wood pulp is used for this.

Q:

Process Fluids/Water:  What polymers make up filtration media for water and process fluids?

A:

H&V offers media in a wide range of polymers and fiber types which include, cellulose, microfiber glass, polypropylne, polyester, nylon and others upon request.

Q:

Process Fluids/Water:  Why are these different polymers offered?

A:

H&V offers media in a wide range of polymers for chemical resistance, heat resistance, or fiber size which directly affect the micron efficiency of a media. For example polypropylene is highly resistant to wide range of chemicals but would have lower temperature tolerance than polyester or glass. By offering many polymeric products, solutions can be identified to process a variety of liquid streams with different polarity, pH, and oxidizing properties.

Q:

Process Fluids/Water:  Does H&V offer FDA compliant media?

A:

H&V manufactures FDA compliant grades in glass, polypropylene and polyester polymers. Please check with an H&V representative for confirmation that a specific grades is FDA compliant.

  • Polypropylene (21CFR177.1520) 
  • PBT  polyester  ( 21CFR177.1660)

Several of our fiberglass grades are FDA compliant. Please check with an H&V representative for recommendations on FDA fiberglass grades.

  • Fiberglass (21CFR 177.2410 and 177.2420)
  • Acrylic Latex Binder in Fiberglass grades (21 CFR 175.105, 175.300, 176.170, 176.180, 177.1010, 177.2260)
Q:

Process Fluids/Water:  Are H&V media NSF certified?

A:

Several H&V meltblown grades have NFS certification. Please check with an H&V representative to confirm if a specific meltblown grade is NSF certified.

Q:

Process Fluids/Water: How do I evaluate media performance and its suitability for a filter?

A:

There are three important properties to be considered relative to choosing the right filter media: Efficiency at a specified micron size, initial pressure restriction, and dirt holding capacity at a specified flow rate.

When specifying media it is important to understand what efficiency the filter is designed to remove of a given micron particle size. To help in the selection process H&V can provide efficiency curves on some of our media which clearly indicates the efficiency of the media at different micron sizes at a specified flow rate.

The initial pressure drop or flux of the media must be considered. In general there is a tradeoff between efficiency and flux or pressure drop. As the efficiency is increased the flux decreases. In choosing the correct media for your application you want a media with the desired efficiency for the micron rating at the lowest pressure drop as possible to get the maximum flow rate with the least amount of energy.

Dirt holding capacity is also important in determining the life of the filter in use and should be taken into consideration when choosing the most suitable media.

Q:

Process Fluids/Water: What is BETA Ratio?

A:

BETA ratio is used to measure the performance of a media at a specified micron size. It is the number of particles at a given micron size that the filter is challenged with divided by the particles at the same micron size that penetrate the filter.

Q:

Process Fluids/Water: Does H&V offer membrane media?

A:

H&V does not produce membranes, however we offer our patented Nanoweb media made with nanofibers. Nanoweb has performance characteristics and pore structure similar to that of membranes and at a lower cost.

These media may be a bridge between standard depth loaded media with high dirt holding capacity and surface loaded membrane media and for this reason are an excellent choice as a prefilter for much tighter membrane media.

This media is available in polypropylene and polyester fiber size of .5 microns and in both calendared and uncalendared versions.

Q:

Process Fluids/Water: Can H&V offer media with a scrim or reinforcing media to enhance durability and pleating characteristics?

A:

 H&V offers media with scrims in both our glass and meltblown media product lines.

Q:

Fuel: Can your media be used with bio-fuels?

A:

Yes, all of our media are compatible with exposure to bio-fuels. To get the best performance in bio-fuel filtration, you should consult with your account manager to find the best media for your application.

Q:

Fuel: Is the microglass used in your glass and some composite fuel media designs safe for common rail diesel systems?

A:

When properly manufactured, H&V microglass media has proven to work effectively and safely in common rail diesel systems. In fact, the inclusion of microglass is responsible for the higher efficiency and higher permeability of our many of our fuel media.

Q:

Fuel: Does H&V make media with meltblown?

A:

Yes, H&V provides a full suite of fuel media made with cellulose, microglass, synthetic, and meltblown fibers. We can supply 100% meltblown media or composite media of meltblown and cellulose which provide the optimum combination of efficiency and filter capacity.

Q:

Fuel/Water Separation:  Why are glass fiber media preferred versus standard cellulose media for coalescing applications?

A:

Glass fiber media are preferred because the smaller diameter fibers provide a better relationship between water elimination and differential pressure than other media.

Q:

Fuel/Water Separation:  Are there industry standards on water removal?

A:

Water must be reduced to a maximum of 5 ppm in military applications and to a maximum of 15 ppm for civil applications.  H&V coalescing media achieve these targets. 

Q:

Fuel/Water Separation:   Is a prefilter needed?

A:

A prefilter will increase the lifetime of a filter. Typically a wood pulp is used in this media type.