SikaLatex® SBR
Superior performance SBR based multipurpose polymer for waterproofing, repair and bonding
SikaLatex® SBR is a superior modified styrene butadiene emulsion to be mixed with cement slurry, cement mortar, concrete or cementitious grout for improved adhesion and water resistance properties. It is fully soluble in water and is added directly to the gauging water of slurry, mortar, concrete or grout.
- Multipurpose 5-in-1 application
- Makes the mortar waterproof
- Improves resistance to salt permeation
Usage
SikaLatex® SBR is used as bonding agent, waterproof coating and site-mix mortar admixture for the following applications:
- Bonding of rendering and coating layers
- Bonding between successive concrete casts
- Cement grouting and screeds
- Polymer modified repair mortars
- Masonry mortars
- Renders
- Tile fixing and panelling
- Waterproof plastering
Packaging
250 g, 500 g, 1 kg, 5 kg, 10 kg, 20 kg, 100 kg container
Advantages
- Multipurpose 5-in-1 application
- Makes the mortar waterproof
- Improves resistance to salt permeation
- Improves toughness and flexibility and reduces cracking
- Good adhesion to substrates like concrete, stone, brick etc.
- Reduces viscosity of cement injection grout and improves bond of cured injected materials with substrates
- Dilute with water up to 6 times depending on the type of application
- Reduces surface dusting of concrete
- Improves chemical resistance of concrete
- Improves frost resistance
- Good resistance to water and water vapour
- Reduces water cement ratio for equivalent workability
- Mixes may be applied in much thinner sections
Colour
Liquid / Milky white
Product Details
Chemical base
Styrene butadiene rubber (latex) emulsion
Shelf life
18 months from date of production
Storage conditions
The product must be stored properly in undamaged and unopened original sealed packaging, in dry conditions at temperatures between +5 °C and +35 °C. Protect from frost and direct sunlight.
Specific gravity
~1.02
pH-value
8 ± 1
Tensile adhesion strength
≥ 1.5 N/mm2 (concrete failure) | (EN 1542) |
Application
Ambient air temperature
+5 °C min. / +40 °C max.
Substrate temperature
+5 °C min. / +40 °C max.
Application time
~20 to 30 minutes at +30 °C when used as coating, mortar or bonding agent
Consumption
| Application area | Mixing ratio (by weight) | Consumption of mixture | Consumption of SikaLatex® SBR |
Waterproof coating | SikaLatex® SBR : Water : Cement = 1 : 4 : 8 | ~900 g/m2 in 2 coats | ~70 g/m2 in 2 coats |
| Bonding coat | SikaLatex® SBR : Water : Cement = 1 : 4 : 8 | ~350 g/m2 in single coat | ~30 g/m2 |
| Polymer mortar or Waterproof plaster | SikaLatex® SBR : Water : Cement : Sand = 1 : 4 : 8 : 32 | ~2000 kg/m3 | ~45 g/m2 per mm thickness |
| Polymer concrete or Screed | SikaLatex® SBR : Water = 1 : 5 (Cement, sand, aggregate as per grade) | ~2300 kg/m3 | ~10 % by weight of cement |
| Polymer cement injection grout | SikaLatex® SBR : Water = 1 : 7(Cement, sand, aggregate as per grade) | ~1700 kg/m3 | ~7 % by weight of cement |
NOTE:
The above stated consumption depends on substrate condition, porosity, level, application skills and mixing ratios. Mix consistency may change with the quality of sand and cement, hence gauging water may be adjusted slightly based on site conditions. SikaLatex® SBR may also be used for applications such as masonry jointing or crack filling, etc. Please consult Sika Technical Services for consumption and mixing ratio information. Additional plasticising admixture may be necessary for concrete, screed or grouting applications to maintain desired workability.
SUBSTRATE QUALITY
- The substrate shall be sound, clean, homogeneous, free from oils and grease.
SUBSTRATE PREPARATION
- Dust, loose or friable particles, rust, scale, paint, cement laitance, old coatings and any other contaminants or deleterious materials which reduces bond or contributes to corrosion shall be removed by suitable means before application.
- Smooth substrates must be mechanically roughened by scabbling, needle gun or grit blasting to provide an adequate key.
- Cementitious substrates should be pre-saturated surface dry (SSD) with clean water at least 2 hours before any application.
MIXING
- Mix SikaLatex® SBR 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 cement or cement-sand 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. Mix either by hand or with a low speed drill for not more than 2 minutes.
NOTE:
- When a concrete-mixer is used, pour the mortar as soon as its consistency is cohesive. Do not run the mixer too long.
APPLICATION
IMPORTANT
Avoid application in direct sun and/or strong wind.
IMPORTANT
Protect freshly applied material from rain etc.
IMPORTANT
During application, the mixture of SikaLatex® SBR and cement needs to be continuously stirred to prevent the cement particles from settling.
Waterproofing coating
- Thoroughly pre-wet the prepared substrate. Keep the surface wet and do not allow to dry.
- Before application remove excess water e.g. with a clean sponge. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.
- Prepare the waterproofing coating as indicated in the consumption table. Using a stiff clean brush spread the coating vigorously onto the substrate, forming a thin layer.
- After 2 to 6 hours, apply the second coat in crosswise direction to first coat. Standard coating system can be further reinforced by placing glass fabric layer Sika® Fabric-50 in between first and second coat.
- Protect with screed on top for longer life.
NOTE:
- In areas of severe water penetration, three coats might be required.
Bonding coat
IMPORTANT
Never use pure SikaLatex® SBR or SikaLatex® SBR-water mix directly onto the substrate as bonding agent, always add cement and sand to the mix.
- Thoroughly pre-wet the prepared substrate. Keep the surface wet and do not allow to dry.
- Before application remove excess water e.g. with a clean sponge. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.
- Prepare the bonding coat as indicated in the consumption table. Using a stiff clean brush work the mix vigorously onto the substrate, forming a thin layer filling all unevenness, pits and pores.
- When the bond coat is still fresh and sticky, apply the mortar or concrete. Vibrate carefully to achieve satisfactory interpenetration of mortar and concrete.
Polymer mortar or Waterproof plaster
- Prepare the polymer mortar as indicated in the consumption table.
- Apply a thin layer of polymer mortar as given above.
- Apply the mortar onto the surface in a layer of max. 20 mm thickness.
- Cured mortar or plaster with SikaLatex® SBR would harden faster and would be watertight. For higher thickness, apply in multiple layers at intervals of 12 hours.
Polymer concrete or Screed
- Thoroughly pre-wet the prepared substrate. Keep the surface wet and do not allow to dry.
- Before application remove excess water e.g. with a clean sponge. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.
- Prepare the bonding coat as indicated in the consumption table. Using a stiff clean brush work the mix vigorously onto the substrate, forming a thin layer filling all unevenness, pits and pores.
- Prepare the concrete or screed as indicated in the consumption table. When the bond coat is still fresh and sticky, apply the concrete. Vibrate carefully to achieve satisfactory interpenetration concrete or screed.
Polymer cement injection grout
- Open the crack lines to form a V groove of ~10 mm.
- Seal the cracks with Sika MonoTop®-108 Water Plug IN mortar or Sikadur®-31 IN.
- Fix appropriate nozzles spaced at regular intervals along groove length with Sika MonoTop®-108 Water Plug IN mortar or Sikadur®-31 IN.
- Prepare a cement grout slurry as indicated in the consumption table.
- Inject the grout as per standard grouting practice.
CURING TREATMENT
- Avoid rapid evaporation of the water from mortars prepared with SikaLatex® SBR. Cover the surface with a polyethylene film, use wet burlap, gunny bag or hessian cloth or water misting or apply Sika Antisol® curing compound.
- Cure for minimum 3–5 days. DO NOT pond with water before 5 days of curing.
- During adverse weather conditions (high temperatures, low relative humidity, wind, sun etc.) take particular care with curing treatment.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened or cured material can only be removed mechanically.