Keytec 400 High Performance

Gas Barrier

Key features

  • Five layer process membrane
  • Exceeds DPM standards
  • Extremely low gas transmission
  • Gas barrier for methane, carbon dioxide, radon and hydrocarbon - VOC vapours
  • Weldable with conventional hot air equipment
  • Aluminium foil core
  • Meets BS standards for DPC

Keytec 400HP gas barrier: Specification methane and CO²

Keytec 400HP gas membrane is loose laid to a prepared substrate. The membrane contains at least 15µ aluminium foil, reinforced with polyester multistrand scrim and encapsulated with polyethylene films. The puncture resistance has a CBR of at least 154.5N and maximum elongation of 25% with a minimum thickness of 0.600mm and a methane transmission of less than < 0.01cm³/m²/h. Keytec 400 HP is fully hot-air welded and tested for peel and sheer within the application.


Scrim reinforced polyethylene and aluminium.

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Keytec 400HP can be used in a variety of applications including the protection againt Methane, Radon, CO² gases and also Hydrocarbon vapours
Material specification CE MARK to EN 13967
PropertyUnitValueTest method
Unit weightg/m²383ASTM D 1505
Thicknessmm0.620ASTM D 5799
ElongationMD & CD25ASTM D 6693
Tensile strengthk/N/m9.47ASTM D 6693.04
Methane transmission cm³/h/m²1.87 x10-10ASTM D 1434
Oxygen transmissionNIL
Moisture transmissiong/m²/dayless than 0.01
Radon improvement factor500-1
Puncture resistanceN154.5ASTM D 4833
Resistance to RootsDD CEN/TS 14416:2005