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Water Based Epoxy Ardex WPM 300:  

 

ARDEX WPM 300 (HydrEpoxy 300) Water Based Epoxy Membrane   

PRODUCT DESCRIPTION ARDEX WPM 300 (HydrEpoxy 300) is a two component water based epoxy polyamide membrane/barrier coating. Approved for use with potable (drinking) water, independent testing confirms conformity with the requirements of AS4020.2000 and BS6920.   

FEATURES/BENEFITS  

  • Non-flammable and negligible odour.
  • Can be applied to damp surfaces.
  • Can be safely applied to freshly laid hardened (green) concrete.
  • Conforms to requirements of the: Building Code of Australia as a waterproofing membrane.
  • Conforms to the requirements of: Australian standard 4020 - 2000 and British Standard 6920 for use in contact with potable water.
  • When applied directly to the substrate the cured membrane will withstand 250kPa of hydrostatic pressure which is equivalent to a 25 metre head of water.
  • When used wet on wet over ARDEX WPM 256 Bonding Bridge the cured membrane will withstand 400kPa of pressure which is equivalent to 40 metre head of water.
  • Can be overcoated using almost any decorative or industrial finishing paint.
  • Prevents rising damp and the formation of efflorescence when used as a single coat barrier coat.
  • Has excellent adhesion to most substrates including brick, masonry, concrete block, concrete, stone and timber.
  • Easy clean-up using water.  

TYPICAL APPLICATIONS  

  • As a low water vapour transmission coating in the building and construction industries and as a barrier/seal coating over freshly laid or damp concrete.
  • As a hydrostatic pressure resistant waterproofing membrane to prevent water seepage or dampness penetration through to the interior of walls and floors.
  • As a waterproofing barrier on the negative side in below grade surfaces such as basements, tunnels, liftwells, retaining walls and carparks.   
  • As a waterproofing membrane or barrier coating over freshly laid hardened (green) concrete, prior to the application of conventional levelling compounds, carpet and tile adhesives.
  • As a waterproofing membrane in tanking applications, including potable water containment.
  • As a barrier seal coating over damp, green or efflorescence producing concrete prior to overcoating with conventional building paints.  

LIMITATIONS  

  • Tiling can commence after 24 hours cure of ARDEX WPM 300 although should not exceed a maximum of five days. Installer is to ensure that there is no surface contamination during this period.
  • The product should be applied whilst the surface temperature is between 10-35oC. The product will cease to cure below 10oC. Curing time will also be adversely affected in situations where relative humidity is >85%.
  • In enclosed areas, ventilation must be provided during curing cycle to enable adequate evaporation of the water. Care should be taken when sandwiching adhesives between ARDEX WPM 300 (HydrEpoxy 300) and floor coverings to ensure the water vapour transmission of the covering is sufficient to allow the solvent to escape.
  • ARDEX WPM 300 (HydrEpoxy 300) is not classified as a trafficable membrane.  

BASIC APPLICATION INSTRUCTIONS

Surface preparation All surfaces to be treated must be structurally sound; and existing coatings, adhesives, efflorescence should be removed to achieve maximum bond strength and resistance to hydrostatic pressure. Surfaces must be cleaned free of dirt, grease, oil, or other surface contaminants.

Holes, non-structural cracks or other surface deformities should be filled with an ARDEX WPM 405 (Sheltercrete Additive), sand/cement mortar, WPM 300 epoxy mortar or ARDEX concrete repair systems and allowed to cure for 2-3 hours before coating is applied.   

Installation

Each component should be individually mixed to form a homogeneous  component.

Thoroughly mix the two components in the ratio of 1:1 by volume until a homogeneous blend is obtained. Only mix as much as may be used within the pot life and avoid excessive aeration during mixing.

When the product is to be applied to dry concrete it is advisable to wet the surface with a fine mist of water before application and allow to just surface dry   

Floors - Spread the material using a squeegee or stiff nylon broom to achieve coverage and finish using a long nap roller.

Walls -  Apply the product by roller or spray taking care to achieve required coverage.

Care must be taken to work the material into the surface to fill voids and avoid pinholing. A minimum of one coat for efflorescence and rising damp, two coats for waterproofing and waterproofing negative side walls is recommended and care should be taken to ensure uniformity of material and the required coverage is maintained. When finishing it is necessary to lay the material onto the surface and lightly finish to achieve the required dry film thickness per coat.

The final coverage rate for all surfaces should be a total of 1.5 square metres per litre (3.0 square metres per litre wet applied per coat) to achieve optimum properties. In the event that this coverage rate is not achieved in two coats, further coats should be applied to achieve a total uniform coverage rate of 1.5 square metres per litre.

Allow to cure for 24 hours before applying water based adhesives, mortars, levelling compounds, decorative coatings or other surface treatments. Care is necessary to ensure the waterproofing membrane coating is not damaged in any way during subsequent treatments.   

TILING APPLICATIONS

Substrates such as screeds and renders should be normally allowed to dry for 7 days prior to the fixing of ceramic tiles. Alternatively ARDEX WPM 300 can be applied in one coat by brush or roller application at a coverage rate of 3m2/L. Whilst the coat is wet, clean dry sand of 0.5mm diameter shall be broadcast over the surface at a rate of 700g/m2 to achieve at least 90% coverage. After overnight cure the excess sand shall be swept and vacuumed  from the surface.    

FLOORING APPLICATIONS Where concrete subfloors are damp (moisture content exceeds 5.5% or have a relative humidity of 70%) ARDEX WPM 300 can be applied as a moisture barrier. Two coats are applied at 3.0 square metres per litre per coat. The second coat can be sand seeded as is done for tile applications, or left neat and ARDEX P 82 primer applied before the smoothing cement. A single coat of ARDEX WPM 300 applied at 2.5 square metres per litre per coat acts as a moisture stop for green concrete not subject to rising damp or permanent moisture.   

PACKAGING:   4L kit, 20L kit   

SAFETY PRECAUTIONS

ARDEX WPM 300 is hazardous and may cause sensitisation by skin contact. Keep containers in a well ventilated place and tightly closed. Take off immediately all contaminated clothing. In case of eye contact, rinse with plenty of water and contact Doctor or Poisons Information Centre. If swallowed immediately contact Doctor or Poisons Information Centre. Avoid release to the environment. ADDITIONAL INFORMATION IS LISTED IN THE MATERIAL SAFETY DATA SHEET.   

THINNING AND CLEAN UP

The first coat should be thinned with water, as required depending on the porosity of the surface to be coated (up to 20% for dense surface to 5% for more porous surfaces) to ensure optimum penetration. Thinning of the second coat should be avoided since this increases the difficulty in achieving the required dry film thickness. Wash all equipment in water or water/detergent immediately on completion.   

TECHNICAL PERFORMANCE DATA  

  • Colour Grey, Black
  • Finish Semi-gloss going to matt with aging
  • Volume solids 44%
  • Mixing ratio 1:1 (Part A:/Part B) by volume
  • Coverage Must be applied at a rate of 1.5 square metres per litre (3.0 square metres per litre per coat) to achieve an effective waterproofing membrane
  • Wet film thickness 300 micrometers (0.3mm) per coat
  • Recoat time 4 hours @ 25oC and 50% R.H.
  • Full cure 7 days @ 25oC and 50% R.H.
  • Pot life 2 hours @ 25oC 1 hour @ 35oC 

VOC content 26g/L The recommended wet film thickness specified produces a nominal dry film thickness of 150 micrometers (0.15mm) per coat or 300 micrometers (0.3mm) for two coats. The apparent dry film thickness will reduce depending on the porosity of the substrate, however the product absorbed by the substrate forms part of the waterproofing function

 

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