MC-Bauchemie MC-Fastpack 2700
A two-component polyurethane injection resin that stops active water ingress and re-bonds cracked concrete, masonry and rock in one cartridge-fed shot.
What is it?
A low-viscosity, two-component polyurethane duromer injection resin in ready-metered twin-chamber cartridges. It reacts fast, displaces standing water, and cures hard into a resin that both blocks the leak and re-bonds the surrounding concrete or masonry.
Where is it used?
Cracked, void-filled concrete, masonry and natural stone in buildings, basements, tunnels and hydraulic structures; pipe couplings, manhole ring joints, sheet-pile and diaphragm-wall seams — any rigid joint actively weeping water that needs both a stop and a structural gap-fill.
Why use it?
It does two jobs in one shot — stops the water and restores some load path across the crack — using a cartridge system a two-man crew can run without bulk-mixing drums or batching pumps.
How is it applied?
Set injection packers along the crack or joint, load the twin-chamber 400 ml cartridge into the pneumatic MC-Fastpack Power-Tool, and inject through the built-in MC-Quadro static mixer at a metered 1:1 ratio — components A and B mix only at the point of injection.
About MC-Bauchemie MC-Fastpack 2700
MC-Fastpack 2700 is MC-Bauchemie’s cartridge-based answer to a problem every site engineer in Delhi NCR knows well: a crack or joint that’s actively weeping water and needs fixing now, not after four weeks of drying and epoxy prep. It’s a low-viscosity, two-component polyurethane duromer resin — components A and B sit in a twin-chamber cartridge and meet only inside the static mixer at the point of injection. On contact with water it foams in a controlled way, displaces the flow, and cures hard within minutes into a resin with real compressive and tensile strength, not a soft, springy foam.
That distinction matters for how you specify it. Most PU water-stop resins on Indian sites are chosen to stay flexible, tolerating some ongoing crack movement. MC-Fastpack 2700 sits a notch further into structural territory — built to seal and reinforce, so it suits rigid joints, void-filled masonry, sheet-pile seams and rock-consolidation work where the injected material needs to carry some load again, not just plug a hole. The trade-off: it’s not the right choice for a crack that keeps moving with thermal cycles; that’s still epoxy or flexible-PU territory.
The technical insight
The number worth flagging is working time: roughly 30 seconds (ASTM D7/487) once components A and B combine. That’s deliberately short — it lets the resin start reacting inside a wet, live crack before it washes away, and it’s why the cartridge-and-power-tool delivery exists instead of hand-mixed pots. Mixed resin runs about 1.13 kg/dm³ density and 200±50 mPa·s viscosity (EN ISO 3219), low enough to penetrate fine fissures, then cures to roughly 68 N/mm² compressive and 60 MPa tensile strength (EN ISO 604/527-1) with a glass transition point above 60°C — well clear of anything an Indian substrate sees in service.
Where it is used
- Injection sealing of actively leaking cracks in basement and retaining walls below the water table
- Sealing and reinforcing cracked or void-rich concrete, masonry and natural stone in civil and hydraulic works
- Sheet-pile and diaphragm-wall joint sealing at groundwater level
- Manhole ring-joint, socket-joint and pipe-coupling waterproofing in sewer and stormwater networks
- Rigid construction-joint sealing in buildings with minimal expected movement
- Leak arrest in metro stations, service tunnels and underground utility structures
- Joint and crack sealing in dam galleries and water-retaining hydraulic structures
- Void-filling and water-cut-off injection in fissured rock ahead of a waterproofing overlay
Key advantages
- Dual-purpose — arrests water flow and restores some load-carrying continuity, not just a plug
- Reacts fast enough to work against live water pressure; no need to dry the substrate first
- Pre-metered 1:1 cartridge removes batching errors and drum wastage of bulk two-pack resins
- Cures genuinely hard — approx. 68 N/mm² compressive, approx. 60 MPa tensile — not a soft foam
- Controlled, limited foaming on contact with water gives a more predictable fill
- Compact Power-Tool kit works in confined basements, manholes and shafts where a bulk pump won’t fit
- B2 fire classification (DIN 4102) in the cured medium, useful inside occupied structures
- REACH exposure assessment and an EPD are available, useful on institutional and green-rated tenders
Limitations & considerations
- Cures rigid — not for a crack under ongoing thermal or structural movement; use flexible PU or epoxy there
- Substrate and cartridge must be above 5°C; needs site conditioning on cold North Indian mornings
- Roughly 30-second working time leaves little room for error — plan packer layout before starting, don’t improvise
- Cartridge dosing is efficient for spot injection but costlier per litre than bulk-drum systems on huge volumes
- Cleanup needs MC-Verdünnung PU, not water — plan tool and site housekeeping in advance
- Cured resin is brown and hard — a structural/waterproofing fix, so exposed surfaces still need a finish coat
Selection & best practice
Treat packer layout as the real engineering step — map the crack, set injection packers (MC-Hammerpacker LP 12 or MC-Surfacepacker LP), and run a trial shot before committing the full cartridge. Keep substrate and element temperature between 5°C and 40°C; cool the cartridge to slow the reaction on a hot site, warm it slightly on a cold one. Wrap the mixer-to-packer joint with PTFE tape if there’s dimensional play, and clean tools with MC-Verdünnung PU within the working time — cured resin only comes out mechanically.
Specifications
| Chemical base | Two-component polyurethane (PU) duromer resin |
| Mixing ratio | 1:1 by volume (Component A : Component B) |
| Density (mixed) | approx. 1.13 kg/dm³ (EN ISO 2811-1) |
| Viscosity (mixed, dynamic) | approx. 200 ± 50 mPa·s (EN ISO 3219) |
| Compressive strength | approx. 68 N/mm² (EN ISO 604) |
| Tensile strength | approx. 60 MPa (EN ISO 527-1) |
| Free expansion factor | 200-1,000% (EN 14406, dry-wet, pressure-dependent) |
| Application/substrate temperature | 5°C to 40°C |
| Pack size | 400 ml twin-chamber cartridge, 8 per carton, with MC-Quadro static mixer (1:1/2:1) |
Industry use cases
Basement & podium waterproofing
Sealing active seepage through construction joints and cracks in below-grade basement walls and podium slabs across Delhi NCR
Metro & underground infrastructure
Arresting water ingress through segment joints and cracks in metro station boxes and service tunnels
Water & sewage utility networks
Sealing manhole ring joints, socket joints and pipe couplings in municipal sewer and stormwater networks
Dams & hydraulic structures
Injection sealing of joints and cracks in dam galleries and water-retaining hydraulic works
Heritage & masonry structures
Consolidating void-rich or fissured masonry and stone walls before a waterproofing or conservation overlay
Frequently asked questions
Does the crack need to be dry before injecting MC-Fastpack 2700?
How is this different from a flexible hydrophilic PU foam?
What equipment do I need on site besides the cartridges?
How soon is the injected joint watertight?
Will it hold up through a Delhi summer and winter?
Can it replace an epoxy injection for a structural crack?
How we position MC-Bauchemie MC-Fastpack 2700
Within MC-Bauchemie’s Fastpack range, 2700 is the rigid, structural-leaning option — pair it with the more flexible MC-Fastpack PU solid or MC-Fastpack 1264 compact when a joint needs to keep moving, or step up to MC-Fastpack PR solid for full rock/void consolidation. For bulk-drum jobs where cartridge economics don’t work, MC-Injekt 2700 is the same chemistry sold for pump-fed application. Where a project is standardised on Fosroc, Nitofill PU25 LV is a genuine two-component PU alternative — it cures flexible rather than rigid, so a specifier would pick it when the crack keeps moving and a small strength trade-off is fine.
Fosroc Nitofill PU25 LV — Where a project is already standardised on Fosroc, Nitofill PU25 LV is a genuine two-component PU alternative for active-leak crack injection — it cures to a flexible, movement-tolerant solid rather than 2700’s harder duromer set, so a specifier would pick it when the crack is expected to keep moving and a small strength trade-off is acceptable.
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