A geomembrane is very low permeability synthetic membrane liner or barrier used with any geotechnical engineering related material so as to control fluid (liquid or gas) migration in a human-made project, structure, or system. Geomembranes are made from relatively thin continuous polymeric sheets, but they can also be made from the impregnation of geotextiles with asphalt, elastomer or polymer sprays, or as multi-layered bitumen geo-composites.

Geomembranes are being used in environmental, hydraulic, transportation, and oil and gas applications as well as the waste industry.
The Bombay Textile Research Association (BTRA), a pioneer textile research institute over the 65+ years, was established in 1954 by Govt. of India along with the industry association to boost research, conducting testing, consultancy and certification in the field of textile, polymers, fibers and other materials.

Following are the tests done at BTRA for Geomembranes

  • Thickness [ASTM D: 5199]
  • Density [ASTM D: 792]
  • Tensile Strength [ASTM D: 6693]
  • Tear Strength [ASTM D: 1004]
  • Puncture Resistance [ASTM D: 4833]
  • Pyramid puncture resistance [ASTM D:5494 / DIN EN 14574]
  • Mass per square metre [ASTM D: 5261 / ISO: 9864]
  • Carbon Black Content [ASTM D: 1603/ ASTM D 4818]
  • Melt Flow Index [ASTM D: 1238]
  • Environmental Stress Crack Resistance (ESCR) [ASTM D: 1693 / DIN EN: 14576]
  • Stress Crack Resistance (ASTM D:5397)
  • Tensile Strength by Wide Width Strip Method [ASTM D:4885]
  • Air-oven ageing of polyolefin Geomembranes [ASTM D:5721]
  • Integrity of seams produced using thermo fusion method for Reinforced Geomembranes by Strip Tensile Method [ASTM D:7747]
  • Integrity of seams produced using thermo fusion method for Reinforced Geomembranes by Grab Method [ASTM D:7749]
  • 2% Secant Modulus of Polyethylene Geomembrane [ASTM D: 5323]
  • Chemical resistance to liquids [ASTM D:5747]
  • Resistance to oxidation [DIN EN 14575]
  • Tensile strength before and after oxidation
  • OIT-Normal Pressure ASTM D 3895
  • OIT-High Pressure ASTM D 5885
  • Heat ageing