PLASTIKA KRITIS range of geomembranes includes HDPE, LDPE, LLDPE, EVA & fPP flexible membrane liners, in widths up to 13 m at 0,3 mm thickness, up to 10 m at 0,5 mm, up to 8 m at 0,75 -1mm thickness and 6 m at 1,5-2 mm thickness.
KRITIFLEX® geomembranes are black and contain 2,5% of a special carbon-black with small particle size, ensuring fine dispersion in the polymer mass and the highest possible UV-resistance. They also contain a package of antioxidants for better thermal stability during manufacture, welding and end use.
For specific applications it is possible to produce geomembranes with different color or even different color on each side.
The geomembranes comply with international standards and specifications, such as GRI GM 13. They have been tested and approved by recognized laboratories. Rigorous quality control of every lot is carried at the company's fully equipped laboratory.
The fact that PLASTIKA KRITIS manufactures in-house the carbon black and additive masterbatches and compounds which are used for the production of geomembranes, ensures that the quality of the products is controlled from A to Z and that the most suitable formulations are used, to ensure optimum performance.
Geomembrane selection
PLASTIKA KRITIS manufactures the following types of geomembranes:
- HDPE
This liner offers the highest tensile strength, impact strength, tear & puncture resistance. It has very good ESCR (Environmental Stress Cracking Resistance) and the highest chemical resistance among polyolefin geomembranes. HDPE is the preferred choice in landfill lining, insulation of chemical plants, roads, petrol stations etc. as well as in mining, due to its chemical resistance. It is supplied in flat rolls 5,8 or 6 m width at a thickness of 0,5-2,5 mm.
- HDPE textured
HDPE textured geomembranes have roughened surfaces in order to increase the friction angle in contact with soil or geosynthetic layers. This increase in friction helps keep cover soil or geosynthetic layers in place and improves the overall stability of the liner on steep slopes, preventing sliding failures and/or slope failures.. Our HDPE liners can be textured either on one side or on both sides.
- LLDPE/LDPE
LLDPE and LDPE geomembranes are softer and more flexible than HDPE. They do not contain plasticizers and can exhibit excellent UV resistance. They can be produced at larger widths (up to 10 m at 1,0 mm) which makes installation faster and more economic.
- EVA
This material has the highest flexibility of all polyolefin liners and is often preferred as replacement of PVC membranes in pond-lining and metal tank lining. Its softening point is lower to that of LLDPE and LDPE so it is not recommended to use it uncovered in warm climates. PLASTIKA KRITIS produces various types of co-extruded EVA membranes, with Vinyl Acetate level between 8% and 14% (the higher the VA level the more elastic the membrane but the lower the softening point).
- fPP
fPP geomembranes are manufactured from a resin which is a reactor alloy of ethylene–propylene rubber particles dispersed on a molecular level in a polypropylene matrix. They offer high resistance in weathering/UV, puncture, tear, multiaxial strain at rupture, abrasion and cold weather. They are very flexible and have excellent dimensional stability. Due to their low crystallinity they are not affected by traditional environmental stress cracking. fPP geomembranes can be conveniently wedge- or extrusion-welded and can be patched using a heat gun. The material is a chemically inert and intrinsically flexible polymer that does not require plasticizers. The excellent conformability of fPP liners enables extra shear interface points for maximum holding power on side slopes. Their ability to be factory fabricated and folded for transport to the installation site in large ready-to-use surfaces, offers a significant reduction in field seaming compared to the more rigid types of geomembranes.
Selection of geomembrane type for a specific project depends on the particular requirements of it. PLASTIKA KRITIS experts are at our customers' disposal to advice on the most appropriate type and thickness of liner for a given application.