Geosynthetic Accreditation Institute

NTH Consultants, Ltd.
Attn: Debra Klinger
(610) 524-2300

List of Accredited Test Methods:

  • ASTM D374 - Micrometer Thickness
  • ASTM D413 - Adhesion
  • ASTM D638 - Geomembrane Tensile
  • ASTM D751 - Thickness
  • ASTM D751 - Tongue Tear
  • ASTM D751 - Grab
  • ASTM D751 - Seam Strength
  • ASTM D792 - Specific Gravity
  • ASTM D882 - Strip Tensile
  • ASTM D1004 - 90° Tear
  • ASTM D1204 - Dimensional Change
  • ASTM D1238 - Melt Flow Index
  • ASTM D1505 - Density Gradient
  • ASTM D1593 - PVC Thickness
  • ASTM D1603 - C. B. Content (Tube)
  • ASTM D1621 - Core Compression
  • ASTM D1777 - Textile Thickness
  • ASTM D3015 - Carbon Black Dispersion
  • ASTM D3083 - Soil Burial
  • ASTM D3083 - Seam Strength
  • ASTM D3776 - Mass/Unit Area
  • ASTM D3786 - Mullen Burst
  • ASTM D4218 - C. B. Content (Muffle)
  • ASTM D4437 - Field Peel & Shear
  • ASTM D4491 - Permittivity
  • ASTM D4533 - Trap Tear
  • ASTM D4545 - Factory Peel & Shear
  • ASTM D4595 - Geotextile Wide Width
  • ASTM D4632 - Geotextile Grab
  • ASTM D4716 - Transmissivity
  • ASTM D4751 - A.O.S.
  • ASTM D4833 - Index Puncture
  • ASTM D4884 - Geotextile Sewn Seam
  • ASTM D4885 - Geomembrane Wide Width
  • ASTM D5035 - Strip Tensile
  • ASTM D5199 - Thickness
  • ASTM D5261 - Mass/Unit Area
  • ASTM D5321 - Direct Shear
  • ASTM D5323 - 2% Secant Modulus
  • ASTM D5596 - C. B. Dispersion Microtome
  • ASTM D5884 - R-GM Tear
  • ASTM D5890 - GCL Swell
  • ASTM D5891 - GCL Fluid Loss
  • ASTM D5993 - GCL Mass
  • ASTM D5994 - T-GM Core Thickness
  • ASTM D6214 - Chemical Peel & Shear
  • ASTM D6243 - GCL Shear
  • ASTM D6392 - Thermo Peel & Shear
  • ASTM D6693 - GM Tensile
  • ASTM F904 - Ply Bond Strength
  • FTM 101C - Geomembrane Puncture (2065)
  • GRI-GG1 - GG Rib Strength
  • GRI-GG2 - GG Junction Strength
  • GRI-GM12 - Asperity Height
  • GRI-GC7 - GC Adhesion

[Method List]

[Laboratory List]

[GAI page]