Typar® SF: Independent tests on filtration performance

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Long-term filtration test DuPont™ Typar®
 
 
 

Long-term filtration test conducted by LGA

DuPont™ Typar® SF participated in a long-term filtration test conducted by LGA, a German testing institute.
Within this test, the long-term filter performance of 5 different geotextiles was studied experimentally in large permeameters using three different soils.
All geotextiles differed in permeability, opening size, thickness, mass per unit area and type of polymer. In a series of three tests, samples of 500 mm diameter were submitted to steady state seepage under different hydraulic gradients for periods of between 6 and 24 months.
In the first two performance tests, the water flow was in the direction of gravity.

 
 
 
Typar-functions-separation-stabilisation
 
 
 

The third test series simulated the case of an upward water flow.
In spite of these critical conditions, DuPont™ Typar® SF showed hardly any clogging or blinding and proved its excellent long-term filtration ability even under pressure.

 
 
 
 
 
 

A microscopic investigation showed that it allowed for the building up of a natural soil filter directly above DuPont™ Typar® SF and therefore provided stable long-term filtration conditions.