About MC-Bauchemie Nafufill 30

Nafufill 30 is MC-Bauchemie’s acrylic polymer-based universal bonding agent, sold in India as a milky-white liquid latex dispersion with a specific gravity of 1.06. Chemically it’s a saponification-resistant acrylic co-polymer emulsion – and that resistance matters more than it sounds, because it’s what keeps the polymer film from breaking down when it stays damp or sits inside an alkaline cement matrix, which is exactly the environment every repair mortar and waterproofing slurry lives in. Where a cheaper PVA-based bonding agent can re-emulsify and lose grip the moment it meets sustained moisture, Nafufill 30 is built to survive inside a wet, curing mortar for the long haul.

On site, that translates into one liquid doing several jobs a project team runs into constantly: a bonding slurry coat between old concrete and a new topping, a gauging additive that lets patch mortars and levelling screeds be drawn thinner without slumping, and an admixture for tile-fixing beds and waterproofing slurries under sunk slabs. MC-Bauchemie’s own mixing table sets out separate ratios for bonding slurries, thin and thick patch mortars, screeds, plaster and even lime whitewash – which is the giveaway that this is a genuinely universal admixture rather than a single-use product dressed up with extra applications on the label.

The technical insight

The number worth remembering on a Nafufill 30 site visit isn’t a strength figure – the India data sheet doesn’t publish one – it’s the dosage ratio, because that’s what actually gets misapplied. MC-Bauchemie doses it by parts-by-volume against water and against cement/sand rather than as a fixed percentage of cement weight, so a patching mortar under 10 mm thick (1 cement : 2 sand, 1 Nafufill 30 : 2 water) is a noticeably richer mix than a screed above 30 mm thick (1 Nafufill 30 : 6 water). Under-dosing a thick screed to save material is the single most common way this product underperforms on site.

Where it is used

• Bonding slurry coat brushed between old, hardened concrete or masonry and a fresh mortar or concrete topping
• Patch and repair mortars for spalled steps, columns, screeds and general concrete damage
• Thin-layer levelling and smoothening renders where a plain sand-cement mix would slump or craze
• Tile-fixing mortars for wall cladding and thin-bed floor tiling over hardened substrates
• Waterproofing slurries and mortars under basement walls, sunk toilet slabs, terraces and pool decks
• Repair mortars for precast concrete units, pipeline collars and similar factory-cast damage
• High-wear dado mortars in wet areas subjected to standing water and foot traffic
• Bonding coat and admixture for hard-burnt brick, AC sheet, natural stone, lime and gypsum plaster work, and as a limewash adhesion additive

Key advantages

• Closes the old-to-new bond gap that causes most patch-repair failures on Indian sites – de-bonding, not strength loss, is usually why a repair patch pops off
• Saponification-resistant acrylic chemistry stays stable in the damp, alkaline environment inside a curing mortar, unlike basic PVA bonding agents that can re-soften
• Lets mortars and renders be drawn out to genuinely thin layers without slumping or hairline-cracking
• Adds elasticity to the cured mortar or concrete, cutting down on stress-crack formation as the patch dries and the structure moves
• Improves resistance to oil and petrol attack – relevant for workshop floors and basements doubling as parking
• One liquid covers bonding coats, repair-mortar admixing, tile-fixing gauging and even limewash adhesion, which simplifies the site store
• Chloride-free and non-toxic, so it’s safe to use in mixes going anywhere near reinforcement steel
• Dosing is simple parts-by-volume – a mason with a bucket and a mug can follow the table without batching equipment

Limitations & considerations

• It’s a bonding and performance admixture, not a repair mortar by itself – it still needs a properly proportioned cement/sand mix, or a ready-made repair mortar, to be mixed into
• The India technical data sheet we sourced doesn’t quote an IS, ASTM or EN standard or a strength figure – specifiers who need EN 1504-type documentation should ask MC-Bauchemie India for supporting test data before writing it into a spec
• Shelf life is a modest 9 months from date of manufacture, and it must stay in unopened packaging away from rain, direct sun, heat and frost – a site store with poor stock rotation can end up with dead drums
• Ratios are parts-by-volume, not weight, so accuracy on a busy site depends on consistent gauging containers and supervision – it’s easy for labour to eyeball it wrong
• Not a substitute for a dedicated waterproofing membrane under sustained hydrostatic pressure – it waterproofs and strengthens the mortar itself, it doesn’t replace tanking on a high water-table basement
• Coverage and cost per square metre swing a lot between a thin slurry coat and a thick screed dosage, so quoting off a flat per-litre rate without checking the actual application ratio will misprice the job

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie Nafufill 30

Within MC-Bauchemie’s own Nafufill range, Nafufill 30 is the everyday bonding-and-admixture liquid that sits alongside factory-batched repair mortars like Nafufill KM and levelling mortars like Nafufill LM – on larger structural repair jobs, it typically gets specified as the priming/bonding coat under one of those pre-formulated mortars rather than as part of a fully site-batched mix. Outside the MC-Bauchemie family, the closest genuine equivalent is Fosroc’s Nitobond SBR, an SBR-latex bonding agent aimed at the same repair and tile-fixing applications – a reasonable alternative where a project has already standardised on Fosroc systems.

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