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Filter Cartridges: Materials of Construction

 

Most of the filter cartridges we offer are made from one of the following materials, listed in order of most common to least common.

 

Polypropylene

The most common material of construction for our filter cartridges, polypropylene offers a broad fluid compatibility, can be used at relatively high temperatures and satisfy various FDA regulations related to food, beverage and pharmaceutical processes.  Not all "polypropylene" cartridges are the same, the manufacturing technique  and the design of the cartridge directly affect the particle loading and differential pressure for a given flow rate.  The LOFTREX filter cartridges are made with a melt blown process to provide varying densities for increased particle retention whereas other versions utilize multiple layers material to increase retention capacity.  The LOFPLEAT design combines multiple pleated layers to increase available surface area.

 

Asymmetric polyethersulfone (PES) membrane

This is the material used for our membrane filter cartridges, the manufacturing technique enables increased surface area.  The PES used for the LOFMEM filter cartridges satisfies relevant FDA specifications and these are commonly used for beverage and pharmaceutical applications.

 

Gore-Tex® expanded PTFE membrane

LOFMEM-T cartridges are made of this material, the physical characteristics are similar to PES, although the compatibility of PTFE enables LOFMEM-T cartridges to be used for strong acids and bases, aggressive chemicals, solvents and hot DI water.

 

Porous Alloys

The LOFMET series of porous metal filter cartridges are manufactured from stainless steel or titanium and have an efficiency of 99.5% (beta 200).  Advantages of alloy filter cartridges include a maximum temperature rating of 700ºF, maximum differential pressure of 250 PSI and the ability to clean and reuse them.  Higher differential pressures and temperatures are often associated with viscous liquids, process steam and process gas filtration applications.