dulas AP

Technical Data Sheet

DULAS AP is a high quality polymer-rich SBS modified bituminous torch-on membrane with a reinforcement core of spun-bound non-woven polyester mat, used as a capping layer in waterproofing system.The DULAS range belongs to the Elastoproof group of membranes produced using a special grade of bitumen modified with virgin SBS polymer. The polymer-rich mixture is used to saturate and coat both sides of the polyester mat to the required thickness of the membranes. The top surface of the membrane is laminated with a high quality aluminum foil, which protects the membrane from weathering, UV rays and the bottom surface covered by torchable polyethylene foil.


  • High mechanical properties: good movement accommodation; resistant to tear and puncture
  • High resistance to hydraulic pressure: provides an impermeable and low absorption layer.
  • Wide temperature tolerance: stable in tropical climates; resistant to thermal ageing and shock.
  • High chemical resistance: withstands effects of salts and other corrosive agents in soil and water.
  • Versatile: available with a range of reinforcements, thickness and surface finishes for use in variety of applications.
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DULAS AP membranes are tested in accordance with UEAtc(European union for technical agreement for construction industry) and can be tested as per ASTM D5147 (Standard Test Method), ASTM D6164 (Standard Specification) and other relevant international standards.


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


Nominal weightKg / m23.54.55.5
Dimensions    length X width[m]10 X 1
CoatingSBS – modified bitumen
Type of carrierSpun bond Polyester 180/200/250 g/m² polyester mat
TopAlkali proof Aluminum foil.
BottomPrinted Polyethylene foil

To order specify finish, reinforcement and thickness e.g. DULAS AP-180 4mm for 180g/m² polyester reinforcement and 4mm thick sheet membrane with Alkali proof Aluminum foil on the top.


  • As a capping layer in waterproofing systems.
  • Where reflectivity is required.
  • As a base flashing over the parapet.


Surfaces onto which the membrane is to be applied must be 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 the rolls carefully with the correct orientation before the torching operation begins. Heat the lower surface of the rolls with a propane gas torch and unroll as the bitumen begins to melt. Maintain minimum 100 mm side laps and 150 mm end laps between rolls, staggering the joints where possible. All seams must be heat sealed from the top to ensure watertight laps.


DULAS AP membranes are supplied in rolls of 1mX10m, shrink wrapped on pallets. Rolls must be kept upright on pallets under shade. DULAS AP pallets should not be stacked one over the other.


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


Softening point[° C]ASTM D 36120
Penetration, @ 250CdmmASTM D 525-35
Heat resistance, 2 hrs. @1000C——-UEAtcNo flow
Flexibility at low temperature[° C]DIN 52123-5 to -10
Water absorption%ASTM D 570<0.4
Type of carrierg/m2180 (Spun bond Polyester mat)
Tensile strength  (L/T)[N / 5 cm]UEAtc750 / 650
Elongation  (L/T)[%]UEAtc40/45
Tear resistance (L/T)NUEAtc220/235
Puncture resistance              Static


———UEAtcLStatic @ 25 Kg

I3 Dynamic @ 9 Joules

Note: 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 supercedes all previous publications pertaining to this product. All reasonable care has been taken in preparing this document which to the best 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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