About STP ShaliCrete 47

{“name”:”ShaliCrete 47″,”slug”:”stp-shalicrete-47″,”brand”:”STP”,”realProduct”:”yes”,”officialSource”:”http://www.stplimited.in/product/shalicrete-47/”,”category”:”waterproofing”,”metaTitle”:”ShaliCrete 47 | Acrylic Bonding & Waterproofing | Space Arc”,”metaDescription”:”STP ShaliCrete 47 is a 47% solids acrylic polymer used as a bonding agent, waterproofing coating and mortar admixture on Indian construction sites.”,”heroSubtitle”:”A 47%-solids acrylic polymer that bonds new concrete to old, waterproofs roofs and tanks, and boosts the strength of site-mixed repair mortars — one drum, three jobs.”,”glance”:{“whatIsIt”:”A milky-white, single-component polymerised acrylic emulsion with 47 ± 2% solid content, used as a bonding agent, waterproofing coat and cement mortar admixture.”,”whereUsed”:”RCC roof slabs and terraces, sunken toilet/utility slabs, water tanks and sumps, construction joints, spalled column/beam repairs, and bonding coats ahead of plaster or tiling.”,”whyUse”:”It bridges hairline weaknesses in the substrate, cuts water ingress, and lifts the compressive and flexural strength of ordinary site-batched mortar, without needing a separate SBR drum plus a separate waterproofing coat.”,”howApplied”:”Brushed on neat as a two-coat waterproofing membrane, or gauged into cement at fixed ratios — 1:1 by volume for bonding slurry, or 5 kg per 50 kg cement + 150 kg sand for repair mortar — then cured with a 24-hour water spray.”},”about”:”ShaliCrete 47 sits in STP Limited’s acrylic-coatings line under the Shali family, positioned as the higher-solids sibling of the base ShaliCrete admixture. Where many site-level SBR or acrylic bonding agents are sold as thin, diluted emulsions, ShaliCrete 47 is formulated at 47 ± 2% solid content — meaning a given quantity lays down substantially more polymer film per coat, which is what lets STP market one product for three jobs on the same slab: a waterproofing coat, a construction-joint bonding agent, and a strength-boosting gauging additive for repair mortar and cement slurry.\n\nFor Space Arc’s Delhi NCR clients — builders finishing terraces before monsoon, contractors patching spalled RCC on older group-housing blocks, or applicators prepping a slab before tile-fixing — that multi-role positioning is the real draw. A single 200 kg drum on site can cover the waterproofing coat on a terrace, the bonding slurry at a construction joint, and the repair mortar on a parapet, cutting down on how many different admixture containers a site team has to track. It is not a substitute for a dedicated torch-applied membrane or a polyurethane system on a habitually ponding roof, but as a brush-applied, chloride-free polymer modifier for concrete and mortar, it covers a large share of the small-to-mid waterproofing and repair scope that Indian sites actually need.”,”technicalInsight”:”Chemically, ShaliCrete 47 is a polymerised acrylic emulsion rather than the styrene-butadiene rubber (SBR) chemistry used in many older-generation bonding agents — STP itself sells ShaliSBR Latex as the SBR alternative in its own range. Acrylic emulsions generally hold up better under UV and alkaline (high-pH cement) exposure over time than SBR latex, which is likely why STP markets the 47%-solids grade specifically for exposed waterproofing coats rather than only as a below-tile bonding layer. The nil chloride content matters on RCC work — chloride-bearing bonding agents and accelerators are a known contributor to rebar corrosion in coastal and humid Indian conditions, so this is one less variable to manage near reinforcement. STP references BS 6319 Parts 2, 3 and 4 — British Standard test methods covering compressive, tensile-splitting and flexural strength of polymer-modified mortars — as the basis for the strength figures on its data sheet.”,”applications”:[“Waterproofing coat on RCC roof slabs, terraces and sunken toilet/utility slabs, applied in two brush coats”,”Bonding coat at construction joints and between old and new concrete pours, gauged 1:1 by volume with cement”,”Polymer-modified repair mortar for spalled or honeycombed RCC on columns, beams and parapets”,”Admixture for cement slurry toppings and bonding coats ahead of screeds”,”Bonding layer under plaster on smooth, dense or previously painted concrete surfaces”,”Internal waterproofing coat for water tanks, sumps and reservoir walls (confirm potable-water suitability with STP before use on drinking-water tanks)”,”Bonding coat ahead of tile fixing on RCC substrates in wet areas such as bathrooms and balconies”],”advantages”:[“47 ± 2% solid content means fewer coats for the same film build compared with thinner, diluted acrylic or SBR bonding agents”,”Nil chloride content — no added corrosion risk to embedded reinforcement steel”,”One product covers three jobs — waterproofing coat, bonding agent and mortar admixture — reducing the number of different admixture drums a site has to stock”,”Brush-applied with no special spray equipment, so site labour already familiar with coating work can apply it correctly”,”Strength and adhesion figures referenced to BS 6319 Parts 2, 3 & 4 rather than unsubstantiated marketing claims”,”Scales from small balcony repairs to full terraces with 5 kg, 20 kg and 200 kg pack options”,”Backed by STP’s technical team and Space Arc’s site support across Delhi NCR for dosage guidance mid-job”],”limitations”:[“Not a standalone waterproofing membrane system — it’s a coating/admixture and still needs correct detailing at drains, pipe collars, parapet junctions and expansion joints, which the product alone won’t fix”,”60-minute pot life once gauged into cement mortar, so batch sizes need to match the mason’s actual placing speed, especially in Delhi’s summer heat”,”Performance depends heavily on surface-prep discipline — the data sheet specifies concrete at least 3 days old, sound, and free of laitance, oil and release agents; skipping this is the most common cause of on-site adhesion complaints with any acrylic coating”,”STP’s published data covers compressive/flexural/bond strength and coverage rates but doesn’t carry a specific rating for negative-side (reverse) waterproofing under sustained hydrostatic head — for basements with active water pressure, a dedicated crystalline or membrane system is usually the safer call”,”Coverage of 3.0–3.5 m²/kg for the waterproofing coat assumes a reasonably smooth substrate; rough or highly porous concrete will consume noticeably more material than the data-sheet figure”],”bestPractice”:”Confirm the concrete is at least 3 days old, structurally sound, and free of laitance, dust, oil and curing-compound residue before starting — ShaliCrete 47 bonds to the substrate, it doesn’t fix a dirty one. Pre-wet or dampen the surface so it’s saturated but not glistening wet, then brush-apply in two or more coats with a 5–6 hour gap between coats so each layer skins over before the next goes on. Where it’s gauged into mortar (bonding slurry or repair mortar), mix only what the mason can place inside the roughly 60-minute pot life — in Delhi’s peak summer, that window shrinks further, so smaller batches beat one large mix. After the final coat or mortar application, cure with a light water spray for the next 24 hours; skipping this step is a common reason acrylic-coated terraces develop hairline shrinkage cracks in their first monsoon.”,”specs”:[{“property”:”Chemistry”,”value”:”Polymerised acrylic emulsion (high-solid acrylic coating)”},{“property”:”Appearance”,”value”:”Milky white liquid”},{“property”:”Solid Content”,”value”:”47 ± 2%”},{“property”:”pH”,”value”:”7.7″},{“property”:”Chloride Content”,”value”:”Nil”},{“property”:”Coverage (waterproofing coat)”,”value”:”3.0–3.5 m²/kg in 2 coats”},{“property”:”Compressive Strength (7 days, repair mortar mix)”,”value”:”10–13 N/mm²”},{“property”:”Standard Referenced”,”value”:”BS 6319 Parts 2, 3 & 4″},{“property”:”Pack Sizes”,”value”:”5 kg, 20 kg, 200 kg”}],”useCases”:[{“sector”:”Residential terrace waterproofing”,”detail”:”Builder-floor and independent-house terraces across Delhi NCR, applied as a two-coat brush-on membrane ahead of monsoon, usually combined with a protective tile or screed overlay for foot traffic”},{“sector”:”RCC repair on ageing structures”,”detail”:”Spalled concrete on columns, beams and parapets in older DDA flats and group-housing societies, using the 50 kg cement : 150 kg sand : 5 kg ShaliCrete 47 repair-mortar ratio from the data sheet”},{“sector”:”Construction-joint bonding”,”detail”:”Bonding slurry (1:1 by volume with cement) at cold joints between old and new concrete pours on extensions, additional floors and slab repairs”},{“sector”:”Water tank and sump lining”,”detail”:”Internal waterproofing coats for storage tanks and sumps in residential and small commercial buildings, subject to confirming potable-water suitability with STP where relevant”},{“sector”:”Tile-fixing prep on RCC”,”detail”:”Bonding coat on dense, smooth RCC substrates in bathrooms and balconies before tile adhesive is laid, improving key on surfaces too smooth for direct tile fixing”}],”faq”:[{“q”:”How is ShaliCrete 47 different from plain ShaliCrete or an ordinary SBR bonding agent?”,”a”:”The ’47’ refers to its solid content — at 47 ± 2% solids it’s a higher-build acrylic emulsion than STP’s standard ShaliCrete or its SBR-based ShaliSBR Latex, so a given quantity lays down more polymer film per coat, which is why STP markets it for waterproofing coats and not just bonding duty.”},{“q”:”What’s the actual dosage for a repair mortar mix?”,”a”:”Per STP’s data sheet, the repair-mortar ratio is 50 kg cement : 150 kg sand : 5 kg ShaliCrete 47. For a bonding slurry it’s 1:1 by volume with cement, and for the neat waterproofing coat it’s applied undiluted in two coats.”},{“q”:”Can it be used under tiles in a bathroom?”,”a”:”Yes — it’s commonly used as a bonding coat on dense RCC before tile fixing, but it’s a bonding/waterproofing coating, not a tile adhesive itself; you’d still need a proper tile adhesive over it, and the slab should ideally get separate waterproofing treatment at the drain and pipe penetrations.”},{“q”:”How long does one drum last, and what pack sizes are available?”,”a”:”STP packs it in 5 kg, 20 kg and 200 kg containers, so small balcony repairs and full-terrace jobs can both be sized appropriately without over-ordering; coverage works out to roughly 3.0–3.5 m²/kg for a two-coat waterproofing application.”},{“q”:”Does it contain chloride or anything that could corrode reinforcement?”,”a”:”No — STP’s data sheet lists chloride content as nil, which matters for any coating or admixture used close to embedded steel, especially through Delhi NCR’s humid monsoon months.”},{“q”:”How does buying through Space Arc compare with buying directly from an STP dealer?”,”a”:”Space Arc is an authorised STP distributor and applicator across Delhi NCR, so pricing tracks STP’s official price list with the added benefit of application guidance and site support — worth checking before comparing against unauthorised sellers, since acrylic emulsions like this are sensitive to storage conditions and the 12-month shelf life can be compromised in grey-market stock.”}],”positioning”:”Within STP’s own range, ShaliCrete 47 sits alongside the standard ShaliCrete admixture and ShaliSBR Latex as bonding/adhesion options, and next to ShaliPlast IW and ShaliPlast IW CI as integral waterproofing admixtures for specifiers who want the polymer mixed straight into the concrete rather than coated on afterward. Outside the STP range, the closest genuine equivalent Delhi NCR contractors compare it against is Fosroc’s Nitobond SBR — an SBR-based bonding and gauging additive with a similar bonding/mortar-modifier role, though built on a different (SBR vs acrylic) polymer chemistry. Space Arc, as an authorised STP distributor and applicator, can advise on which of the two suits a given substrate and exposure condition.”,”fosrocAlternative”:{“name”:”Nitobond SBR”,”slug”:”fosroc-nitobond-sbr”,”note”:”Specifiers already standardised on Fosroc’s range, or those who want a lower-cost, purely SBR-based bonding and gauging additive rather than a multi-role acrylic film coating, often specify Nitobond SBR instead.”}}

The technical insight

Chemically, ShaliCrete 47 is a polymerised acrylic emulsion rather than the styrene-butadiene rubber (SBR) chemistry used in many older-generation bonding agents — STP itself sells ShaliSBR Latex as the SBR alternative in its own range. Acrylic emulsions generally hold up better under UV and alkaline (high-pH cement) exposure over time than SBR latex, which is likely why STP markets the 47%-solids grade specifically for exposed waterproofing coats rather than only as a below-tile bonding layer. The nil chloride content matters on RCC work — chloride-bearing bonding agents and accelerators are a known contributor to rebar corrosion in coastal and humid Indian conditions, so this is one less variable to manage near reinforcement. STP references BS 6319 Parts 2, 3 and 4 — British Standard test methods covering compressive, tensile-splitting and flexural strength of polymer-modified mortars — as the basis for the strength figures on its data sheet.

Where it is used

• Waterproofing coat on RCC roof slabs, terraces and sunken toilet/utility slabs, applied in two brush coats
• Bonding coat at construction joints and between old and new concrete pours, gauged 1:1 by volume with cement
• Polymer-modified repair mortar for spalled or honeycombed RCC on columns, beams and parapets
• Admixture for cement slurry toppings and bonding coats ahead of screeds
• Bonding layer under plaster on smooth, dense or previously painted concrete surfaces
• Internal waterproofing coat for water tanks, sumps and reservoir walls (confirm potable-water suitability with STP before use on drinking-water tanks)
• Bonding coat ahead of tile fixing on RCC substrates in wet areas such as bathrooms and balconies

Key advantages

• 47 ± 2% solid content means fewer coats for the same film build compared with thinner, diluted acrylic or SBR bonding agents
• Nil chloride content — no added corrosion risk to embedded reinforcement steel
• One product covers three jobs — waterproofing coat, bonding agent and mortar admixture — reducing the number of different admixture drums a site has to stock
• Brush-applied with no special spray equipment, so site labour already familiar with coating work can apply it correctly
• Strength and adhesion figures referenced to BS 6319 Parts 2, 3 & 4 rather than unsubstantiated marketing claims
• Scales from small balcony repairs to full terraces with 5 kg, 20 kg and 200 kg pack options
• Backed by STP’s technical team and Space Arc’s site support across Delhi NCR for dosage guidance mid-job

Limitations & considerations

• Not a standalone waterproofing membrane system — it’s a coating/admixture and still needs correct detailing at drains, pipe collars, parapet junctions and expansion joints, which the product alone won’t fix
• 60-minute pot life once gauged into cement mortar, so batch sizes need to match the mason’s actual placing speed, especially in Delhi’s summer heat
• Performance depends heavily on surface-prep discipline — the data sheet specifies concrete at least 3 days old, sound, and free of laitance, oil and release agents; skipping this is the most common cause of on-site adhesion complaints with any acrylic coating
• STP’s published data covers compressive/flexural/bond strength and coverage rates but doesn’t carry a specific rating for negative-side (reverse) waterproofing under sustained hydrostatic head — for basements with active water pressure, a dedicated crystalline or membrane system is usually the safer call
• Coverage of 3.0–3.5 m²/kg for the waterproofing coat assumes a reasonably smooth substrate; rough or highly porous concrete will consume noticeably more material than the data-sheet figure

Selection & best practice

Specifications

Industry use cases

How we position STP ShaliCrete 47

Within STP’s own range, ShaliCrete 47 sits alongside the standard ShaliCrete admixture and ShaliSBR Latex as bonding/adhesion options, and next to ShaliPlast IW and ShaliPlast IW CI as integral waterproofing admixtures for specifiers who want the polymer mixed straight into the concrete rather than coated on afterward. Outside the STP range, the closest genuine equivalent Delhi NCR contractors compare it against is Fosroc’s Nitobond SBR — an SBR-based bonding and gauging additive with a similar bonding/mortar-modifier role, though built on a different (SBR vs acrylic) polymer chemistry. Space Arc, as an authorised STP distributor and applicator, can advise on which of the two suits a given substrate and exposure condition.

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