• Exceptional chemical resistance supported by comprehensive test data

• Long-term durability

• Good mechanical properties and environmental stress crack resistance

• Good welded seam peel and shear performance

• Flexible to accommodate undulating ground contours

• High-visibility yellow on upper surface for easy recognition during excavations

Please Register to download Installation Instructions and Product Data Sheets. 

Chemical Resistance test data and other technical documents are available on request by emailing our technical department or telephoning +44 (0)1347 825200

Typical applications - covered installations

Agriculture

Agriculture Slurry lagoons, Biogas production tanks

Civil Engineering & Construction

Basement linings, brown-field developments, building foundations, tanking, tunnel linings

Environmental protection

Containment, contaminated land remediation, groundwater protection, remediation membrane

Gas Barrier

Gas barrier membrane, landfill capping

Industrial

Chemical waste containment, retention ponds, secondary containment liners & basins, sludge desiccation basins, tank floors

Mining

Evaporation and brine basins, leachate pond liners, mining heap leach pads

Waste

Landfill containment and capping, waste disposal & storage sites

Water & Water Treatment

Effluent treatment, fluid barrier, reedbeds, groundwater protection reservoir and potable water lining, water storage & treatment

EN 14414: Chemical Resistance to leachates and aggressive chemicals

EN 14415: Resistance to leaching

EN 13361: Construction of reservoirs & dams

EN 13362: Construction of canals

EN 13491: Construction of tunnels and underground structures

EN 13492: Construction of liquid waste disposal sites, secondary containment

EN 13493: Construction of solid waste storage and disposal sites

Puraflex has been tested to the following EN Chemical Resistance Standards.

Limitations of EN 14414 and EN 14415

The scope of industry standard test in EN 14414 and EN 14415 is limited to but a few hydrocarbons.  Test data is limited to residual tensile strength figures.  Whilst this is a measure of durability, there is no permeation data for measuring the effectiveness of the membrane against specific challenge chemicals often highlighted in contaminated soil risk assessments

Permeation data for hydrocarbons and chemical contaminants is essential for determining the suitability and design life of the particular installation.  Accordingly, Puraflex has been subjected a rigorous permeation testing for hydrocarbons and other chemicals commonly listed as priority environmental contaminants.

Puraflex chemical resistance data for the following hydrocarbons and other environmental contaminants is available to Geotechnical Engineers and Environmental Consultants.  

Immersion Testing, also known as Accelerated Life Testing (ALT), is used to stress a membrane at a higher level of chemical concentration and temperature than it would experience in normal use.  As a rule of thumb, chemical reactivity doubles with a temperature increase of 10°C.  Therefore testing at 50 ºC simulates an 800% increase in chemical reactivity, compared with tests at an ambient 20 ºC.

The method of test is immersion testing and is the basis for EN 14414 and EN 14415.  It is normally performed at a 100% concentration and typically the sample is immersed in the challenge chemical and maintained at a raised temperature for a specified period, 50 ºC for 56 days. 

The test measures changes in weight, volume and tensile strength to provide an indicative measure of the material’s durability.  These measurements are then compared with a control sample and the extent of the variation is indicative of the extent of chemical attack.  Residual tensile strength and elongation must be greater than 75%.

Test Data for Hydrocarbons and other Toxic Industrial Chemicals is available to Geotechnical Engineers and Environmental Consultants to evaluate Puraflex's suitability for a specific project.  Please contact our Technical Department for further details.

Permeation is a natural phenomenon that occurs with all membranes.

It is a process by which a chemical passes through the membrane by molecular diffusion.  This occurs when the membrane absorbs the chemical until the membrane is saturated; the chemical then diffuses from the opposite side. 

Permeation tests measure the rate of at which a challenge chemical permeates through the membrane.
Principal factors affecting permeation include:

• Concentration gradient
• Molecular size and solubility of the challenge chemical
• Surface area, crystallinity and thickness the membrane

Following a soil analysis to determine the concentration for each contaminant, permeation data is used by the design engineer to evaluate the effectiveness of the barrier membrane and calculate its anticipated useful life.  

Test Data for Hydrocarbons and other Toxic Industrial Chemicals is available to Geotechnical Engineers and Environmental Consultants to evaluate Puraflex's suitability for a specific project.  Please contact our Technical Department for further details.