Conflict with BIS Indian Standard IS16352 for Geosynthetics

August 12, 2025  |  Q&A: GMA Techline

Q: We are a manufacturer of HDPE and have run into a conflict with the BIS Indian Standard   IS16352 for Geosynthetics — High Density Polyethylene (HDPE) Geomembranes for Lining — that requires a geomembrane made with HDPE resin density greater than 0. 94 g/cm3.  Can you help?
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Identifying subsurface liner vulnerabilities

August 1, 2025  |  Q&A: GMA Techline

Q: We’re seeking guidance on technologies or techniques—such as thermal imaging, electrical leak location, or other scanning methods—that could help identify potential subsurface discontinuities or liner vulnerabilities without full exhumation/excavation.
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Durability testing of HDPE geomembranes

July 14, 2025  |  Q&A: GMA Techline

Q: I’m reaching out to request your guidance regarding a technically demanding project from one of our clients. The application involves an exposed reservoir used to store blowdown water from industrial boilers, discharged at temperatures between 60 and 70 C, along with alternating acidic (pH 2) a…
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Resolving geomembrane specification conflicts

June 12, 2025  |  Q&A: GMA Techline

Q: We are having arguments about whether the thickness of our geomembrane meets the specification. Do you have any suggestions which can ease the process?
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Geomembrane Insulation Design

April 1, 2025  |  Q&A: GMA Techline

Q: We have a project where the client has requested us to design a soil cover to protect an HDPE liner from melting due to campfires. The locals like to hang out on the summit of this superfund site and have cookouts, and the privately owned site will not be secured after the 30-year post closure is…
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Geomembrane Seam Sample Testing

April 1, 2025  |  Q&A: GMA Techline

Q: We occasionally receive geomembrane seam samples for testing where LLDPE is welded to HDPE. In this situation, should these samples be tested at 50mm/min. or 500mm/min.? To further complicate this, sometimes these seams are extrusion welds using either HD or LL rod. Does this influence the select…
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Carbon black in geomembrane formulation

April 1, 2025  |  Q&A: GMA Techline

Q: What is the purpose of “good” carbon black in a geomembrane formulation?
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ASTM D5397 Clarification

April 1, 2025  |  Q&A: GMA Techline

Q: I need some clarification regarding ASTM D5397. One of our baths is having an issue with the agitator. Does it impact the testing if the solution is not agitated continuously?
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Geomembrane Installation Risks

April 1, 2025  |  Q&A: GMA Techline

Q: Could you please let me know if there is any information available on risks associated with installing a geomembrane? Our CQA inspector is pressing us for this because the owner is doing a risk assessment of the geosynthetic installation process.
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Overlaying new GCL on damaged GCL

April 1, 2025  |  Q&A: GMA Techline

Q: Can you provide information about overlaying a new GCL on hydrated and damaged GCL?
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