Geosynthetic Accreditation Institute


ASTM D4491
Test Method for Water Permeability of Geotextiles by Permittivity (04.08)


List of Accredited Laboratories:

  • Lab. #1 - TRI/Environmental
  • Lab. #3 - Golder Associates
  • Lab. #4 - Geosynthetic Institute
  • Lab. #5 - NTH Consultants, Ltd.
  • Lab. #8 - SI Geosolutions (Performance Nonwoven Division)
  • Lab. #13 - Precision Geosynthetic Laboratories, CA
  • Lab. #14 - Geotechnics, Inc.
  • Lab. #18 - Shaw Environmental & Infrastructure, Inc.
  • Lab. #19 - HTS Inc., Consultants
  • Lab. #20 - GeoTesting Express
  • Lab. #25 - TC Nicolon
  • Lab. #27 - Pro Pex Co.
  • Lab. #29 - FITI
  • Lab. #31 - NYS DOT
  • Lab. #40 - GSE Lining Technology
  • Lab. #42 - NPUST (GSI-Taiwan)
  • Lab. #44 - BBA Fiber Web Inc.
  • Lab. #45 - Polyfelt Geosynthetics SDN Bhd.
  • Lab. #58 - Propex Inc. (Nashville Lab)

[Method List]

[Laboratory List]

[GAI page]