SOTRAFA S.A.
About
SOTRAFA S.A., headquartered in El Ejido, Almería, Spain, is a geomembrane and geosynthetics manufacturer operating for over 45 years as part of the Armando Álvarez Group, which operates 11 factories with a combined annual capacity exceeding 400,000 tonnes. The company has supplied over 100 million square meters of geomembranes since 2005 and exports to approximately 70 countries. The Alvatech product line produces HDPE, LLDPE, and VLDPE geomembranes in thicknesses from 0.75 to 3.00 mm and widths up to 7.5 meters using multilayer co-extrusion with flat die calendering. Alvatech 5002 is the flagship smooth HDPE liner offering excellent weldability and chemical resistance. Alvatech FIX features a structured surface with 57,000 spikes per square meter for slope stability on gradients exceeding 20%, uniquely available at 7.5-meter width. Alvatech LLDPE provides enhanced flexibility for floating covers and disposal sites, while VLDPE offers maximum conformability for bladder tanks, green roofs, and underground waterproofing. Alvatech White Layer uses a bicolour white-over-black construction to reduce heat accumulation by 20-23°C. The HP-OIT variant incorporates an extended antioxidant package for abrasive or chemically extreme service conditions. Alvatech HTR withstands temperatures above 60°C for hot springs, food processing, and industrial wastewater applications. Specialized products include conductive membranes enabling ASTM D7240 spark-test and ASTM D7007 electric dipole integrity verification, EVOH-based radon barriers for foundation protection, antievaporation thermofilms for mining bioleaching that retain heat and promote microbial activity, and custom-coloured membranes for architectural integration. Complementary product lines include Alvafelt/Alvatex/Alvapol geotextiles, Alvagrid PET/PP geogrids, and Alvadrain M/T drainage geonets. SOTRAFA serves hydraulic (irrigation reservoirs, canals, aquaculture), environmental (landfill liners, wastewater containment), mining (heap leach pads, bioleaching), and civil (tunnel waterproofing, foundation barriers) markets.
Key Products
Flagship smooth HDPE liner in 7.5m width with excellent weldability and chemical resistance for general waterproofing applications
Textured/spiked HDPE or LLDPE membrane with 57,000 spikes/m2 for slope stability on gradients above 20%, available in 7.5m width
Flexible linear low-density polyethylene liner for floating covers, disposal sites, and elastic barrier applications, also available as LLDPE FIX structured variant
Very low-density polyethylene membrane with maximum flexibility for bladder tanks, floating covers, green roofs, and underground structure waterproofing
Bicolour HDPE/LLDPE membrane with white top and black bottom that reduces heat accumulation by 20-23C, minimizing wrinkles and extending installation windows
HDPE/LLDPE membrane with enhanced antioxidant package for extended design life in abrasive or chemically extreme environments
HDPE membrane withstands 60+ C temperatures for hot springs, food industry, and wastewater treatment applications
Coloured polyethylene membrane in 0.75-3.00mm thickness for visual integration in landscaping, ornamental lakes, and snow ponds
Polyethylene film placed on dripper networks for mining bioleaching that retains heat, prevents evaporation, and encourages microbial activity
EVOH copolymer membrane that prevents radon gas ingress into buildings for foundation and basement protection
HDPE/LLDPE membrane with conductive layer enabling ASTM D7240 spark-test and ASTM D7007 electric dipole integrity testing of installed liners
PP/PET non-woven geotextile for filtration, separation, and protection layers in containment and drainage systems
Woven geotextile for reinforcement and stabilization applications
Polyester and polypropylene geogrids for soil reinforcement and slope stabilization
Drainage geonets for conveying liquids in landfill, containment, and drainage system applications
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