Geotextiles and geomembranes

Natural fibers and the majority of regenerated fibers are seldom used to make geotextiles and geomembranes because they are biodegradable. Because of ease of manufacture, useful properties, and general economy, the most common synthetic fibers used in the manufacture of geotextiles are polypropylene (PP), polyethylene (PE), polyester (PET) and polyamide (PA). 

The resistance of PP to microorganisms and ultraviolet light is good and fair to good, respectively. 

Additives required to facilitate processing include various lubricants and plasticizers, whilst those required to enhance durability during service include thermal stabilizers and carbon black which enhance the resistance to ultraviolet attack. PP is more prone to oxidation than PE and therefore the incorporation of antioxidants is an important issue. 

Woven Geotextiles Nonwoven Geotextiles Knitted Geotextiles SUtch-bonded Combination 

The process of applying a thin layer of material upon a substrate is called coating. For the coating process resulting in an impermeable end-product, polymeric fluids (including melts) or powders (consolidated in 

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