GEOfabrics manufactures cuspates from optimum quality high density polyethylene or polypropylene, which is extruded into a range of different thickness membranes.
The sheet is formed in an extrusion process, whereby semi-molten polymer is extruded through a flat die, with thickness that ranges from 0.4 to 2mm. These impermeable membranes are vacuum formed into geocuspated cores between 6mm and 40mm thick, depending on the mechanical and hydraulic properties required.
Vacuum forming is a simplified version of thermoforming, whereby a plastic sheet is heated to a specific forming temperature, stretched onto a single-surface mould, and forced against the mould by a vacuum.
Typical uses are:
GEOfabrics’ cuspates are named in accordance with the thickness of the material; e.g. C20 = 20mm thick.
They are also supplied as composites with a geotextile filter bonded to either one side (FC) or both sides (FCF).
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