The specific formulation of our Alvatech Geomembranes provides excellent weldability, highlighting its mechanical properties and chemical resistance. Manufacture by flat extrusion (Calendered System); using the latest technology which provides high precision thickness regulation and uniformity of surface finish. Our geomembranes are used in hydraulic, environmental, mining and industrial projects. Alvatech geomembranes easily meet the quality standards required by the regulations in force in the different markets of Europe and America. Sotrafa guarantees a perfect performance of its geomembranes thanks to the use of the best polyethylene resins, which together with the incorporation of primary and secondary antioxidants considerably extend the life of the membrane.