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Industrial Textiles
& Plastics Ltd

Stillington Road, Easingwold,
York YO61 3FA
United Kingdom

T: +44 1347 825200
F: +44 1347 825222

 

Hydrocarbon Resistant Barrier Membrane

Protection against hydrocarbons & toxic industrial chemical contaminants

Designed specifically for the remediation of contaminated land, water resources and groundwater protection, environmental protection and secondary containment installations. Puraflex has exceptional resistance to a wide range of pollutants including hydrocarbons, industrial chemicals, and toxic waste, natural and radioactive gases. 

Manufactured using the latest extrusion technology, advances in material science have enabled ITP to develop an innovative and complex polymeric membrane.

The material has been subjected to an intensive test programme on identified environmental contaminants.  Our data is the result of chemical resistance immersion and permeation testing to both industry standard test methods and enhanced proprietary test methods. 

Installed using conventional thermal welding equipment, it is classed as a GBR-P polymeric geosynthetic barrier for covered installations. Puraflex provides an exceptional level of containment and steadfast environmental protection. 

Puraflex Hydrocarbon Resistant Barrier

  • 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 Installation
  • We recommend that installers should be Accredited to EN 13067 
  • Rapid and safe installation using conventional thermal hot air wedge welding equipment
  • 4m per minute at ambient temperatures
  • Detailed Installation Instructions are available as a Download to Registered Users or by contacting our Technical Department

 

Puraflex Chemical Resistance Testing

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

Test Method

Chemical Challenge

Result

EN 14414 A

EN 14414 B

EN 14414 C

EN 14414 D

EN 14415 A

EN 14415 B

EN 14415 C

Acids

Alkalis

Hydrocarbons

Leachates

Hot Water

Aqueous Alkaline (Calcium Hydroxide)

Organic Alcohols

PASS

PASS

PASS

PASS

PASS

PASS

PASS

Independently tested by accredited test laboratories

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.  

Group

Chemical

CAS Number

TPH - Aliphatics

Cyclohexane

Diesel Fuel

Hexane

Jet Fuel

Petrol / Gasoline

White Mineral Oil

110-82-7

DIN 14214

110-54-3

Jet A1

DIN 51635

NA
TPH - Aromatics

1.1-Biphenyl

Anthracene (PAH)

Acenaphthene (PAH)

Benzene (BTEX)

Benzo(a)anthracene (PAH)

Benzo(a)pyrene (PAH)

Benzo(b)fluoroanthene (PAH)

Benzo(ghi)perylene (PAH)

Benzo(k)fluoroanthene (PAH)

Chrysene (PAH)

Dibenzo(ah)anthracene (PAH)

Ethylbenzene (BTEX)

Fluoranthene (PAH)

Fluorene (PAH)

Idendo(1.2.3-cd)pyrene (PAH)

Isopropyl Benzine

Naphthalene (PAH)

Pyrene (PAH)

Styrene

Toluene (BTEX)

Xylene (BTEX)

92-52-4

120-12-7

83-32-9

71-43-2

56-55-3

50-32-8

205-99-2

191-24-2

207-08-9

218-01-9

53-70-3

100-41-4

206-44-0

86-73-7

193-39-5

98-82-8

91-20-3

129-00-0

100-42-5

108-88-3

1330-20-7

Halogenated Hydrocarbons

1.1.1.2-Tetrachloroethane

1.1.2.2-Tetrachloroethane

1.1.1-Trichloroethane

1.2-Dibromoethane

1.2-Dichloroethane

1.2.4-Trichlorobenzene

Carbon Tetrachloride

Chlorobenzene (VOC)

Chlorotoluene

Chloroform

Dioxins and Furans

Hexachlorobuta-1,3-diene

Pentachlorobenzene

Pentachlorophenol

Polychlorinated biphenyls

Tetrachlorobenzene

Tetrachloroethylene

Trichloroethene (VOC)

Vinyl Chloride (VOC)

630-20-6

79-34-5

71-55-6

106-93-4

107-06-2

120-82-1

56-23-5

108-90-7

95-49-8

67-66-3

NA

87-68-3

608-93-5

87-86-5

NA

95-94-3

127-18-4

79-01-6

75-01-4
Other Chemicals

Methyl-tert-butyl-ether

Phenol

Carbon Disulphide

Cyanides

Carbon dioxide

Methane

Radon

1634-04-4

108-95-2

75-15-0

NA

124-38-9

74-82-8

10043-92-2

 

BTEX - Benzene, Toluene, Ethylbenzene
          & Xylenes
PAH  - Polycyclic Aromatic Hydrocarbons

TPH  - Total Petroleum Hydrocarbons
VOC  - Volatile Organic Compound

 

  

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.

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