MasterSeal 540 – Flexible, polymer cement waterproofing slurry

DESCRIPTION

MasterSeal 540 is a two-part, prepacked system, consisting of a liquid polymer as Part A and a premixed powder as Part B. The two parts, when mixed, yield a brushable, smooth slurry with excellent bond to most substrates. The product is based on selected synthetic resins and cements.

MasterSeal 540 is in compliance with Bureau Veritas Potability test for use in drinking water reservoirs or tanks.

Surface Spread of Flame test: BS 476:Pt.7:71 (passes Class 1)

RECOMMENDED USES

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

Waterproof coatings to the internal faces of water tanks, sumps, reservoirs, planter boxes, etc., before tiling or other surface finishing.

Treating terraces, balconies, kitchen and toilet floors as a sandwich treatment, to prevent water ingress.

Treating bridge and flyover decks before wearing course to protect concrete from rainwater ingress.

FEATURES AND BENEFITS

Polymer modified – Improved bond strength on a variety of substrates.

Permeable to water vapors – Allows surface to breathe, preventing build-up of moisture in the structure, reducing maintenance.

Flexible – Can withstand moderate movement of hairline cracks. Bridges cracks up to 0.3mm in width, reducing maintenance.

Weather resistant – Suitable for use in exposed conditions.

Brushable consistency – Easily applied by brush or spray.
Non-toxic – Can be applied onto surfaces in contact with drinking water

PERFORMANCE DATA

Criteria	Results
Pull off Bond Strength	~1MPa
Water Penetration (0.5kg/cm2)	< 0.1mm
Coefficient of permeability (3kgf/cm2)	2.27 x 10-13m/s
QUV Accelerated Weathering Test (ASTM G53:93, Type A)	Gray scale: 4-5 (1000 hours), 2-3 (2000 hours) (Gray Scale 1 denotes severe discoloration; 5 denotes mild or no discoloration.)
VOC	0.5 g/L

PROPERTIES

Characteristic	Part A	Part B
Supply Form	Liquid	Powder
Color	White	Grey
Working Time @ 20°C	1 hour (approx.)	0.5 hour (approx.)
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.

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. Allow to stand for 2-3 minutes and remix before application.

Placing

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. Curing by wet burlap, polyethylene sheet, or a curing compound such as MasterKure 181 or 128 is recommended.