MC-Bauchemie MC-DUR 1264 LP-IN
A low-viscosity, moisture-tolerant epoxy resin that wicks into fine structural cracks by capillary action and locks them shut for good.
What is it?
A two-component, unfilled, unpigmented low-viscosity epoxy resin from MC-Bauchemie’s India-formulated MC-DUR range, purpose-built to inject and structurally re-bond cracks in concrete, masonry and brickwork.
Where is it used?
RCC columns, beams, slabs and shear walls; basements and retaining walls; water tanks and STP structures before waterproofing; parking decks and industrial floors; bridge piers and heritage brick masonry — anywhere a structural crack wider than 0.2 mm needs to be re-bonded rather than surface-patched.
Why use it?
Its roughly 250 cps mixed viscosity lets it travel deep into hairline cracks purely by capillary action, its moisture-insensitive chemistry keeps bonding on the slightly damp concrete typical of Indian sites and monsoon-season work, and its 65 N/mm²-plus compressive strength restores a cracked section to near-monolithic behaviour.
How is it applied?
Resin and hardener are batched 4:1 by weight, mixed with a slow-speed paddle, and introduced through surface-bonded adhesion packers (up to 60 bar) or drilled bore packers (up to 500 bar) using single- or two-component pumps such as MC-I 500, injecting from the lowest packer upward until refusal.
About MC-Bauchemie MC-DUR 1264 LP-IN
MC-DUR 1264 LP-IN is MC-Bauchemie’s India-market, low-viscosity member of the MC-DUR epoxy injection family — a two-component, unfilled and unpigmented resin built for one job: getting deep inside a structural crack and re-bonding it into a monolithic section again. It is not a surface patching compound or a cosmetic filler. Supplied as a resin and a hardener that are combined in a simple 4:1 ratio by weight, it mixes to a clear, pale-yellow liquid with a viscosity close to light machine oil (~250 cps at 30°C), which is precisely what lets it wick into cracks as fine as 0.2 mm under nothing more than capillary pull, or be pumped under pressure through packers into wider or deeper sections.
For Space Arc’s applicator teams working across Delhi NCR and pan-India sites, the two properties that matter most day to day are its moisture-insensitive chemistry and its workable pot life. Indian sites are rarely bone-dry — basements, water tanks, monsoon-affected RCC, older masonry — and a resin that still bonds reliably on damp substrates removes one of the most common causes of injection-repair failure. At the same time, a pot life of roughly 50 minutes for a small test mass at 30°C gives crews a realistic working window in typical site heat, provided batch sizes are kept sensible. We specify it as the default epoxy crack-injection resin for structural repair work where the crack is dormant and non-leaking, reserving polyurethane chemistries for actively running water.
The technical insight
The formulation choice here is deliberate: MC-DUR 1264 LP-IN is left unfilled and unpigmented, trading the bulking economy of a filled grout for the thinnest possible mixed viscosity (~250 cps at 30°C, close to that of light machine oil). That is what lets it travel through a 0.2 mm crack under nothing more than capillary pull, and it is why the sheet keeps the resin clear and pale-yellow — installers can visually verify full penetration rather than guess at it. The trade-off is that it is not a gap-filler; it is a bonding agent for genuine crack repair, not a substitute for a thixotropic patching mortar on spalled or honeycombed concrete. The “moisture insensitive” claim is the second pillar of the chemistry, and it matters more in India than the TDS lets on: most crack-injection failures on Indian sites trace back to residual dampness in the substrate defeating a moisture-sensitive resin’s cure, so a formulation engineered to tolerate damp-to-dry conditions (rather than requiring bone-dry concrete) removes a common site variable. Strength data is reported against ASTM C579 (compressive) and ASTM D638 (tensile) rather than an IS method, which is standard practice for imported epoxy chemistries sold in India — specifiers writing to IS 3921 or similar should note the ASTM basis when cross-referencing project specs. Pot life of ≥50 minutes for a 100 g mass at 30°C is a small-batch figure; larger mixed volumes exotherm faster and the working window shrinks accordingly, which is the main site-discipline point applicators need to internalise.
Where it is used
- Pressure injection of structural cracks (>0.2 mm) in RCC columns, beams, slabs and shear walls using adhesion packers
- Bore-packer injection (up to 500 bar) for deeper or through-section cracks in mass concrete, retaining walls and bridge piers
- Crack re-bonding in basements, water tanks and STP structures under damp-to-dry (non-actively-leaking) conditions ahead of waterproofing works
- Structural crack repair in load-bearing brickwork and masonry, including heritage and older RCC buildings
- Restoring monolithic load transfer in cracked parking decks and industrial floor slabs before resurfacing
- Pre-treatment injection of cracked columns or beams prior to FRP wrapping or jacketing in strengthening projects
- Gravity or brush-fed capillary sealing of hairline surface cracks where pressure equipment is not warranted
- Precast element and tunnel-lining crack repair where a clear, inspectable low-viscosity resin is specified
Key advantages
- Very low mixed viscosity (~250 cps) drives deep capillary penetration into hairline cracks without pressure equipment
- Moisture-insensitive chemistry bonds reliably on the damp concrete common on Indian sites and in monsoon-season work
- Compressive strength ≥65 N/mm² (7-day, ASTM C579) restores near-monolithic strength to the cracked section
- Good adhesion to concrete, steel and masonry gives one resin versatility across RCC and brick structures
- Clear, unpigmented, pale-yellow resin lets applicators visually verify complete crack fill rather than guess
- Workable pot life (≥50 minutes for a 100 g mass at 30°C) suits typical Indian site working temperatures
- Simple 4:1 resin-to-hardener ratio by weight reduces on-site batching errors versus multi-part systems
- Compatible across the application spectrum, from simple brush/gravity feed to single- and two-component pressure injection machines
Limitations & considerations
- Minimum application temperature is above +10°C, so it is unsuitable for cold-store structures or very early winter-morning pours in North India
- Being unfilled and low-viscosity, it is a bonding resin, not a gap-filler — wide cracks, voids or spalled concrete need a filled epoxy or repair mortar instead
- Pot life shortens quickly in peak Indian summer site temperatures, so batch sizes and application pace need real discipline above roughly 35°C ambient
- Formulated for damp-to-dry conditions, not actively running water — live leaks call for a hydro-insensitive polyurethane injection resin, not this product
- Correct packer spacing, pressure control and refusal-point judgement require a trained applicator; it is not a DIY crack-filler
- Full hardness needs 24 hours, so load reinstatement and follow-on trades must be sequenced around that cure window
Selection & best practice
Treat surface prep as half the job: grind or wire-brush laitance and loose material off the crack face, blow out all dust with dry compressed air (never water), and only then fix adhesion packers at roughly 150–300 mm centres, sealing the crack face between them with a fast-set epoxy or polyester mortar. On dynamically loaded members, anchor the packers mechanically rather than relying on the surface seal alone. Mix strictly 0.8:0.2 (resin:hardener) by weight with a slow-speed paddle, decant into a clean container and re-stir briefly before charging the pump — never mix a batch larger than can be injected within the pot-life window at the day’s ambient temperature. Inject from the lowest packer upward, holding pressure until resin appears at the next packer or the crack visibly refuses further uptake, then cap and move to the next. Clean guns and lines with MC-Thinner EP immediately after use or during any extended pause — water and water-based cleaners will ruin the equipment, not the resin. Hold the structure at or above +10°C through the full 24-hour cure and log packer spacing, batch sizes and injection pressures for the QA file, since crack injection is one of the harder repair items to verify after the fact.
Specifications
| Chemistry / System | Two-component, low-viscosity epoxy resin (unfilled, unpigmented) |
| Density at 30°C | 1.100 ± 0.03 kg/litre |
| Mixing ratio (Resin : Hardener) | 0.8 : 0.2 by weight (4:1) |
| Viscosity, mixed, at 30°C | ~250 cps |
| Pot life (100 g mass, 30°C) | ≥ 50 minutes |
| Compressive strength (7-day, 30°C) | ≥ 65 N/mm² as per ASTM C579 |
| Tensile strength (7-day, 30°C) | > 20 N/mm² as per ASTM D638 |
| Full hard-dry | 24 hours |
| Application temperature / pack sizes | >+10°C to <+40°C; 1 kg kit (0.8 kg resin + 0.2 kg hardener) and 10 kg kit (8 kg resin + 2 kg hardener); shelf life 12 months |
Industry use cases
Residential & Commercial RCC
Structural crack injection in cracked columns, beams and slabs of Delhi NCR apartment and office buildings, re-bonding the section before finishing works resume.
Water & Wastewater Structures
Damp-condition crack sealing in STP tanks, sumps and water-retaining structures ahead of applying a dedicated waterproofing coating system.
Parking Structures & Industrial Floors
Restoring monolithic continuity across shrinkage and structural cracks in parking decks and factory floor slabs before resurfacing or re-coating.
Bridges & Infrastructure
Bore-packer pressure injection into cracked bridge piers, abutments and box girders as part of periodic structural rehabilitation.
Heritage & Load-Bearing Masonry
Crack re-bonding in older load-bearing brick and masonry structures where the resin’s adhesion to masonry and visual inspectability matter.
Frequently asked questions
What crack width does MC-DUR 1264 LP-IN work best on?
Can it be used on damp concrete, or does the crack need to be bone-dry?
How is MC-DUR 1264 LP-IN different from the standard MC-DUR 1264 LP?
What equipment do I need to apply it?
What pack sizes are available in India?
How soon can the repaired member be loaded after injection?
How we position MC-Bauchemie MC-DUR 1264 LP-IN
Within MC-Bauchemie’s own range, MC-DUR 1264 LP-IN sits alongside filled, thixotropic MC-DUR grades for wider cracks or vertical gap-filling, and it pairs naturally with MC-Bauchemie’s polyurethane injection resins for actively leaking or hydro-dynamic cracks the epoxy chemistry isn’t meant for, plus the MC-I 500 injection pump line referenced directly on its own data sheet. On the equipment side, Space Arc typically specifies it together with MC-Bauchemie’s adhesion and bore packers and MC-Thinner EP for cleaning, so the whole injection system comes from one accountable supplier. Against the wider market, the closest genuine equivalent is Fosroc’s Nitofill LV, a similarly low-viscosity, two-part epoxy crack-injection resin; a specifier already standardised on Fosroc’s repair range, or matching an existing project spec, would reasonably choose that option instead, while MC-DUR 1264 LP-IN remains our first recommendation where moisture tolerance on damp Indian substrates and MC-Bauchemie’s local technical support are the deciding factors.
Fosroc Nitofill LV — A specifier already standardised on Fosroc’s repair range, or matching an existing project specification, might reasonably choose Nitofill LV instead, since both are genuinely comparable low-viscosity epoxy crack-injection resins.
Related Concrete Repair products
Source MC-Bauchemie MC-DUR 1264 LP-IN for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.