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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.

 

 Polyester and Porous Titanium.  These are specialized materials for handling viscous fluids (LOFCLEAN) and very aggressive or hot fluids (LOFMET).