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GRI-GM42 specification for high-performance HDPE geomembranes
April 1, 2025 | GSI News
HDPE geomembranes are excellent barriers against containment transport. However, we’re constantly working to develop the next generation of polyethylene (PE) solutions that combine improved performance, processability and sustainability. GRI-GM13 Standard Specification for Test Methods, Test Prope…
Geosynthetic Accreditation Institute’s Laboratory Accreditation Program (GAI-LAP)
October 1, 2024 | GSI News
The Geosynthetic Institute’s (GSI) mission is to develop and transfer knowledge, assess and critique geosynthetics, and provide service to its member organizations. One way it does this is through the Geosynthetic Accreditation Institute’s Laboratory Accreditation Program (GAI-LAP). GAI is one o…
Koerner announces GSI ascendancy plan
July 1, 2024 | GSI News
One of the big announcements at the 5th Pan-American Conference On Geosynthetics (GeoAmericas 2024) in Toronto came from George Koerner who announced that he is stepping down as director of the Geosynthetics Institute (GSI) but is not retiring in 2025. “I’m transitioning but certainly not ending…
Color, color comparison and color fastness of geomembranes
July 1, 2024 | GSI News
The Geosynthetic Institute is developing a new geomembrane specification for colored polyethylene geomembranes. It is called GRI Standard GM-39 “Standard Test Method for Determining the Color, Color Comparison and Colorfastness of Geomembranes.” This method is needed to access color difference a…
Soliciting all interested parties in creating a new geomat specification
April 1, 2024 | GSI News
The Geosynthetic Institute (GSI) has a long history of creating industry-wide generic specifications for geosynthetics. At present, we have 23 promulgated and three others under development. Like all engineered materials, geosynthetics need general requirements/thresholds to incorporate into plans a…
New test method for controlling the manufactured geometry of geosynthetics
February 1, 2024 | GSI News
The Geosynthetic Institute (GSI) has a new test method for determining bow and skew of geosynthetics. This method was created to give installers and product users a way to quantify the geometric quality control of goods they have purchased. Geosynthetics are ever increasingly integrated into transpo…
Lower trial weld strengths in polyethylene seams
October 1, 2023 | GSI News
Polyethylene (PE) seaming techniques are used in the field to fabricate rolls of geomembranes into liner systems. There are two predominant methods used: hot wedge “fusion” welding and “extrusion” seaming. Over the past year, installers have noticed lower trial weld strength than in years pa…
Need for substitute surfactant for ASTM D5397
August 1, 2023 | GSI News
It has been brought to our attention by the ASTM task group regarding ASTM D5397, Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test, that the surfactant used in this experiment (Igepal CO-630) is a regulated substance i…
Updated accelerated aging test for geomembranes
June 1, 2023 | GSI News
The accelerated aging process is based on the relationship between temperature and chemical reaction rate, in which the reaction rate increases as temperature rises. Most accelerated aging tests use higher temperatures to accelerate the aging process by representing real-time aging artificially. A g…