HiTeC manufactures high quality wide geomembrane liners for a variety of applications, particularly environment and water management projects.

Pond-lining : for artificial lakes and irrigation of farms

Water reservoirs : for collecting rain-water before it reaches
      the sea.

Reservoirs for waste-water : to protect the groundwater
      sources or streams.

Landfills lining: to protect the ground water from       contamination.

Landfills capping: to prevent fluid flow in the landfill, to trap
      and properly vent the gases generated during       decomposition of organic waste and to permit efficient       revegetation and restoration of the land.

Protection of lake banks for soil stabilization

Irrigation canals : an economic alternative to concrete and       compacted earth for transporting water and irrigating large       areas. Also used to reduce seepage from existing       deteriorated concrete linings.

Earth dams : for soil stabilization

Underground insulation of chemical plants, petrol stations &       roads: to prevent chemicals, oil etc. from polluting the       underground water in case of a leakage.

Mining: for preventing contamination of the soil and       underground water and permitting extraction of       precious       metals by heap leaching, using chemical solutions.

Evaporation basins

Aquaculture : water reservoirs for fish breeding.

HiTeC's range of geomembranes includes HDPE, LDPE, EVA and FPP liners.

HDPE liners exhibit very high tensile strength, tear & puncture resistance. Their resistance to chemicals is the highest among polyolefins and this is why it is the preferred choice for municipal landfills lining, for mining and chemical plants ground insulation. They are produced at a thickness of 0,75-2,5 mm and a width of 7 m. HiTeC's HDPE geomembranes are made of prime quality HDPE resin and contain 2,5 % fine carbon black for outmost UV-resistance. They comply to domestic and international standards (GRI GM-13) and have been certified by recognized laboratories in China and abroad.

LDPE liners are more flexible than HDPE. They are produced at a thickness of 0,3-1 mm at widths from 4-14 m, depending on thickness. They are mainly used for small and medium size water reservoirs, for canal lining, as temporary covers and in animal farms (storage of ...).

EVA liners are the most flexible type of polyolefin geomembranes. They exhibit softness, ease of handling and welding, they are more resistant to tear & puncture than LDPE. Due to their relatively low softening point, they shouldn't be used uncovered at hot areas.

FPP (Flexible Polypropylene) liners are the newest generation of premium polyolefin geomembranes. They exhibit a unique combination of flexibility, softness, mechanical strength, weldability and ease to handle and repair. They are highly recommended for water management projects.

Upon demand, all geomembranes can be made suitable for potable water storage.

Preparation of the site and the sub-grade

Successful lining greatly depends on the selection, design and preparation of the site by the owner and the contractor.

The sub-soil should be sufficiently compacted, free of stones or other sharp objects and dry. The thickness of the membrane should be selected based on the angle of the slopes and other design parameters of the project.

Protection layers made of suitable minerals or geotextiles are often necessary.

Handling & laying of the membrane

Attention is necessary when unloading, transporting, storing and unrolling the membrane rolls in order to avoid damaging them.

The sheets should be fixed in anchor trenches at the crown of the embankment and then unrolled down never across the embankment. Individual sections are positioned with an overlap of 10-20 cm.

Welding

Welding of polyolefin geomembranes is effected with hot-air or hot-wedge equipment, by specialized personnel. Joints and repairs are made with extrusion welding equipment.

No welding should be performed during periods of high humidity, strong winds, long lasting intensive sunshine or temperatures below + 5 C.

Before welding starts, it is necessary to carry preliminary tests in order to define the most suitable parameters (temperature, speed, pressure) for the specific climatic conditions and material type. Also, it is necessary to ensure that the sheets are completely clean,dry and free from imperfections. It is recommended that a test-channel is allowed to permit nondestructive testing by air pressure. Weld seams across slopes should be minimized, while crossjoints should be avoided and T -joints should undergo special testing to ensure their impermeability.

HiTeC manufactures strong and flexible polyethylene and polypropylene GPLs (garden pond liners). GPLs are usually 0,3-0,5 mm thick and can be supplied either in rolls of specified length or in various pre-cut dimensions folded and packed in plastic bags or boxes, bar-coded (optionally), ready for sale by garden-centers or large super-markets.

GPLs are used in home-gardening for lining small decorative water ponds. They are fully recyclable and environment friendly as well as aquatic safe. They can be made in black color or in color combinations (e.g. green/black or blue/black) and have a lifetime of 8-10 years depending on thickness and area of use.