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Flexible Cementitious waterproofing membrane :


MasterSeal 540 - Flexible, cementitious waterproofing membrane 

DESCRIPTION 

MasterSeal 540 is a two component flexible cementitious waterproof membrane ideal for use under tiles. MasterSeal 540 provides toughness and tensile strength through integral fibre reinforcement. Advanced acrylic polymers combined with cements and special fine fillers achieve an excellent flexible waterproof membrane barrier particularly suited for under tile. 

RECOMMENDED USES 

MasterSeal 540 is designed to be used as an effective waterproofing membrane under tiles on a variety of substrates. Applications include:

  • Terraces and balconies
  • Internal and external laundries
  • Commercial kitchens
  • Other incidental internal wet areas

 

MasterSeal 540 is also suitable as a membrane for lining concrete tanks to be used for potable water. Also suitable for collection tanks for grey water.  

FEATURES AND BENEFITS  

  • Polymer modified - improved bond strength on a variety of substrates concrete, wallboard, cement sheeting, masonry, plywood and particleboard.
  • Permeable to water vapours - allows surface to breath, preventing buildup of moisture in structure, reducing maintenance.
  • Flexible - can withstand moderate movement of hairline cracks. Bridges cracks up to 1mm in width, reducing maintenance.
  • Flexible to minus 5 C - suitable for use at low temperatures.
  • Brushable consistency - easily applied by brush or spray.
  • Non-toxic - can be applied onto surfaces in contact with drinking water. Approved AS/NZS 4020:2002 for contact with potable water

 

PROPERTIES

  • Pull off bond strength: ~ 1.5 MPa
  • Water penetration: (0.5kg/cm2) < 0.1mm
  • Elongation at tear: >100%
  • Bridging of existing cracks: Up to 1mm @ 20 C  
  • Supply Form: Part A liquid Part B power
  • Colour: Grey, White
  • Working Time: 1 hour (approx.) @20 C, 0.5 hour (approx.) @30 C
  • Specific gravity: 1.4 kg/L
  • Application Temperature: >5 C  

 

APPLICATION  

Surface Preparation  

Correct substrate preparation is critical for optimum performance. Surfaces should be structurally sound direct tensile strength of more than 1.5MPa via a pull off tester with a load rate of 100N/s), clean, and free from laitance, loose particles, oil and grease, old coatings, curing compounds or any other contaminants. Remove oil or grease and wax contaminants by scrubbing with industrial grade detergent or degreasing compounds before mechanical preparation. Cement laitance, loose particles, mold release agents, curing membranes and other contaminants must be removed from the surface by shot-blasting, grinding or scarifying followed by vacuum cleaning. Prior to priming use MasterEmaco repair mortars to achieve a smooth and level surface by filling holes and irregularities.  

Priming

Apply 1 coat of MasterEmaco P 157 to a clean substrate by roller or brush at 7 to 10 m2 per litre depending on substrate. Allow MasterEmaco P 157 to dry before application of Masterseal 540. (Approximately 15 to 30 minutes depending on temperature and porosity of substrate)  

Mixing

Mechanical mixing is necessary. A slow speed (300 rpm), heavy duty electric drill with a wing type paddle is recommended. Place approx. 75% of Part A of the pack in a clean pail. Keeping the mixer running, add the Part B slowly. Mix for at least 3 minutes to get a lump-free homogenous mix. While continuing to mix, add all of the remainder of Part A if applying on a horizontal surface, or a part of it if applying on vertical surfaces till the required consistency is obtained.

Placing

Use of MasterSeal tapes: For detailed instructions consult the application guide for "MasterSeal jointing tapes". Treat the wall-wall joints and floor-wall joints and corners with the MasterSeal 950/960/970 tape by embedding the tapes fabric side down into a stripe of the membrane along the joint. Install corners first then the tape and then overcoat the exposed fabric to encapsulate the tape. Apply the membrane to walls and floors as required. It is not necessary to completely cover the tape but this does not create any issue either. Allow membrane to cure overnight. It is extremely important that the area being treated is shaded from direct sun and wind to prevent rapid drying of the coating.  

CURING  

MasterSeal 540 must be protected against rapid drying due to direct sun exposure, high temperatures or wind.  

CLEANING  

Clean tools using water and rags before the resin system hardens. Hardened material can only be removed mechanically  

ESTIMATING DATA  

The recommended coverage of MasterSeal 540 is 2 L/m2 per coat to obtain an approximate wet film thickness of 2 mm. Each kit of MasterSeal 540 yields 18 litres. Actual coverage depends upon the method of application, the texture and porosity of the surface. Therefore material requirement is approximately 2 kg/m2 for a total dry film thickness of 1 mm (+/- 0.1mm) in two coatings. Note: use only complete packs.  

PACKAGING  

MasterSeal 540 is available in 25kg packs 10 kg of Part A in a plastic container 15Kg or Part B in a paper bag  

SHELF LIFE  

MasterSeal 540 can be kept for 12 months in original unopened packing when stored indoors. Do not store in direct sunlight and avoid allowing the material to freeze which will render the material unusable.


 

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