Multi Flex 1205

Description

MULTI FLEX 1205 is a milky white liquid additive for improving the waterproofing, adhesion, flow and flexibility of plasters, mortars and concrete. Contains a specialized acrylic emulsion polymer that is highly water resistant while imparting flexibility and outstanding adhesion properties to the mix, as well as adding to workability and flow.

Typical Applications

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

Floor screeds: waterproofing and adhesion enhancing properties to substrates. Underlay applications for vinyls 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
• Improved flexibility
• Doubling of tensile strength
• Reduced shrinkage
• Reduced bleeding
• Increased durability
• High resistance to water penetration
• Good chemical resistance
• Frost resistant
• Salt penetration resistant
• Good adhesion to steel and concrete (25 times greater)
• Adheres well to brick, glass, asphalt, wood and most building materials
• Prolonged corrosion protection
• Nontoxic – used in potable water tanks

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 FLEX 1205 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.

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 water and 1 part MULTI FLEX 1205 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 a thickness in excess of 2mm.

Materials for MULTI FLEX 1205, Modified Mixes

Sand: Should be sharp, washed, well-graded and free from excessive fines As per SABS 083 specifications for sands.

Cement: MULTI FLEX 1205 is compatible with all types of Normal Portland, Sulphate Resistant and High Alumina Cements. However, with High Alumina Cements, hardening will be delayed. For use with other cements consult MULTI CONSTRUCTION CHEMICALS (PTY) LTD

Water the strong plasticizing action of MULTI FLEX 1205 greatly reduces the water / cement ratio for a given workability

Standard Dose: 10 liters per 50kg cement. For more demanding situations, such as greater exposure to chemicals or wear. 15 liters per 50kg cement is recommended.

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 FLEX 1205 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 FLEX 1205, 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 FLEX 1205 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