Product Data Sheet Show all documents

SikaLatex®-141

(former MasterCast® 141)

WATER RESISTANT BONDING AGENT AND MORTAR ADMIXTURE

SikaLatex®-141 is a (SBR) styrene-butadiene co-polymer latex specifically designed for use with cement compositions. It is used in mortar and concretes as an admixture to increase resistance to water penetration, improve abrasion resistance and durability. It is used with cement as a reliable water-resistant bonding agent. The use of SikaLatex®-141 synthetic latex in cement-based slurries and mortars compensates for many deficiencies in the mixes without detracting from their inherent strength and properties. 
SikaLatex®-141 has been developed specifically for use with Portland cements. As ordinary mortar dries out, voids are left which make it permeable and weaker. When SikaLatex®-141 is added, the SikaLatex®-141 particles bind together to form continuous films and strands - these stitch the opposite sides of the voids together and block up the spaces, increasing strength and resistance to water penetration. SikaLatex®-141 combined with cement produces an excellent adhesive; each component compliments the properties of the other in this respect. Suitable for use in hot and tropical climatic conditions.

  • Earlier hardening.
  • Improved flexibility.
  • Reduced shrinkage.
  • Prevents bleeding.
  • Lower water-cement ratio.
  • Increased durability and toughness.
  • Resistance to water penetration.
  • Good abrasion resistance.
  • Good frost resistance and resistance to salt permeation.
  • Good resistance to many chemicals and to mineral oil.
  • Excellent adhesion to steel and concrete. Adheres well to brick, glass, asphalt, wood, expanded polystyrene and most building materials.
  • Prolonged corrosion protection.
  • Similar thermal expansion and modulus properties to concrete (unlike resin mortars and primers).
  • Non-toxic.
  • More economical than epoxy or polyester resin mortar.
 
Product Data Sheet Show all documents

Usage

  • Concrete repair.
  • Floor screeds and toppings.
  • External rendering.
  • Waterproofing and tanking.
  • Fixing slip bricks and tiles.
  • Corrosion protection of steel.
  Concrete repair:
Spalled concrete, repairing floors, beams and precast slabs.
Floor screeds and toppings:
Abrasion resistant and non-dusting floors, underlay for special finishes, mild chemical, and effluent-resistant floors.
External rendering:
Waterproof, weatherproof and frost resistant render.
Waterproofing and tanking:
Basements, lift pits, inspection pits, water towers, liquid tanks. Effluent tanks and swimming pools. Other typical applications:
Bedding tiles, fixing or re-fixing slip bricks, bonding new concrete to old.

Advantages

  • Earlier hardening.
  • Improved flexibility.
  • Reduced shrinkage.
  • Prevents bleeding.
  • Lower water-cement ratio.
  • Increased durability and toughness.
  • Resistance to water penetration.
  • Good abrasion resistance.
  • Good frost resistance and resistance to salt permeation.
  • Good resistance to many chemicals and to mineral oil.
  • Excellent adhesion to steel and concrete. Adheres well to brick, glass, asphalt, wood, expanded polystyrene and most building materials.
  • Prolonged corrosion protection.
  • Similar thermal expansion and modulus properties to concrete (unlike resin mortars and primers).
  • Non-toxic.
  • More economical than epoxy or polyester resin mortar.
 

Packaging

20 L cans, drums and 1,000 L flowbin

Colour

Milky, white liquid

Product Details

Product Information

Composition

Styrene and butadiene by high pressure emulsion polymerisation. The latex consists of microscopic particles of synthetic rubber dispersed in an aqueous solution. SikaLatex®-141 modified mixes may be slightly darker than corresponding unmodified mixes.

Shelf life

12 months from date of production if stored properly

Storage conditions

Store properly in undamaged original sealed packaging, in dry cool conditions at temperatures between 5°C and 30°C. Protect from direct sunlight, contamination and moisture.

Density

~1.02 kg/l

Total chloride ion content

≤ 0.1 %
Technical Information

Indicative performance of mortar mix

Unless otherwise stated typical properties are based on a 3:1 sand/cement mix in which 10 L of SikaLatex®-141 per 50 kg of Type I OPC cement has been incorporated.

Compressive strength

40 N/mm² dependent on cement used and workability

Freeze thaw resistance

Excellent

Water Vapour premeability

< 4gm/m²/24hr, through an 11 mm thick test piece.

AdhesionExcellent to concrete, steel, brick, glass, etc
Co-efficient of thermal expansion-20°C to +20°C: 12.8 x 10-6                   -20°C to +60°C: 12.9 x 10-6
Chemical resistanceResists mild acids, alkalis, sulphates, chlorides, urine, dung, lactic acid, sugar, etc.
Resistance to water under pressure – 30m headExcellent - no water through a 15mm thick test piece

Curing conditions

Correct curing of SikaLatex®-141 modified mixes is important. Moisture cure for 24 hours and then allow to dry out slowly. (Note that initial curing is necessary to provide good curing conditions for the hydration of the Portland cement, then the Iatex mortar must be allowed to dry out to permit the latex particles to join to form the continuous films and strands.)

Application

Application Information

Compatibility

SikaLatex®-141 is specifically designed for use with Portland cements. It is also compatible with sulphate-resisting cement, Types II and V. Lime (more than 10 % cement weight), air entraining agents and masonry cement must not be used in conjunction with SikaLatex®-141.

For use with other cements, please consult our Sika Technical Department.
Consumption

Recommended dosage

For all normal use, the standard dose of 5 L of SikaLatex®-141 per 50 kg cement is adequate.

For extreme conditions and/or when adhesion, waterproofing, water vapour resistance or chemical resistance are critical, the dosage should be increased to 10 L of SikaLatex®-141 per 50 kg cement. For this higher dosage, the extra water addition required is low and the use of wet aggregate may result in excessive workability.
Application steps

MIXING

Mix SikaLatex®-141 with the correct amount of water to produce a gauging solution.
Pour part of the gauging solution into a suitable mixing container. While stirring slowly, add the cements and mix to the gauging solution and mix thoroughly until a smooth, uniform and lump-free mix is achieved.
Within the mixing time add additional gauging solution to adjust to the desired consistency.

For use as a bonding slurry or waterproof coating mixing is best achieved using a slow speed drill and paddle. Hand mixing is only permissible when the total weight of the mix is less than 25 kg. Prepare a bonding slurry of 1½ to 2 parts cement to 1-part SikaLatex®-141, mixed to a lumpfree creamy, consistency.
For renders, repair mortars, and floor screeds and similar aggregate or sand filled mortars, mixing should be in an efficient concrete mixer preferably a pan type mixer. Charge the mixer with the required quantity of sand, aggregate and cement and premix for approx. 1 minute. Add the SikaLatex®-141 and mix for 2 minutes only, to avoid excessive air entrapment. Then add the water slowly until the required consistency is achieved (avoid adding excessive water). 

CLEANING OF EQUIPMENT

All tools should be cleaned with water immediately after use. If delayed, use of soap and coarse wire wool may help. Solvents such as white spirit can be used to remove partially hardened mortar.

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