MC-Bauchemie MC-DUR 1264
A solvent-free, low-viscosity epoxy resin that pressure-injects into dry structural cracks and bonds them back into a single, load-bearing section — not just seals them shut.
What is it?
A two-component, solvent-free, low-viscosity epoxy resin (MC-Bauchemie’s Duromer injection chemistry) that bonds structural cracks in concrete back into a monolithic, load-bearing mass rather than just sealing them at the surface.
Where is it used?
Dormant, structural cracks wider than 0.2 mm in RCC columns, beams, slabs and shear walls, plus brickwork and masonry — always in dry, enclosed environments such as basements, parking structures, industrial floors and building frames.
Why use it?
It restores load transfer across a crack instead of merely capping it — strong adhesion to concrete and steel, fast early strength gain, and a viscosity thin enough to draw into hairline cracks by capillary action, which is exactly what structural (as opposed to cosmetic) crack repair calls for.
How is it applied?
Base and hardener are mixed to a low-viscosity liquid, then introduced by simple brush/capillary treatment for hairline cracks or by pressure injection through bonded adhesion packers (up to 60 bar) or drilled bore packers (up to 500 bar) using single- or two-component injection pumps such as MC-Bauchemie’s own MC-I 500.
About MC-Bauchemie MC-DUR 1264
MC-DUR 1264 is MC-Bauchemie’s two-component epoxy injection resin for structural crack repair — the product a structural engineer specifies when a crack in an RCC column, beam or slab needs to be bonded back into a single, load-bearing section rather than just filled from the surface. It’s an unfilled, unpigmented, Duromer-based epoxy: once resin and hardener are mixed, the roughly 280 cps liquid is thin enough to travel into hairline cracks by capillary action, yet rigid enough once cured to transfer compressive and shear load across the crack face much as sound concrete would.
In practice this is a dry-crack, structural-bond product, not a general-purpose sealant. Space Arc specifies and applies it on dormant cracks wider than 0.2 mm — flagged in post-monsoon inspections, pre-handover snag lists, or ahead of a structural strengthening or jacketing scheme — using bonded adhesion packers or drilled bore packers with a pressure-injection pump such as MC-Bauchemie’s own MC-I 500. Where a crack is damp, actively leaking or still moving, MC-DUR 1264 is the wrong tool; that calls for a flexible polyurethane injection resin, and we’d rather say so than force-fit an epoxy where it won’t perform.
The technical insight
The number worth understanding on this data sheet is viscosity, not just strength. At roughly 280 cps for the mixed resin, MC-DUR 1264 is thin enough to draw into cracks by capillary action before pressure injection even begins — which is what lets it reach hairline widths that a filled, thixotropic repair mortar simply can’t enter. Being unfilled and unpigmented also matters on site: there are no aggregate particles to block a fine injection port, and the clear-brown cured resin lets an inspector visually confirm the crack has actually filled, not just that pressure held on the gauge. Strength development is fast — the manufacturer’s data sheet rates it at ≥35 N/mm² compressive strength inside 24 hours, climbing to ≥55 N/mm² at 7 days and ≥60 N/mm² by 14 days (all at 30°C) — but that number only means anything if the crack was dry, sound and properly prepared before injection; epoxy doesn’t bond to laitance, dust or residual moisture, which is why MC-Bauchemie’s own application notes insist on blowing bore holes and packer surfaces dry with compressed air before injecting.
Where it is used
- Pressure injection of dormant, structural cracks (>0.2 mm) in RCC columns, beams, slabs and shear walls
- Structural crack repair in brickwork and masonry walls
- Crack injection ahead of jacketing or structural-strengthening works, to restore monolithic section behaviour before load is reapplied
- Structural bonding of cracks in dry basements and podium slabs, ahead of waterproofing or coating works
- Crack injection in industrial floor slabs prior to resurfacing or recoating, to stop reflective cracking
- Bonding hairline shrinkage and thermal cracks in parking structures and building frames
- Pre-repair crack stabilisation ahead of applying protective coatings or flooring systems on the same surface
- Retrofit strengthening of heritage or masonry structures where a dry, load-bearing crack repair is required
Key advantages
- Low mixed viscosity (~280 cps) draws into hairline cracks by capillary action, not just gravity or pressure
- Restores structural continuity — bonds crack faces into a monolithic section instead of merely sealing the surface
- Solvent-free formulation, so it can be used safely in enclosed, poorly ventilated spaces like basements and shafts
- Strong adhesion to both concrete and steel, useful where a crack runs close to or through embedded reinforcement
- Fast early strength gain (≥35 N/mm² compressive strength within just 1 day) lets follow-on trades resume sooner
- Works with methods from simple brush application to sophisticated pressure-injection equipment, so one product covers hairline and wider cracks
- Unfilled and unpigmented, so it doesn’t clog fine injection ports and cures to a clear brown that’s easy to visually verify
- Backed by MC-Bauchemie’s documented application procedure and Space Arc’s own site-injection experience across Delhi NCR
Limitations & considerations
- Dry, dormant cracks only — not designed for damp, wet or actively leaking cracks; a flexible polyurethane injection resin is the correct choice there
- Rigid epoxy bond, so it isn’t suitable for cracks under ongoing movement unless packers are specially fixed and the crack face sealed, as MC-Bauchemie’s own notes specify
- Minimum application temperature of +10°C means cold winter mornings in North India need a temperature check before injecting
- Short pot life (≥30 minutes for a 100 g mass at 30°C) shortens further in Delhi’s summer heat, so batch size and injection speed need planning
- Requires trained applicators and proper pressure-injection equipment for anything beyond hairline cracks — not a product for unsupervised or unskilled labour
- 9-month shelf life is shorter than most cementitious repair products, so stockists need to watch batch rotation
Selection & best practice
Confirm the crack is genuinely dormant and dry before ordering material — MC-DUR 1264 is not a fix for active leaks or live movement joints. Clean out laitance and loose material mechanically, then blow the crack and any drilled bore holes dry with clean compressed air; residual dust or moisture will starve the epoxy bond before it forms. Fix adhesion packers along the crack at spacing suited to its width and depth, and seal the crack face between packers before injecting, working from the lowest packer upward so displaced air escapes ahead of the resin front. Mix only as much as can be injected within the pot life — it runs shorter in Delhi’s summer heat than the lab-rated ≥30 minutes suggests — and clean all equipment immediately after use with MC-Thinner EP or MC-Clean EP; water and water-based cleaners will not work on this resin and can damage pump seals if used.
Specifications
| Chemistry / base | Two-component, solvent-free epoxy resin (Duromer injection system) |
| Colour | Clear brown liquid |
| Density at 30°C | 1.13 ± 0.03 kg/l |
| Mixed viscosity at 30°C | ~280 cps |
| Pot life (100 g mass) | ≥30 minutes at 30°C |
| Compressive strength (at 30°C) | ≥35 N/mm² (1 day), ≥55 N/mm² (7 days), ≥60 N/mm² (14 days) |
| Full cure time | 24 hours |
| Minimum application temperature | +10°C |
| Pack size / shelf life | 5 kg kit (4 kg resin + 1 kg hardener); 9 months in sealed pack, stored 5–25°C |
Industry use cases
Residential & commercial RCC framed buildings
Structural crack injection in columns, beams and slabs found during post-monsoon inspections or pre-handover snag rectification
Industrial & warehouse flooring
Crack injection ahead of resurfacing or recoating to stop cracks reflecting through the new floor topping
Basements & podium structures
Dry, dormant crack repair carried out before waterproofing or protective coating is applied over the same surface
Infrastructure & bridge rehabilitation
Structural crack injection in piers, deck soffits and abutments as part of a wider strengthening scheme
Heritage & masonry retrofit
Bonding structural cracks in brick and masonry walls during retrofitting or strengthening of older structures
Frequently asked questions
Can MC-DUR 1264 be used on wet or actively leaking cracks?
What’s the minimum crack width it can be injected into?
How is it actually applied on site?
How soon can the repaired structure be loaded again?
What pack size does it come in, and how much do I need?
Is there a comparable alternative from another brand?
How we position MC-Bauchemie MC-DUR 1264
MC-DUR 1264 belongs to MC-Bauchemie’s structural crack-injection range and is typically specified alongside the MC-I 500 single-component injection pump named in MC-Bauchemie’s own application notes, with MC-Clean EP and MC-Thinner EP as the only approved cleaning and thinning agents — never water or water-based cleaners. It is strictly a dry, dormant-crack epoxy: where a crack is damp, actively leaking or still under movement, the correct same-brand alternative is one of MC-Bauchemie’s flexible polyurethane injection resins, not a rigid epoxy like this one. Outside the MC-Bauchemie range, Fosroc’s Nitofill EPLV is a genuinely comparable solvent-free, low-viscosity epoxy crack-injection resin, and a reasonable second brand to evaluate where a project’s material list already standardises on Fosroc, or where a consultant wants a competing quote for the same scope of work.
Fosroc Nitofill EPLV — A specifier already standardised on Fosroc systems, or wanting a second quoted brand for the same scope, might choose Nitofill EPLV — a genuinely comparable solvent-free, low-viscosity epoxy crack-injection resin.
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