Technical Data Sheet

DUSEAL CXL is a high quality self-adhesive SBS modified waterproofing sheet membrane reinforced with Polyester carrier to enhance the physical property. The self-adhesive bottom surface is laminated with Siliconized release foil or paper and the top surface of the membrane is laminated with a CXL special multi-layer polymeric foil. It is used for a variety of waterproofing and damp proofing applications where the requirements are rigorous.
The DUSEAL range belongs to the elastoseal group of membranes produced using a special grade of bitumen modified with virgin SBS polymer. The polymer-rich mixture is used to saturate and to coat both sides of polyester mat to the required thickness of the membrane.

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  • Used as a waterproofing membrane and vapor barrier.
  • Excellent bonding to vertical and horizontal surfaces.
  • Superior tensile properties.
  • Continuous at the seams.
  • Improved heat stability.
  • Good flexibility at low temperatures.
  • Excellent resistance to weather, and Ultra violet radiation.
  • Easy application.


DUSEAL CXL membranes are tested to ASTM, UEAtc and other relevant international standards.


Duproof is an ISO 9001 Quality Assured company, and all DUSEAL CXL membranes carry a material warranty against any manufacturing defects.


Thickness (mm) 1.5 1.6 1.8 2.0
Nominal weight Kg / m2 1.7 1.8 2.0 2.2
Dimensions (length x width) m 15 x 1
Top Surface —————- Special Multi-layer polymeric foil
Reinforcement g/m2 100 Polyester mat
Bottom Surface —————- Siliconized removable paper / foil

To order specify thickness e.g. DUSEAL CXL 1.6mm for 1.6mm thick self-adhesive sheet membrane.


  • Robust and ideal waterproofing and damp proofing membrane specially designed for concrete protection.
  • Applied as a damp proof course for tanking below ground structures, foundations, subways and retaining walls.
  • Used directly on thermal insulation boards (Expanded Polystyrene, Extruded Polystyrene)
  • Substructure waterproofing to foundations, footings, retaining walls, bridges, tunnels, manholes.
  • Under roof shingles in pitched roofs tiles in balconies, terraces, etc


Surfaces onto which the membrane is to be applied must sound, clean and dry. Dust, loose material and protrusions must be removed and cracks, holes etc made good.
Priming: Apply one coat of DUPRIME solvent based bituminous primer to all surfaces at 5-6 m2/lit and allow to dry. Primed surfaces must be covered within the same day. If left exposed for longer periods, clean and re-prime before applying the membrane
Membrane Application: Position, measure and cut the membrane carefully as required before installation. Starting from one end, remove the release film and unroll the membrane, pressing firmly by hand and/or roller from the top to ensure full bond with no air pockets. Maintain a minimum of 80mm side laps and 150mm end laps between rolls and stagger the joints where possible. Press and roll laps from top to ensure a continuous seal.
Protection: Once laid, the membrane must be protected from long-term exposure, construction abuse and backfill, preferably within 24 hours. On vertical areas Duproof DUBOARD protection boards is recommended; on horizontal surfaces a minimum 25 mm thick sand-cement screed may be used. Contact the technical department of your local distributor for advice.

DUSEAL CXL membranes are supplied in rolls 1m x 15m; shrink-wrapped on pallets. Keep rolls upright on pallets under shade. DUSEAL CXL pallets should not be stacked one over the other.


There are no direct health hazards associated with DUSEAL membranes. Normal precautions for hot and volatile substances should be observed during application. Refer to our MSDS sheets for advice.


Softening point [o C] ASTM D 36 110
Flexibility at low temperature [o C] DIN 52123 -15 to -20
Heat resistance, 2 hrs. @100 oC UEAtc No flow
Elongation (L/T) Compound % ASTM D 412 >1000
Tensile Strength Film (L/T) (N/mm2) ASTM D638 40/35
Elongation Film (L/T) % ASTM D 638 400/550

Note: Tolerances on nominal values shown are as per UEAtc directives for polymer modified bitumen membranes. These data are correct at the time of printing but may be changed without any prior notice subject to clients Requirements availability of raw materials or other conditions. This data sheet supersedes all previous Publications pertaining to this product. All reasonable care has been taken in preparing this document, which to the best of our knowledge is accurate and true. Recommendations and suggestions are made in good faith and should only be considered for general guidance. No liability is assumed or taken by us in relation to the application, as usage conditions and any labor involved are beyond our control.

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