PRODUCTS>> Cement Modifier

 
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MASTERBOND-SBR LATEX is an emulsion of single component styrene butadiene co-polymer based latex specially developed to improve the properties of cementitious compositions. MASTERBOND-SBR LATEX when used in combination with standard quality of ordinary portland cement, it enhances the mechanical properties such as bonding (adhesion) with various building materials, flexurals, compression and impact strength. MASTERBOND-SBR LATEX improves the thin section fragility of cement when used as coating. It is resistant to hydrolysis hence can be used for external applications too.


 

 

Technical Information

 Appearance
:
 Single component milky white pourable liquid
 PH value at 25° C
 Viscosity on Brookfield
:
:

8 - 10
100 CPS Max. Viscometer spinIe 1.12 R.P.M at 25°C

 Surface Tension(Dynes/cm)
 Specific Gravity

:
:
45 + 1.0
1.02 + 0.02

 Durability with water



 Mechanical Stability

:



:
Dilutable in any Proportion (as per application)der water immersion
Smooth

Good
 Compatibility
:
 Compatible with cement & concrete admixtures
 Storage Stability
 Freeze thaw Stability
 Toxicity
:
:
:
Excellent
5 cycles / min
Non - Toxic


Advantages
  • Increases flexural and tensile strength
  • Compressive strength is comparable with concrete.
  • Reduced shrinkage, water permeability.
  • Good bonding between old & new concrete.
  • High strength mortar with good resilience
  • Durable structural repairs, restoration & waterproofing Improved abrasion resistant flooring


Features

  • Simple to use as it is a single component.
  • Cures to a hard, tough & wear resistant surface.
  • Bonds (adheres) strongly to the most surface types.
  • Can be applied to an uniform thickness coating on horizontal and vertical surfaces.
  • Allows trapped water (vapours) to escape and prevents blistering and adhesion failures.
  • Makes cement mortar or coating compact which prevents salt penetration into
    the concrete.
  • It is unaffected by UV light and prevents fading of concrete.
  • It acts as anti-corrosive for steel. SBR is highly durable even in continuous contact with water.
  • It is resistant to water, dilute acids and alkali solutions.
  • It is non-flammable & non-hazardous. Does not evolve toxic gases when exposed to fire
  • Non-toxic to human being.
  • Most properties improves on ageing
  • Resistant to fungus and micro-organism growth.


Usage

• Waterproofing of building, toilets sunken portion basement.
• Waterproofing of water tanks and swimming pools.
• Repairing of concrete and masonry walls-internal, external & terrace roofs by cement mortars.
• Renovation and protection of concrete against corrosion and salt petre.
• As a bonding agent for old concrete to new concrete, industrial floor or floor duct nosing repair.


Surface Preparation
Surface preparation is the most important step before application to achieve desired results and avoid failures.
The surface should be absolutely dry, free from dust coatings, loose particles, fungus, moss, oils, greases, mould-release agents & dirt. Clean the surface by scrapping,
sand blasting to remove dirt & loose particles.
Treat surface with 5%-10% hydrochloric acid, followed by complete neutralization with water, which will improve bonding of the coating. Oils, greases & mould-release
agents can be cleaned with solvents.


Direction for use
MASTERBOND-SBR LATEX is first separately diluted with water by adding water to SBR-Latex. The diluted SBR-Latex is then added into the mixture & homogenised.

a) Method
(1) On a clean & well prepared surface apply SBR-Latex cement slurry (SBR : Cement: 1 : 1 Part by weight).
(2) Apply SBR-Latex mortar by trowel to achieve uniform & smooth finish. Application of SBR-Latex modified mortar should be very fast as it cures fast.
(3) Moist cure for 24 hours & then allow it to cure

b) Preparation of mortar
Cement 1.00 Kg
Sand 2.50 Kg
Water 0.16 Kg
MASTERBOND SBR LATEX 0.20 Kg
DEFOAMER (if required) SILICONE TYPE (Dosage as per requirement)
 

  • Deformers of silicone type (proprietary products) can be used but dosage depends upon the method of mixing & manufacturers recommendations. Adjust quality of water for workability if required. Do not add excess water.
  • Increase the proportion of MASTERBOND SBR-LATEX for more demanding situations.


Specifications
STRUCTURE REPAIR
(a) Remove all sealed / loose concrete to reach up to the concrete or reinforced structure and remove all loose dust by means of wire brush.
b) Remove all dust particles by means of high jet water.
c) Apply one coat of MASTERBOND-SBR LATEX with
cement (Ratio of MASTERBOND-SBR LATEX: cement :: 1 :1 PBW) on cleaned reinforcement & allow to dry for 2 - 3 hrs. Coverage: 60 + 5 sq.ft. / Litre / coat
d) Apply MASTERBOND-SBR LATEX coat i.e. mixture of cement: SBR (1:1 by PBW) on entire surface. Allow it to dry for 1-2 hrs. Coverage: 30 + 5 sq.ft. / lit / coat
e) Now prepare polymer modified mortar as given below and apply it on entire concrete substrate at 10mm or 20mm thickness as required.

Cement 50 Kg
Sand 125 Kg
Water 8-10 Kg.
MASTERBOND-SBR LATEX 8-10 Kg.

Apply above polymer mortar by hand pressing over tacky MASTERBOND-SBR LATEX
f) Allow to cure above polymer mortar for one day.

Curing
Moisture cure for 24 hours allow to dry out

Cleaning
Tools & equipments should be cleaned with water immediately after use.

Shelf life
24 months from the date of manufacture.
Shake well before using after prolonged storage
Packing
1 Litre, 5 Litres, 20 Litres , 200 Litres plastic container



 
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