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01Oct92 UK: HT (UK) ADDS CARBOFOL SERIES OF GEOMEMBRANES TO ITS RANGE OF ROOFING AND CIVIL ENGINEERING MEMBRANES.

HT (UK) has added the Carbofol series of geomembranes to its range of roofing and civil engineering membranes.Developed by its German parent company, the new high density polyethylene (HDPE) geomembranes are designed for lining and capping landfill sites; protecting the environment from the kind of pollution which can occur when waste materials leach out and contaminate the soil and groundwater.The company claims that Carbofol HDPE geomembranes meet the requirements of the Environmental Protection Act 1990 and current EC directives for the management of landfill sites.They have high strength, good elongation and recovery properties, are resistant to ultra-violet light degradiation and are resistant to root growth and rodents.Carbofol is made in a standard width of 5.1m, a variety of thicknesses and lengths up to 150 m. A variety of finishes is also available, ranging from a smooth finish for use on flat and shallow sites, to a raised profiled surface which creates friction to give resistance to slippage on sloping sites.The membranes are loose laid on to the surfaces such as stone-free sand.Each sheet is twin welded at the point of overlap to form a homogeneous continuous waterproof membrane. The welding technique used includes an air pressure test on the soundness of every seam.Drainage pipes are located at intervals along the base of the site and fed into filter sumps. The pipes and geomembrane are protected with some 300 mm deep sand and, where required a geotextile sheet.