The Geosynthetic Institute (GSI) has announced that it is reinstating GRI standard GM18, “Test Methods, Test Properties and Testing Frequencies for Flexible Polypropylene Nonreinforced (fPP) and Reinforced (fPP-R) Geomembranes.” This reinstatement follows a four-year absence and significant discussion in the geosynthetic community on the proper testing of and standardization approaches for polypropylene geomembranes and service life estimations. GRI’s standards are generic, voluntary and free for use. A copy of the specification is available here.
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