MasterSeal 540 - Flexible, cementitious waterproofing
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
MasterSeal 540 is designed to be used as an effective
waterproofing membrane under tiles on a variety of substrates. Applications
Terraces and balconies
Internal and external laundries
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
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
Brushable consistency - easily applied by brush
Non-toxic - can be applied onto surfaces in
contact with drinking water. Approved AS/NZS 4020:2002 for contact with potable
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.)
Specific gravity: 1.4 kg/L
Application Temperature: >5 C
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.
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)
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.
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.
MasterSeal 540 must be protected against rapid drying due
to direct sun exposure, high temperatures or wind.
Clean tools using water and rags before the resin system
hardens. Hardened material can only be removed mechanically
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.
MasterSeal 540 is available in 25kg packs 10 kg of Part A
in a plastic container 15Kg or Part B in a paper bag
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