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Filter Cloth Nomenclature (now its as clear as mud!)

There are several different cloths commonly used for filter presses.

Polypropylene Mono/Multifilament Material         PMM

Permeability = 5-15 CFM
Pore Size     = 10 micron
Industry      = Manufacturing and Oil and Gas

This cloth performs well in oily, sticky or tacky solutions such as oil sludge. The mono-multifilament weave cloth has dual characteristics. The mono-filament weave (the black shiny side of the cloth) faces the cake side of the filter, giving high release characteristics, while the multi-filament side allowing for tight micron retention. it is quick to clean up and is frequently used when precoat and bodyfeed operations are required.

Polypropylene Multifilament Material         PMU

Permeability = 1-5 CFM
Pore Size     = 5 micron
Industry       = Plating and Mining

This cloth is the most popular cloth for metal hydroxides, and preconditioned or polymerized sludge's. It offers medium cake release characteristics and the high durability of the fabric has made it the standard for most filter press applications and will usually come with a new Filter press unless otherwise specified.

Polypropylene Monfilament Material         PSM

Permeability   = 100 CFM
Pore Size       = 50-100 micron
Industry        = Laundry

This material is used in high flow low clarity applications. Often specified when multifilament cloths blind off such as the laundry industry. To achieve the normally expected filtration results this cloth is often used with in conjunction with filter aids such as diatomaceous earth DE. DE is used as a filter aid in two ways, often called "Precoat" coating the cloth before applying sludge and "Bodyfeed" adding the filter aid in a continuous stream to the sludge fed to a filter.
PSM will retain the average size DE filter aid and act as a septum. It will allow water to pass through it while retaining the DE without a high pressure drop. It has excellent release characteristics. It is the coarsest commercially available filter cloth.

Fancy Twill Weave         FTW

Permeability = 0.5-1.0 CFM
Pore Size     = 2.5 micron
Industry       = Food Processing

This cloth offers the tightest weave available for commercial filter presses, it has a very high release characteristics. FTW is the most durable of all filter cloths and is generally used in high pressure, high temperature applications

 

 

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