WATERPROOF MEMBRANES | MATERIALS
Silver lining: developments in waterproof membranes
Waterproof membranes are used in applications ranging from reservoirs to mining – and must stand up to punishing environmental conditions. Lou Reade reports
Geomembranes are generally made of commodity polymers such as polyethylene (PE) – yet are often asked to perform at elevated temperatures for long periods while containing hazardous materials. It means that developers must work had to come up with robust formulations and designs. GSE Environmental has been awarded a US
patent for its high temperature geomembrane liners and masterbatch formulations. The high temperature liner is engineered to withstand prolonged exposure to temperatures up to 100°C (212F). Above 60°C, standard PE geomembranes typically begin to lose properties. Accelerated oxidation and UV degradation also reduce strength properties. GSE, in collaboration with resin produc- ers, developed an innovative HDPE resin formulation for use at high temperatures. Used in conjunction with GSE’s high temperature stabilisation formula, it led to the creation of a liner with high durability and chemical resistance – and retains these properties at sustained temperatures up to 100°C.
www.filmandsheet.com
“The high temperature liner continues GSE’s history of developing and improving products in response to industry needs, and through collabora- tion with our customers,” said the company. GSE products are used in a number of areas: to line or cap hazardous and non-hazardous waste landfills; to contain materials generated in certain mining processes; and to contain water, liquid waste and industrial products in structures such as ponds, tanks and reservoirs.
Grass capping Last year, GSE developed a patented synthetic grass capping system, for long-term closure of environments such as solid and hazardous waste landfills, coal ash impoundments and mining containment sites. The company says that GSE LiteEarth is an economical alternative to traditional capping systems – which require 3-5 feet of soil, infill and grass. Eliminating these materials reduces the cost of design, construction, and natural resources, as well
May 2018 | FILM & SHEET EXTRUSION 27
Main image: GSE’s patented high tempera- ture geomem- brane liners can be used up to 100°C
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