MC-Bauchemie MC-Injekt 1264 compact
A low-viscosity epoxy resin engineered to penetrate hairline cracks that ordinary injection resins bridge over, then cure into a structural bond stronger than the surrounding concrete.
What is it?
A two-component (4:1 by volume), solvent-free epoxy injection resin — a low-viscosity thermoset system built for force-locking, structural crack repair in concrete and masonry.
Where is it used?
RCC columns, beams, slabs, basements, retaining walls, water-retaining structures, underground shafts, manholes, culverts, and industrial floors or parking structures across new-build and rehabilitation sites.
Why use it?
Its reduced surface tension gives markedly better hairline-crack penetration than a standard low-viscosity resin, it tolerates damp or wet cracks, it cures under vibration, and it’s CE-marked to EN 1504-5 for genuine structural crack injection rather than cosmetic filling.
How is it applied?
Packers are set along the crack, Components A and B are machine-mixed 4:1 by volume for one minute, and the resin is pumped in with a 1-component pump (MC-I 520) or the MC-Fastpack 2K tool at pressures matched to packer type — up to 60 bar with adhesive packers, up to 200 bar with bore packers.
About MC-Bauchemie MC-Injekt 1264 compact
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The technical insight
The number worth reading closely on this datasheet isn’t the compressive strength — most structural epoxies clear 50-60 N/mm² — it’s the 310 mPa·s viscosity paired with 24.04 mN/m surface tension. Viscosity tells you how a resin moves through a pump hose; surface tension tells you whether it actually wets and penetrates a genuinely hairline crack once it gets there. MC-Bauchemie’s own side-by-side spreading test put a comparable-viscosity resin without the surface-tension additive package at 38.97 mN/m, wetting roughly half the area. The ~2,600 N/mm² E-modulus and ~55°C glass transition temperature matter more than they first look, too: a modulus in that range sits close enough to cracked concrete’s own stiffness that the cured resin genuinely transfers load rather than acting as a soft gap-filler, and a 55°C Tg keeps it rigid through Indian ambient and sun-exposed service temperatures instead of softening in peak summer.
Where it is used
- Force-locking (structural) injection filling of cracks, joints, and confined voids in RCC and masonry — building, civil, and infrastructure work, under both dry and damp site conditions
- Load-bearing crack repair on columns, beams, and slabs where the objective is restoring original tensile/compressive capacity, not just stopping water ingress
- Stability-critical injection work carried out to EN 1504-5 and comparable structural-repair protocols
- Strengthening and sealing underground infrastructure built in concrete and masonry — manholes, sewer shafts, and similar below-grade structures
- Grouting pre-installed injection hose systems at construction and movement joints
- Basement and retaining-wall crack injection where dampness rules out resins that demand a fully dry substrate
- Crack injection in dynamically loaded elements — bridge decks, industrial floors, rail-adjacent structures — that keep seeing vibration after repair
- Pre-treatment of hairline-cracked RCC surfaces before a waterproofing membrane or flooring system goes over them
Key advantages
- Roughly double the wetted crack area of a comparable-viscosity resin, thanks to its low 24.04 mN/m surface tension — genuine hairline-crack penetration, not just surface bridging
- Injectable into damp or wet cracks, which widens the usable window on below-grade and monsoon-affected sites where a bone-dry substrate is rarely achievable
- Cures reliably even under dynamic or vibrational loading, useful on structures that can’t be taken fully out of service during repair
- High compressive (~60 N/mm²) and tensile (~45.7 N/mm²) strength with a ~2,600 N/mm² E-modulus — built for real load transfer across the bonded crack, not cosmetic filling
- CE-marked to EN 1504-5, class U(F1) W(2) (1/2) (8/35) (1), for structural crack injection rather than a decorative or waterproofing-only fill
- Liquid-tight and chemically resistant once cured, so it closes off the crack as a water and contaminant path as well as re-bonding it
- Works with either a 1-component pump (MC-I 520) or the 2K MC-Fastpack Power-Tool, giving site teams equipment flexibility
- 24-month shelf life in unopened packaging stored between 10-30°C, useful for contractors stocking ahead of a project
Limitations & considerations
- Application must stop below 8°C substrate/component temperature — a real constraint on winter mornings at high-altitude sites, though rarely an issue across the Indian plains
- Pot life is only about 25 minutes on a small batch under lab conditions and shortens further in peak Indian summer heat, so mixing has to happen in small, disciplined batches
- It is a rigid structural resin, not a flexible sealant — the wrong choice for active, still-moving cracks or joints that need to accommodate ongoing movement
- Correct packer selection, spacing, and injection pressure genuinely decide whether the resin reaches the crack tip — this is a trained-applicator product, not a DIY fix
- Cured resin is transparent rather than pigmented, so it won’t double as a visible cosmetic crack-filler on exposed finishes
- Tool cleaning needs MC-Verdünnung EP or MC-Cleaner eco — water will not clean epoxy residue, and any material that has already reacted can only be removed mechanically
Selection & best practice
Treat this as a planned structural repair, not a quick patch. MC-Bauchemie’s own datasheet calls for a condition survey and a written injection concept before a single packer goes in — crack width, depth, and whether the crack is still active all decide packer type and spacing. Set packers first, then machine-mix Components A and B at the fixed 4:1 volume ratio with a slow-turning stirrer for a full minute; decant the mixed resin into a clean container or the pump reservoir and give it a short re-mix before injecting. Keep batches small given the roughly 25-minute pot life, and cool the components on hot Delhi or Mumbai afternoons to buy extra working time. Use MC-Adhesive Packer HP for pressures up to 60 bar or MC-Bore Packer DS 14 for up to 200 bar, and stop work altogether if substrate temperature drops below 8°C. Clean every tool with MC-Verdünnung EP or MC-Cleaner eco — never water — and budget for the fact that any resin that has started to react in the line can only be removed mechanically.
Specifications
| Chemistry | Two-component, low-viscosity epoxy resin (thermoset / Duromerharz) |
| Mixing ratio (A:B) | 4 : 1 by volume |
| Density (mixed) | ≈1.08 kg/dm³ — Comp. A ≈1.12 kg/dm³, Comp. B ≈0.95 kg/dm³ (DIN EN ISO 2811-1) |
| Viscosity | ≈310 mPa·s (DIN EN ISO 3219) |
| Pot life | ≈25 minutes per 100 g batch at 21°C ±2°C, 50% RH |
| Compressive strength | ≈60 N/mm² (DIN EN ISO 604) |
| Tensile strength / elongation at break | ≈45.7 N/mm² / ≈6.1% (DIN 53455) |
| Application temperature | 8°C to 35°C substrate/component temperature |
| Standard / pack sizes | CE per EN 1504-5: U(F1) W(2) (1/2) (8/35) (1); carton of 6×1 l set pairs, or 10 l Comp. A + 2.5 l Comp. B canisters |
Industry use cases
Basements & retaining walls
Injecting settlement and shrinkage cracks in below-grade RCC walls to restore structural continuity and cut off a water-ingress path, even where the crack face is damp.
Underground infrastructure
Repairing and strengthening concrete/masonry manholes, sewer shafts, and culvert structures where groundwater exposure rules out resins that need a dry substrate.
RCC frame repair
Re-bonding cracked columns, beams, and slabs after settlement or shrinkage cracking, restoring load-transfer across the section rather than only sealing the surface.
Industrial floors & parking structures
Structural injection of hairline cracking ahead of a flooring overlay or waterproofing membrane, so the substrate crack doesn’t telegraph through the new finish.
Water-retaining structures
Grouting pre-installed injection hoses at construction joints in tanks and similar structures during new-build or retrofit work.
Frequently asked questions
Can MC-Injekt 1264 compact be injected into a damp or actively seeping crack?
Is this the right product for a crack that’s still moving?
What equipment does the applicator need on site?
How much crack length or area does one set cover?
How long is the pot life once the two components are mixed?
Does this replace a waterproofing coating on my structure?
How we position MC-Bauchemie MC-Injekt 1264 compact
Within MC-Bauchemie’s own injection range, MC-Injekt 1264 compact sits at the rigid, structural end of the line. Pair it conceptually against the flexible polyurethane resins — MC-Injekt 2300 flow and MC-Injekt PowerSeal — which are meant for active, moving joints rather than dormant cracks; against MC-Injekt 2133 for stopping running water fast before structural injection begins; and against the acrylate gel MC-Injekt GL 95 TX where the job is sealing fine voids rather than re-bonding a load-bearing crack. For contractors comparing brands, Fosroc’s Nitofill EPLV occupies similar ground as a low-viscosity, solvent-free epoxy for the same dormant-crack repair scope, and is a reasonable alternative where a specification already names Fosroc or a hotter site programme favours its shorter, more predictable pot life. MC-Injekt 1264 compact’s differentiator is the documented surface-tension advantage — roughly double the wetted crack area of a comparable-viscosity resin — that pushes it deeper into genuinely hairline cracking.
Fosroc Nitofill EPLV — A specifier already standardised on Fosroc, or one working a hot site where a shorter, more predictable 30-60 minute pot life is preferred over MC-Injekt 1264 compact’s roughly 25-minute window, might choose Nitofill EPLV instead — both are low-viscosity epoxies built for the same dormant-crack repair job.
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