MC-Injekt 1K
Single-Component Moisture-Triggered Polyurethane Crack Injection Resin — Flexible Foam Seal for Water-Bearing Cracks and Joints in Concrete Basements, Tunnels, and Below-Grade Structures
Authorized Project Distributor — MC-Bauchemie India | Space Arc Engineering, Ghaziabad
Product Overview
MC-Injekt 1K is a single-component polyurethane injection resin from MC-Bauchemie representing the most straightforward and commonly used crack injection product for the remediation of water-bearing cracks in below-grade concrete structures in India. The fundamental mechanism distinguishes MC-Injekt 1K from the two-component alternatives in the MC-Bauchemie injection range: MC-Injekt 1K contains a water-reactive isocyanate prepolymer that does not require a separate hardener component — when the resin contacts the moisture in a water-bearing crack (or ambient humidity above approximately 60 percent), the isocyanate reacts with water molecules to liberate carbon dioxide gas and simultaneously cross-link the polymer chains, producing an expanding, closed-cell polyurethane foam that fills the crack cavity and seals it. This single-component mechanism has two important practical advantages for Indian construction sites: simpler equipment (a single-component injection pump versus the two-component metering-and-mixing pump required for MC-Injekt 2K) and ability to work with actively leaking cracks where the water flow assists in distributing the resin through the crack network. The expansion of MC-Injekt 1K (typically 2 to 5 times the liquid volume) also means a relatively small quantity of liquid resin can fill a large crack void when the crack is moist. The resulting foam is flexible and compressible, capable of accommodating post-injection crack movement of 1 to 3 mm, making it appropriate for cracks with residual thermal or structural movement. In contrast to the rigid epoxy injection (MC-Injekt EP) which requires a dry crack and delivers structural bond restoration, MC-Injekt 1K works in moist-to-wet conditions and delivers a waterproof flexible seal, not structural restoration. Space Arc Engineering supplies MC-Injekt 1K for waterproofing contractors, civil maintenance firms, and structural repair specialists in Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh.
Applications
- Active water leak sealing in concrete basement walls and slabs — injection of MC-Injekt 1K into actively leaking cracks in reinforced concrete basement walls, basement slabs, lift pit walls, underground parking structures, and basement water tanks in Delhi NCR buildings where groundwater or rainwater infiltration through cracks is causing water entry into the occupied basement space; the moisture-reactive expansion of MC-Injekt 1K allows the resin to chase and seal the water flow path within the crack rather than being diluted and washed out by the water (which would occur with a water-miscible or moisture-sensitive injection product)
- Cold joint and construction joint sealing in below-grade concrete — remediation of leaking cold joints and construction joints in basement walls, floor-to-wall joints, wall-to-wall joints, and other planned and unplanned construction joints in below-grade concrete structures where the joint has not been effectively sealed during construction and is now leaking; MC-Injekt 1K injection creates a continuous flexible foam seal within the joint cavity, stopping water ingress and accommodating the differential movement that typically occurs at construction joints from thermal cycling and structural loads
- Tunnel lining and underground structure crack sealing — injection of MC-Injekt 1K into cracks and joint leaks in bored tunnel linings, cut-and-cover box structure walls, underground metro station walls and slabs, and underpasses in Delhi NCR metro and road tunnel infrastructure; the flexible foam seal is appropriate for tunnel lining cracks where the structure continues to experience small vibration-induced movements from adjacent traffic or train operations, and where a rigid epoxy seal would crack again under the ongoing movement
- Water retaining structure crack sealing in reservoirs and water treatment plants — injection into cracks in the walls and floors of reinforced concrete service reservoirs, underground water tanks, sump pits, and water treatment infrastructure where cracks are causing water loss and the structure must be made watertight without full draining and reconstruction; MC-Injekt 1K is suitable for injection into the water-bearing face (wet side) of the crack where the structure cannot be dewatered for injection from the dry side
- Utility tunnel and pipe duct water ingress remediation — sealing of leaking cracks and joints in precast and in-situ concrete electrical cable tunnels, pipe duct corridors, and utility tunnels in industrial facilities and infrastructure where water ingress is causing flooding of the tunnel floor and risk of electrical equipment damage; MC-Injekt 1K can be injected from within the utility tunnel without excavation, providing a rapid and economical solution to water infiltration without major civil work
Key Advantages
- Single-component — simpler equipment and no mixing ratio errors — the single-component formulation requires only a single-component hand or pneumatic injection pump (no two-component metering pump needed), making the injection process simpler to set up and operate, and eliminating the mixing ratio errors that can occur with two-component injection resins (incorrect A:B ratio causes under-cure or over-brittleness in the injected material); on Indian construction sites where operator training is variable, the single-component system provides more reliable results with less skilled injection operators
- Moisture-triggered expansion — works in actively leaking wet cracks — the moisture-reactive mechanism means MC-Injekt 1K does not require the crack to be dry before injection (unlike rigid epoxy injections that require a dry substrate for adhesion); the presence of water in the crack is a prerequisite for the reaction — the more water present, the faster and more complete the expansion; this means MC-Injekt 1K can be injected directly into actively flowing leaks, with the expansion reaction occurring immediately on contact with the flowing water
- Flexible foam seal accommodates post-injection crack movement — the closed-cell polyurethane foam has a compressive set of 20 to 50 percent, allowing the injected foam to be compressed and then re-expand as the crack width changes from thermal cycling (in Indian conditions, crack width in an unprotected basement wall can cycle by 0.5 to 1.5 mm between summer and winter from temperature-related concrete volume change) — this flexibility prevents the seal from debonding or cracking under normal crack movement after injection, which is the primary failure mode of rigid injection products in thermally active crack locations
- Controlled expansion ratio for complete void filling in wide crack cavities — the MC-Injekt 1K expansion ratio (typically 2 to 5 times liquid volume depending on moisture availability) allows complete filling of wide crack voids (1 to 20 mm width) with a relatively small volume of injected liquid — reducing the material cost of injection for wide cracks and compensating for the incomplete filling that would occur if a non-expanding resin were used at typical injection pressures in wide-cavity cracks
Technical Data
| Type | Single-component moisture-reactive polyurethane (PU) injection resin — low viscosity liquid, expands on contact with moisture |
| Viscosity (Mixed) | 100 to 300 mPas at 20 degrees Celsius (low viscosity for penetration into fine cracks under injection pressure) |
| Reaction with Water | Moisture-triggered expansion to closed-cell PU foam — reaction begins on contact with moisture |
| Expansion Ratio | 2 to 5 times the injected liquid volume depending on moisture availability in the crack |
| Flexibility of Cured Foam | Compressible, flexible closed-cell foam — elongation at break variable with density and temperature |
| Application Method | Single-component injection pump — mechanical or pneumatic — injection ports drilled at 200 to 300 mm spacing along crack |
| Injection Pressure | 2 to 6 bar depending on crack width and depth — stop when resin appears from adjacent port |
| Application Temperature | 5 to 35 degrees Celsius — reaction rate increases with temperature and moisture content |
Get a Quote
+91 9999155255 | info@space-arc.com | Space Arc Engineering, Sahibabad, Ghaziabad
Frequently Asked Questions
A civil contractor in Noida has been awarded a contract to stop water leakage in a 10-year-old reinforced concrete basement parking structure under a commercial building — the basement has multiple leaking cracks in the perimeter retaining walls (crack widths 0.2 to 3 mm, most are actively weeping water) and two leaking cold joints at wall-to-floor and mid-height wall construction joints — the contractor has used cement grouting to try to stop the leaks before but the cement grout keeps washing out or re-cracking — what is the complete MC-Injekt 1K injection procedure for the wall cracks and construction joints, how are the injection ports spaced and drilled, and why does PU injection work when cement grouting has repeatedly failed?
The failure of cement grouting on these basement leaks is predictable and your contractor has correctly identified that a different approach is needed. Here is the complete MC-Injekt 1K injection procedure and the explanation of why PU injection succeeds where cement grouting fails. Why cement grouting fails on active basement leaks: cement grout (a slurry of OPC cement and water) has three fundamental limitations for active water leak sealing that make it unsuitable for the application: (1) hydraulic washout — the cement particles (mean particle size 10 to 30 micrometres) are physically washed out of the crack by the flowing water before they can set; even in slowly weeping cracks, the water flow dilutes the grout and reduces the w/c ratio to the point where the grout has insufficient binding to develop strength; (2) shrinkage on setting — cement grout shrinks by 0.05 to 0.10 percent during hydration, creating a gap at the cement-concrete interface through which water finds a new flow path; (3) rigidity — hardened cement grout has no flexibility and cracks when the crack width changes from thermal or structural movement, re-opening the same leak path; MC-Injekt 1K addresses all three failure modes: it reacts with the water rather than being washed out by it; it expands rather than shrinks; and it produces a flexible foam rather than a rigid brittle seal. Complete injection procedure for the basement perimeter walls and construction joints: Stage 1 — crack mapping and port layout: walk the entire basement perimeter and map all leaking cracks on a sketch — note the crack width at multiple points (0.2 mm hairline, 1 mm medium, 3 mm wide), the leak flow rate (weeping, dripping, flowing), and the location of the two construction joints; for each crack, mark the injection port positions — port spacing 150 to 200 mm for cracks under 0.5 mm width, 200 to 300 mm spacing for cracks 0.5 to 3 mm width; for the construction joints, port spacing 250 to 300 mm. Stage 2 — port drilling: use a rotary hammer drill with a 12 mm diameter drill bit to drill injection ports at each marked position — drill at an angle of 30 to 45 degrees to the wall face so the drill hole intersects the crack midway through the wall thickness (for a 250 mm thick wall, drill at 45 degrees to a depth of approximately 175 mm to intersect the crack at 125 mm depth); insert injection port packers (standard 12 mm diameter plastic injection packers with pressure valve) and hand-tighten or hammer into the drilled holes. Stage 3 — crack surface sealing (caulking over the crack face): after drilling ports, seal the crack surface between the ports with quick-setting hydraulic cement (such as MC-Nafufill KS or similar rapid-hardening mortar) — apply a 3 to 5 mm thick sealing band 30 to 40 mm wide over the crack face between the ports; leave a 10 to 15 mm unsaled zone at each port; allow 10 to 15 minutes for the surface seal to achieve initial set before injection; the surface seal prevents the injected resin from simply flowing out of the crack face rather than penetrating through the wall. Stage 4 — MC-Injekt 1K injection: load the single-component injection pump cylinder with MC-Injekt 1K resin; connect the pump nozzle to the first injection port at the lowest point of the crack (injection proceeds from bottom to top for wall cracks — gravity assists downward flow of resin toward the crack); inject at 2 to 4 bar pressure — watch the adjacent port for resin breakthrough; when resin or foam appears at the adjacent port, disconnect the pump, cap the injected port, move to the next port and repeat; continue up the crack from port to port; for actively flowing cracks (water flowing at significant rate), inject at slightly higher pressure (4 to 6 bar) and inject more rapidly to outpace the water flow; the resin will foam and expand on contact with the moisture in the crack — you will see foam appearing at the crack face adjacent to the ports. Stage 5 — construction joint injection: for the wall-to-floor and mid-height construction joints, follow the same port drilling and injection procedure but use 200 to 250 mm port spacing along the joint length; the construction joints are typically wider (1 to 5 mm) and require more resin per port due to the larger void — calculate resin volume as: crack width x crack depth x port spacing x 0.5 (accounting for 50 percent void filling efficiency factor for initial injection) per port, with re-injection if necessary. Post-injection monitoring: after injection, monitor the wall and joint for 24 to 48 hours — if water reappears through a previously injected location, the foam has not fully sealed the flow path and re-injection is required; re-injection uses the same ports (which can be reused if kept clean) and injects additional resin until the leak stops permanently. Space Arc Engineering supplies MC-Injekt 1K, injection port packers, single-component injection pumps, and MC-Nafufill KS quick-set mortar for waterproofing contractors in Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh — contact +91 9999155255 for product supply and technical assistance.
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Space Arc Engineering is an Authorized Project Distributor for MC-Bauchemie India serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
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