1. Exceptional durability

The chemical composition of Firestone GeoGardTM EPDM 9high proportion of carbon black saturated carbon chains and the fact that it is vulcanized means that the geo-membrane benefits from an unmatched resistance to UV, heat, ozone, micro-organisms and extreme weather conditions.

The membrane does not contain any plasticizers or antioxidants likely to migrate or de-grade and cause the geomembrane to age prematurely.

Tests conducted on the Firestone GeoGardTM EPDM and the observations made on membranes exposed to actual weather conditions (exposure to water, UV, ozone, heat, thermal variations and microorganisms, etc.) over several years have shown that under normal exposure in Western Europe and when properly installed, Firestone GeoGardTM EPDM has a service life of more than 50 years, without any apparent sign of ageing such as cracks, crazing, bleaching, etc.

Standard Tests:

Standard 1.1 – 1.5 mm
Durability – weathering test (25 years) EN 12224 Pass
Durability – oxidation EN 14575 Pass
  1. High elasticity and tensile strength

Given the significant level of cross linking in its carbon chains, Firestone GeoGardTM EPDM can be elongated over 300% in all directions and return to its initial form afterwards.  This high elasticity allows Firestone GeoGardTM EPDM to absorb substrate movements without its physical properties being affected.

Standard Tests:

Standard 1.1 mm 1.5 mm Tolerance Unit
Tensile Strength ISO R 527 9 10 -1 N/mm2
Elongation at Break ISO R 527 ? 300 ? 300 %

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  1. Highly flexible, even at low temperatures

Firestone GeoGardTM EPDM is highly flexible even at low temperatures down to -45 0C.  This facilitates as the geomembrane adapts to irregular shapes and lays flat on the substrate, whatever the outside temperature.

When mechanically stressed at low temperatures, Firestone GeoGardTM EPDM retains all of its flexibility and its resistance is not jeopardized.

Standard Tests:

Standard 1.1 – 1.5 mm Unit
Foldability at low temperature) EN 495-5 ? -45 0C
  1. High puncture resistance

In view of its highly flexible and elastic nature.  Firestone GeoGardTM EPDM also provides excellent puncture resistance.  This is a very important characteristic in withstanding the mechanical stresses which the geomembrane sustains during installation and service and consequently guarantees long term water tightness of the lining system.

Standard Tests:

Standard 1.1 mm 1.5 mm Tolerance Unit
Resistance to static puncture EN ISO 12236 .7 .9 -0.1 kN
  1. High resistance to hydrostatic pressures

Firestone GeoGardTM EPDM has an almost unlimited resistance to hydrostatic pressure, which enables it to be used in deep, large capacity water reservoirs.  Firestone has conducted laboratory pressure tests which have shown that the EPDM geomembrance can withstand pressure up to 35 kg/cm2 (equivalent to 350 m water column or 3.4MPa)  Test carried our to the EN 1928:2000 standard showed that when an equivalent pressure of 40 m water column (400KPA) is applied.  Firestone GeoGardTM EPDM and its seams remain watertight.

Standard Tests:

Standard 1.1 – 1.5 mm + seams
Water tightness under high pressure EN 1928:2000 Watertight
  1. Stable chemical composition

As s result of its chemical composition (saturated highly cross linked carbon chains, without plasticizers and antioxidants) and its production method (heat vulcanized).  Firestone GeoGardTM EPDM is considered and inert material as its chemical composition is very suitable over time (when in contact with authorized products).

A stable chemical composition is vital in guaranteeing the mechanical properties of the geomembrane on a long term basis.

Unlike thermoplastic geomembranes, no reduction in density has been noted on Firestone GeoGardTM EPDM following loss of membrane components.

  1. Highly compatible with living organisms

Owing to its very stable chemical composition, Firestone GeoGardTM EPDM, does not release components on contact with water.

Tests have demonstrated that the Firestone GeoGardTM EPDM and its seaming system can be used for the storage of irrigation water, as a liner for aqueous food production and aquaculture and for the storage of water prior to the necessary treatment required for human consumption.

  1. Environmentally friendly geomembrane

Given the chemically inert nature of Firestone GeoGardTM EPDM, it has no effect on air or water quality and does not release any pollutants into the environment.

The environment impact of a geomembrane essentially takes place in its production and disposal.  Taking into account its exceptional durability (compared with other geomembranes) and the numerous possibilities for recycling, Firestone GeoGardTM EPDM offers an environmentally friendly solution.

  1. Root penetration resistance

Firestone GeoGardTM EPDM and its seams have successfully passed various root penetration resistance test (DIN 4062, CEN/TS 14416: 2005, FLL)  Nevertheless, it is necessary to remain extremely careful with regard to certain plants which develop particularly aggressive rhizomes (a non exhaustive list of plants which develop rhizomes can be obtained on request or from the website www.fbb.de).  When confronted with such plants which develop aggressive root systems or rhizomes, a protection barrier must be implemented to protect the EPDM geomembrane.

Standard Tests:

Standard 1.1 – 1.5 mm + seams
Resistance to root penetration CEN/TS 14416 Pass
  1. Broad range chemical resistance

Firestone GeoGardTM EPDM has a relatively broad spectrum chemical resistance.  Nevertheless,  some products are not compatible with EPDM membrance (hydrocarbons, grease, etc.)  A list of compatible chemical compounds is available on request.  In case of doubt, it is strongly advised to consult with the technical department of Firestone Building Products.

In Addition to water storage, Firestone GeoGardTM EPDM is also highly suitable for applications such as livestock effluent storage and waste water storage.  Firestone GeoGardTM EPDM must not under any circumstances be used for storing chemical products.

  1. Resistance to microorganism corrosion

The high level of crosslinking in its carbon chains and the presence of sulphur in its molecular structure (a compound which bacteria, likely to corrode the geomembrane, are not able to withstand), make Firestone GeoGardTM EPDM almost impervious to microorganism corrosion.

  1. High friction angle

Friction tests conducted on the EPDM geomembrane demonstrated that the friction angle between the geomembrane and a standardized ground surface is 27.5 (± 10).

Firestone GeoGardTM EPDM friction angle is relatively high compared with other geomembranes.  A high friction angle means that the geomembrance is easier to install (workers do not slide on it and the membrance stays in place); that it is more stable on the slopes and that it is nor necessary to use a textured membrance.

Standard Tests:

Standard 1.1 – 1.5 mm Tolerance Unit
Friction Angle EN ISO 12957-2 27.5 ± 1 0
  1. Quick and easy installation

The combination of its dimensions, mechanical characteristics and seaming method make Firestone GeoGardTM EPDM fast and easy to apply.  In a trade which is highly dependent on weather conditions, the speed of installation of Firestone GeoGardTM EPDM represents a major advantage.


Firestone GeoGardTM EPDM is available in large panel sizes, up to 15.25m wide and 61m long in a single piece, that works out to 930m2  without any seam.

This allows for a significant reduction in the number of seams to be carried out on site and considerably reduces the risks in installation.

The panels are available in numerous sizes, which can be selected to accommodate the dimensions of the project.  This reduces losses and limits the cutting and field seaming.

The list of available Firestone GeoGardTM EPDM panel sizes is included in the Technical information sheet (TIS).


Installation of Firestone GeoGardTM EPDM is greatly facilitated by its flexibility, as it adapts to the substrate and is easy to manipulate (moving unfolded sheets on an air cushion), and also by its high friction angle as workers do not slide on the membrane when it is dry and the membrane is less likely to slip on the slopes.

Field seaming method

Firestone GeoGardTM EPDM field seaming method using Firestone QuickSeamTM Splice Tape presents the following advantages:

  • The quality if the seams are consistent over the entire length.
  • Assembly is so easy that the quality of the seams is not dependent on the skill of the installer.
  • The completion of seams is only slightly dependent on weather conditions.
  • The tools used do not risk damaging the geomembrane
  • It does not require the use of electricity on special equipment.

The completion and quality of the seams are not affected by folds or waves which are likely to form with temperature variations.

  1. High quality installation details

For the sealing of pipe flashings and penetrations, Firestone uses Firestone QuickSeam FormFlash, an uncured EPDM flashing 9progressively cured after installation) laminated to self adhesive Firestone QuickSEam Splice Tape.  This material dresses each sealing detail perfectly and without any stress, whatever its shape.

Firestone also offers accessories for carrying out waterproof mechanical connections on concrete structures and adhesives which allows the membrane to be adhered to any type of surface 9concrete, wood, steel etc.).

  1. Quality installation

The performance of a lining system is directly linked to the quality of the installation.  For this reason Firestone GeoGardTM EPDM is exclusively installed by Firestone trained and lining constructors.  They guarantee that the installation meets the quality standards set by the manufacturer.

Firestone Building Products’ technical department offers its contractors first rate support in theoretical and practical training by professional technicians.  Firestone also provides on-site technical and quality inspection of finished works.

  1. Seam testing

There are 2 main types of seaming control methods which provide accurate information regarding the quality of the field seams:

  • Non-destuctive seam testing:
    • Visual inspection: in the case of Firestone GeoGardTM EPDM, a series of elements may be easily checked visually and which give a very good indication of the quality of the seams.
    • Air lance : enabales the watertightness of the seams to be checked on a continuous basis.
    • Vacuum chamber: enables inspection of individual points on field seams.
  • Destructive seam testing: tensile and peel tests conducted on seam samples at least 24 hours after a seam has been made.

A more detailed description of the seam testing methods is given in the Firestone Quality Assurance Plan (available on request).

  1. Easy to repair

Given the inert nature of Firestone GeoGardTM EPDM, its composition does not vary over time.  Consequently, the geomembrane can still be assembled and/or repaired many years after being installed and having been exposed to climatic elements.  All that is required is that the geomembrane is thoroughly cleaned before commencing the repair.

The installation techniques for repairs do not differ from the techniques for the initial installation of Firestone GeoGardTM EPDM.  Therefore, repairs are quick and easy to carry out.  The Firestone repair Gauide (available on request0 describes in detail the various repair operations.

  1. National and International Technical approvals


Firestone GeoGardTM EPDM has obtained CE marking, which proves that it meets current European requirements for health, safety, consumer protection and environment.   The Firestone GeoGardTM EPDM marked for the following applications:

  • EN 13361:  Construction of reservoirs and dams
  • EN 13362:  Construction of canals,
  • EN13492: Construction of liquid waste disposal sites, transfer stations or secondary containment.
  • EN 13493: Construction of solid waste storage and disposal sites

Firestone GeoGardTM EPDM manufacturing facilities also hold ISO 9001 14001 certification which reflect respectively Firestone’s commitment to quality and environmental management system.

Firestone GeoGardTM EPDM has been tested and certified by many national and international bodies (ex. French ASQUAL certification).

Within the context of these certifications, regular audits are conducted at Firestone Building Products’ factories to verify the production process, quality control monitoring and the quality of the end product.  Consequently, Firestone Building Products can guarantee that its EPDM geomembrane is of a consistently high quality.

The main approvals and certifications are summarized in the Technical Specification.

  1. Technical Information Sheet

Firestone GeoGardTM EPDM (1.1 & 1.5 mm)



The Firestone GeoGardTM EPDM 1.1 mm (.045”) and the 1.5mm liner (.060”) is a cured single-ply sysnthetic rubber membrane made of ethylene-propylene-diene terpolymer (EPDM).  It is available in a variety of panel sizes.  Depending on the dimensions of the liner, the waterproofing surface may be seamless (up to 930m2).  In other situations, seams can be made using a self-adhesive tape.

The Firestone GeoGardTM EPDM can be supplies in the following dimensions:

Thickness 1.1 mm (.045”) 1.5 mm (.60”)
Max. Surface 930.25m2 697.23m2
Length 30.5m – 61.0m 30.5m – 45.72m – 61.0m
Width          3.05m -6.10m – 7.62m – 9.15m -12.20m – 15.25m

Note: not all panel widths are available in all lengths.


Product:  allow the membrane to relax for approximately 30 minutes before splicing.

Substrate:  The substrate needs to be smooth, dry and free of sharp objects, oil, grease and other materials that may damage the membrane.


Install the Firestone GeoGardTM EPDM in accordance with current specifications and details.



The dimensions of the membrane are calculated to cover the base of the reservoir, slopes and anchor trenches, including seam overlaps.



Firestone GeoGardTM EPDM is a rubber material with the following properties:

Physical    *   Elastomeric membrane with a good combination of high elasticity and tensile strength

*   Retains its flexibility at low temperature (-450C)

*   Resists to temperature shocks up to 1300C

*   Excellent resistance to alkali rains

*   Excellent resistance to U.V. radiation and ozone concentration

*   Contact with some kind of oils, petroleum products, hot bitumen and grease must be avoided

Technical * Base                               synthetic rubber

*  Colour                            black

*  Solvents                         none

*  Solids (%)                      100

*  State                              cured

*  Storage                          Store the membrane in a dry place until use