About Master Builders Solutions MasterEmaco SBR 3

MasterEmaco SBR 3 is Master Builders Solutions’ styrene-butadiene rubber (SBR) latex – a milky-white polymer liquid made by high-pressure emulsion polymerisation of styrene and butadiene. On site it does two jobs at once: as a bonding agent it creates a gripping interface between hardened concrete and a fresh mortar or screed, and as a gauging liquid it replaces part of the mix water so the cement matrix ends up denser, more flexible and far less permeable. It sits in the well-known MasterEmaco concrete-repair family, the range that grew out of BASF Emaco and is now part of the MBCC Group.

For Indian sites, that versatility is the whole point. One drum handles new-to-old bond coats, polymer-modified patch repairs, waterproof slurries for tanks and sunken slabs, and hard-wearing floor screeds – so contractors carry fewer SKUs and consultants can specify a single, TUV-audited latex across a project. Because it passes IS 6582 non-toxicity, it is cleared for use inside potable water tanks, which makes it a common choice for overhead and underground reservoirs where a general-purpose bonding aid would not be acceptable.

The technical insight

The performance comes from film formation. When the latex is gauged into cement, millions of sub-micron rubber particles stay dispersed through the wet mix; as the mortar loses water and cures, those particles coalesce into a continuous, flexible polymer film that laces through the cement paste and lines its capillary pores. That film does three useful things: it blocks the fine water paths that normally let moisture and chloride ions travel through mortar, it lets you work at a lower water-cement ratio without losing workability (so you get strength without bleed), and it adds tensile give that absorbs shrinkage and thermal movement instead of cracking. At the bond line, the same film keys the new layer mechanically and chemically to the old substrate, which is why a slurry coat of SBR-and-cement grips far better than plain cement grout.

Where it is used

• New-to-old bond coats between hardened concrete, plaster and stone or brick masonry before overlaying fresh mortar or screed.
• Polymer-modified repair mortars for spalled concrete, damaged beams, chajjas, floors and precast slabs.
• Two-coat waterproof cementitious slurries for basement rafts and side walls, lift and inspection pits, and sunken bathroom and toilet portions.
• Waterproof plaster and renders on external walls, terraces, balconies and parapets.
• Abrasion-resistant, non-dusting floor screeds and toppings on industrial and commercial floors.
• Internal slurry lining of overhead and underground potable water tanks and sumps.
• Bedding and fixing tiles, and fixing or re-fixing slip bricks and stone cladding.
• Priming and re-profiling exposed roof slabs before a finished screed.

Key advantages

• One product covers bonding, repair, waterproofing and flooring – cutting inventory and simplifying specification.
• Sharply improves adhesion of fresh mortar to existing concrete, plaster and masonry.
• Reduces permeability and water penetration, boosting the durability of tanks, basements and wet areas.
• Higher flexural and tensile strength controls shrinkage and micro-cracking in mortars and screeds.
• Allows a lower water-cement ratio with no bleeding, giving denser, stronger repairs.
• Improves abrasion resistance and delivers non-dusting, hard-wearing floor finishes.
• Helps protect embedded reinforcement by cutting the moisture and chloride ingress that drives corrosion.
• Passes IS 6582 non-toxicity, so it is safe for potable-water storage structures.

Limitations & considerations

• It is a modifier and bonding aid, not a repair mortar in itself – you still need sound cement, well-graded sand and a proper site mix design.
• SBR latices can soften or re-emulsify under continuous immersion or aggressive exposure, so for permanently submerged or high-movement waterproofing a dedicated membrane is often the better call.
• Results depend heavily on surface preparation and curing; a poorly saturated substrate or rapid drying will undo the bond.
• Bond and slurry coats have a working window – once the coat skins over you must overlay in time or apply a fresh modified slurry.
• Render and screed thickness is limited (roughly 5-25 mm on walls, up to 40 mm on floors); thicker sections slump or must be built up in layers.
• Shelf life is 12 months and the drum must be kept out of direct sun and away from freezing or extreme heat.

Selection & best practice

Specifications

Industry use cases

How we position Master Builders Solutions MasterEmaco SBR 3

Within the Master Builders Solutions range, SBR 3 pairs naturally with the MasterEmaco repair mortars for larger structural reinstatement, with MasterKure curing compounds to protect finished screeds, and with MasterFlow and MasterRoc grouts for anchoring and base-plate work; where a job needs a true waterproofing membrane rather than a modified slurry, point clients to the MasterSeal coatings and membranes. MasterEmaco SBR 2 is the companion latex grade for standard bonding duties. From the other brands we distribute, direct equivalents include Fosroc Nitobond SBR, Sika Latex / SikaLatex Power and Dr. Fixit Pidicrete URP – useful when a specification names a particular brand or the approved-vendor list is fixed. We stock across these families so we can match whatever the drawings and consultants call for, rather than pushing a single line.

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