Geosynthetic Accreditation Institute


ASTM D4751
Test Method for Determining Apparent Opening Size of a Geotextile (04.08)


List of Accredited Laboratories:

  • Lab. #1 - TRI Environmental Inc.
  • Lab. #3 - Golder Associates
  • Lab. #4 - Geosynthetic Institute
  • Lab. #8 - Propex Operating Co. LLC (Performance Nonwovens Division)
  • Lab. #9 - Lumite Inc.
  • Lab. #13 - TRI Environmental Inc. (Precision Geosynthetic Laboratory)
  • Lab. #14 - Geotechnics, Inc.
  • Lab. #20 - GeoTesting Express, Inc.
  • Lab. #25 - Ten Cate Inc. (Pendergrass Lab)
  • Lab. #29 - FITI (GSI-Korea)
  • Lab. #31 - NYS DOT
  • Lab. #38 - CTT Group (SAGEOS)
  • Lab. #40 - GSE Environmental LLC (Kingstree, SC)
  • Lab. #42 - NPUST (GSI-Taiwan)
  • Lab. #45 - Ten Cate Geosynthetics Asia Sdn Bhd.
  • Lab. #57 - Ten Cate Geosynthetics (Cornelia Lab)
  • Lab. #58 - Propex Fabric Inc. (Hazelhurst Lab)
  • Lab. #65 - Bombay Textile Research Assoc.
  • Lab. #70 - RSA Geolab, LLC
  • Lab. #73 - Gia Loi Joint Stock Company
  • Lab. #74 - Agru America Plant (Andrews, SC)
  • Lab. #75 - GEOMATRIX S.A.S.
  • Lab. #70 - TRI Geosynthetic Testing & Services (Suzhou)
  • Lab. #80 - Texel Technical Materials, Inc.
  • Lab. #87 - Willacoochee Industrial Fabrics (Winfab)
  • Lab #93 - Garware Technical Fibres
  • Lab. #95 - Mexichem Colombia S.A.S. (Pavco)
  • Lab. #97 - TUV SUD/PSB Pte Ltd.

[Method List]

[Laboratory List]