MC-Bauchemie Emceflex 30
MC-Bauchemie’s acrylic polymer admixture that turns ordinary site-mixed cement-sand mortar into a waterproofing, bonding and repair system – supplied and applied by Space Arc across Delhi NCR and Pan-India.
What is it?
A milky-white, water-based acrylic copolymer admixture that is gauged into cement-sand mixes, or diluted with water, to waterproof, bond, repair and dust-proof concrete and masonry.
Where is it used?
Sunken slabs of toilets, terraces and roofs, basements, spalled RCC members, tile-fixing beds, cement plasters and renders, exterior cement paints, and dusty cementitious industrial floors.
Why use it?
One drum replaces several single-purpose products – it lifts the water-tightness, bond strength and abrasion resistance of ordinary site-batched mortar, without chlorides, and it will not break down under UV.
How is it applied?
Gauged by weight into cement-sand mortar per the dosage table (5-20% of cement weight depending on use), or diluted with water in fixed ratios and brush-applied as a primer, bonding coat, surface sealer or dust-proofing treatment.
About MC-Bauchemie Emceflex 30
Emceflex 30 is MC-Bauchemie’s multipurpose acrylic-polymer-based admixture for the Indian construction market – a milky-white liquid acrylic copolymer emulsion meant to be blended into cement-sand mortars rather than used on its own. Contractors reach for it to make a repair mortar that bonds tenaciously to old concrete, to make an ordinary plaster or screed noticeably less porous, or to prime and seal a substrate before tiling or painting. Per MC-Bauchemie’s own data sheet, admixed mortars show higher abrasion resistance and better imperviousness to water than plain cement-sand mixes, and the polymer film resists alkali, moisture, fungus, algae, moss and UV breakdown – useful on Indian terraces that see both monsoon soaking and peak summer sun in the same year.
Space Arc customers most often meet Emceflex 30 as the bonding-and-gauging liquid inside a repair-mortar patch on a spalled beam, column or cantilever, or as the liquid component of MC-Bauchemie’s Dichtament DS-Flex flexible waterproofing system, combined with the DS-Flex powder at 50-60% by weight. It’s equally familiar to bathroom-and-kitchen contractors doing sunken-slab waterproofing and re-screeding before tiling, since the same drum serves as primer, bonding coat and tiling-mortar additive. Being toxin- and chloride-free, MC-Bauchemie also positions it for potable water tank waterproofing and repair – a use case Space Arc frequently sees on OHT and sump rehabilitation jobs across Delhi NCR.
The technical insight
Chemically, Emceflex 30 is an acrylic copolymer latex – polymer particles suspended in water that coalesce into a continuous, flexible film as the mortar cures and water evaporates. This film partially fills the capillary pores that would otherwise wick water through the mortar, and forms a tenacious, slightly elastic bond layer between old and new concrete – which is why the same product doubles as bonding agent and waterproofing additive. Unlike some competing acrylic or SBR admixtures, MC-Bauchemie’s current India TDS quotes only density and dosage, not a specific IS/BS/ASTM conformance figure or bond-strength value for the admixed mortar, so specifiers needing code-referenced numbers for a tender should request MC-Bauchemie’s latest certification.
Where it is used
- Waterproofing admixture for basements, sunken slabs of toilets, terraces and roofs
- Bond coat and repair-mortar admixture for spalled concrete, floors, cantilevers, domes and sunken WC slabs
- Bonding additive between new and old concrete before re-screeding or patching
- Additive for cement/sand plasters, renders and floor screeds
- Admixture for cement-based exterior coatings, paints and stuccos
- Bonding additive and gauging liquid for conventional tile-fixing mortar
- Liquid component of the Dichtament DS-Flex flexible waterproofing system
- Diluted, brush-applied dust-proofing treatment for cementitious industrial floors
Key advantages
- Chloride-free, so it will not accelerate rebar corrosion in RCC repair work
- Non-toxic – listed as suitable for potable water tank waterproofing and repair
- UV-stable polymer film – exposed terraces and roof screeds do not chalk or degrade under sun
- Resistant to fungus, algae, moss and general microbial growth, useful in damp or shaded areas
- Improves abrasion resistance and water-tightness of ordinary site-batched mortar
- One product covers waterproofing, bonding, repair, screeding, tiling and dust-proofing – fewer SKUs to stock
- Simple pbw dilution ratios that site masons can follow without special equipment
- Wide working-temperature band (5-40°C) suits most Indian site conditions year-round
Limitations & considerations
- An admixture, not a membrane – waterproofing performance still depends on correct mortar mix design, thickness and curing
- India TDS does not cite an IS/BS/ASTM conformance figure or strength value, unlike some competitor admixtures
- Short pot life – admixed mortar sets in roughly 30 minutes to 3 hours, so batching matters on larger patches
- Repair mortar must go on wet-on-wet while the bond coat is tacky, demanding a disciplined two-step sequence
- Water-based, so packs need frost protection in storage and transit – relevant for hill-station projects
- Nine-month shelf life is shorter than many inorganic admixtures, so stock rotation matters
Selection & best practice
Trial-mix on site before a full pour: prepare a sound, contamination-free substrate, brush the bond coat forcefully into the pores, then place repair mortar wet-on-wet while the bond coat is still tacky – never let it dry first. Do not over-dilute Emceflex 30 beyond MC-Bauchemie’s stated ratios, the most common site error that weakens bond strength. Protect fresh admixed mortar from rapid drying so the polymer film coalesces properly, and stay within the 5-40°C application window. Shake and stir containers well before use, and clean tools with water while the material is still wet.
Specifications
| Type/Chemistry | Acrylic copolymer based liquid admixture |
| Form | Liquid |
| Colour | Milky white |
| Density | 1.01 ± 0.02 g/L |
| Consumption (repair mortar) | 10-20% by weight of cement |
| Consumption (plasters/mortars) | 5-10% by weight of cement |
| Setting time (admixed mortar) | Approx. 30 minutes to 3 hours (temperature/humidity/porosity dependent) |
| Application temperature range | 5°C to 40°C |
| Shelf life / Pack sizes | 9 months from manufacture; 30 kg pails and 230 kg drums |
Industry use cases
Residential/society sunken-slab waterproofing
Bond coat plus admixed repair mortar used to waterproof and re-screed sunken bathroom/kitchen slabs before tiling in Delhi NCR societies.
RCC spalling and corrosion repair
Chloride-free admixed patch-repair mortar for spalled beams, columns, cantilevers and slab soffits with exposed reinforcement.
Potable water tank waterproofing
Non-toxic, chloride-free admixture used in mortar linings and patch repairs of overhead and underground drinking-water tanks and sumps.
Tile-fixing over renovated substrates
Diluted as primer and blended into cement-sand bedding mortar when retiling over existing renovation substrates.
Industrial and warehouse flooring
Diluted two-coat brush application used to dust-proof ageing cementitious factory floor slabs.
Frequently asked questions
Is Emceflex 30 a waterproofing membrane on its own?
Can it be used inside a drinking-water (potable) tank?
What dosage should I use for a repair patch?
How soon after the bond coat can I place the repair mortar?
What is the shelf life and storage requirement?
Does it carry an IS/BS certification I can quote in a tender?
How we position MC-Bauchemie Emceflex 30
Within the MC-Bauchemie range, Emceflex 30 sits alongside the Dichtament DS-Flex flexible waterproofing system, where it is the liquid component gauged with DS-Flex powder – specifiers needing a fully coated, crack-bridging membrane rather than an admixed mortar should ask Space Arc about the complete DS-Flex system instead. Contractors preferring a factory-proportioned, single-pack repair mortar over site-batching may look to MC-Bauchemie’s Emcekrete range as the natural upgrade path. Outside the brand, the closest genuine equivalent is Fosroc’s Nitobond SBR, a styrene-butadiene-rubber latex performing the same dual role of bonding agent and mortar admixture; specifiers needing BS 6319-tested strength data for a tender, or already standardised on Fosroc, may reasonably choose Nitobond SBR, while Emceflex 30’s acrylic chemistry and UV/microbial resistance suit exposed terraces, roofs and potable-water work.
Fosroc Nitobond SBR — Specifiers who need BS 6319-tested bond/tensile/flexural strength data for a tender, or who are already standardised on Fosroc across a project, may reasonably choose Nitobond SBR’s SBR-latex chemistry over Emceflex 30’s acrylic system.
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