Multi Latex

Description

MULTI LATEX is a milky white liquid additive for improving the waterproofing, adhesion and flexibility of mortars and concrete. Contains styrene and butadiene by high pressure emulsion polymerization. The microscopic particles of synthetic rubber are dispersed in an aqueous solution.

Typical Applications

Concrete repair: Spalled concrete, repairing floors, beams and precast slabs.

Floor screeds: waterproofing and adhesion enhancing properties to substrates. Underlay applications for vinyl’s and laminates. Effluent resistant screeds.

Wall rendering for waterproofing, flexibility, frost resistance and adhesion onto substrates.

Water holding areas such as tanks, pits, water towers, basements, effluent tanks and swimming pools.

Advantages

• Earlier hardening and Greatly improved flexibility
• Tensile strength normally doubled
• Reduced shrinkage
• Good abrasion resistance
• Reduces bleeding
• Increased durability and toughness
• High resistance to water penetration
• Good resistance to many chemicals and to mineral Oil
• Good resistance to frost attack
• Good resistance to salt permeation
• Excellent adhesion to steel and concrete
• Prolonged corrosion protection
• Similar thermal expansion and modulus properties to concrete (unlike resin mortars and primers)
• Non-toxic. Can be used with potable water
• Increases freeze I thaw resistance
  Typical Properties

Watch Points

• Always use fresh cement and a well-graded aggregate free of excessive fines.
• Keep mixing time to a minimum .
• Avoid using excess water.
• Never apply MULTI LATEX or concrete to a bonding slurry that has been allowed to dry out. Troweling should proceed with the work. Do not over trowel and avoid re-troweling. Protect from too rapid drying out prior to troweling.
• Rapid Hardening Cement should be used in cold weather conditions.
• Exposure to intense lighting or direct sunlight will produce discolouration in time

Directions for Use

Surface Preparation:

Surfaces should be clean, sound and free of deleterious substances. Remove all laitance, oil. grease, mould oil or curing compound from concrete surfaces using wire brush, bush hammer, scabbler or other plant as appropriate. Ensure that reinforcing steel is clean and free from grease or oil. Remove scale and rust. When repairing spalled or damaged concrete, ensure that the concrete has been cut back to thoroughly sound material.

Bonding Slurry:

Wet down absorbent surfaces such as concrete, brick, stone, etc. ensuring that they are saturated but free of surface water. Prepare a bonding slurry of 3 parts cement to 1-part MULTI LATEX and 1-part water mixed to a lump-free creamy consistency. Using a stiff brush, work the bonding slurry well into the damp surface ensuring that no pinholes are visible. Do not apply bonding slurry at thickness in excess of 2mm.

Application:

Mixing should preferably be carried out in an efficient concrete mixer. A pan type mixer is recommended. Hand batching is permissible when the total weight of the mix is less than 25 kg. Charge the mixer with the required quantity of sand and cement and premix for approximately 1 minute. Pour in the desired quantity of MULTI LATEX and mix for maximum 2 minutes, to avoid excessive air entertainment. Finally add the water until the required consistency is achieved. Owing to the strong plasticizing properties of MULTI LATEX, rapid thinning can occur - avoid adding excessive water. Moisture cure for at least 1 day and then allow to dry out slowly

Vertical Surfaces:

Apply the bonding slurry to the prepared surface and then render immediately with MULTI LATEX modified mortars in coats to a maximum thickness of 6mm per coat, as greater thicknesses can lead to slumping. However, several coats can be applied in rapid succession usually within 15 to 30 minutes, Thicker coatings can be applied providing formwork is used. Close the surface using a wooden float or steel.

Equipment Care

Clean all equipment immediately after use with water.

Packing

Supplied in 5Lt and 25LT polycans

Quality Assurance

Multi Construction Chemicals South Africa (PTY) Ltd production and testing programs comply with all local and international testing standards.

REVISION: 3.1