Product Overview

MC-Injekt 2K is a two-component, hydrophilic, water-reactive polyurethane injection resin from MC-Bauchemie for emergency waterproofing injection of actively leaking cracks, construction joints, and void spaces in concrete structures. The reaction mechanism of MC-Injekt 2K is fundamentally different from the single-component MC-Inject 1K: when the two components (isocyanate Component A and polyol Component B) are mixed in the injection pump proportioning head (at the specified ratio) and injected into a crack or joint that contains water or wet surfaces, the isocyanate groups in the mixed resin react with the water to generate carbon dioxide gas and polyurea linkages — the CO2 causes the resin to foam and expand (expanding to 2 to 10 times its liquid volume depending on the water quantity present), while the polyurea reaction simultaneously crosslinks the foam structure to form a semi-rigid to flexible, water-impermeable closed-cell foam that fills the crack, expands against the crack faces to seal the leakage path, and accommodates future crack movement with the elastomeric flexibility of the cured PU foam. The two-component formulation of MC-Injekt 2K provides controllable reaction kinetics: the mixing ratio of Component A (isocyanate) to Component B (polyol) can be adjusted at the proportioning pump to control the reactivity (faster or slower foam expansion) depending on the leak severity and the injection rate required — higher isocyanate ratios produce faster, more expansive foaming for high-flow active leaks; the mixing ratio is set at the dual-component injection pump before injection begins. The critical operational decision in crack injection is the selection between MC-Inject 1K (single-component moisture-triggered PU — for slow seepage and damp cracks) and MC-Injekt 2K (two-component water-reactive foaming PU — for active flowing water leaks where the injection resin must react immediately and expand aggressively to stop the flow). Space Arc Engineering supplies MC-Injekt 2K for waterproofing injection contractors, structural repair specialists, and infrastructure maintenance agencies in Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh, particularly for monsoon-season emergency basement and tunnel waterproofing interventions.

Applications

• Active water stop injection in basement retaining walls — emergency injection of actively flowing water through construction joints, tie-bolt holes, and shrinkage cracks in reinforced concrete basement retaining walls during and after monsoon season in Delhi NCR — the MC-Injekt 2K foam expands rapidly on contact with the flowing water in the crack, sealing the leak path within minutes of injection — for a typical basement construction joint leak with water flowing at 0.5 to 2 litres per minute, MC-Injekt 2K injected at 1 to 3 bar through a packer drilled into the wall stops the flow completely within 3 to 5 minutes
• Metro and underground rail tunnel water stop injection — emergency injection of water-inflow cracks and defective segment joints in metro tunnels, underground station boxes, and underpasses in Delhi Metro Phase 4, Noida Metro, and Meerut Metro infrastructure — the aggressively water-reactive MC-Injekt 2K foam is the injection system specified for wet tunnel defect repair where the seepage rate precludes use of slower-reacting single-component systems
• Swimming pool and water tank leakage repair — injection of leaking cracks and construction joints in concrete swimming pools, water storage tanks, and open channel lining where the pool or tank cannot be drained completely for repair and the injection must be performed with the structure still in service — MC-Injekt 2K reaction with the residual moisture in the crack allows injection into damp concrete and wet cracks without draining the structure
• Underground car park expansion joint leakage — injection of failed or deteriorated expansion joint sealant locations in underground car park structures where water infiltration from the ground above (typically through the podium deck waterproofing or from groundwater during monsoon) is flowing through the expansion joint into the car park below — injection of the joint with MC-Injekt 2K foam from the negative side (car park interior) provides temporary or long-term waterproofing relief pending full external joint re-sealing
• Pipe annular gap waterproofing in underground structures — injection of the annular gap between service pipes (water, sewer, electrical conduit) penetrating through basement walls, raft slabs, and tunnel linings — a common source of water ingress in basement and underground structures where the annular gap is not adequately waterproofed during construction — the expanding MC-Injekt 2K foam fills and seals the annular void completely regardless of the gap geometry

Key Advantages

• Rapid water stop — reacts with flowing water within seconds of contact — the two-component water-reactive formulation begins foaming immediately on contact with the water present in the actively leaking crack, expanding and filling the crack cavity to stop water flow typically within 1 to 5 minutes of injection — the fastest response of any chemical injection system for active leak stopping in concrete structures
• Expansive foam penetrates irregular crack geometry — the foam expansion (2 to 10 times liquid volume) drives the reacting material into crack branches, voids, and irregular cavity geometry that a rigid injection resin cannot penetrate under gravity alone — the expansion pressure ensures complete filling of the crack volume including areas beyond the direct injection point
• Flexible, elastic cured foam — the cured MC-Injekt 2K foam is an elastic, flexible closed-cell polyurethane material that accommodates continued crack movement (thermal cycling, minor settlement) after injection — unlike rigid epoxy injection or cementitious grout, the flexible PU foam will not re-crack when the crack moves cyclically over the structure service life
• Adjustable reactivity at the injection pump — the mixing ratio of Component A to Component B can be adjusted at the dual-component proportioning pump to vary the reaction speed (gel time) from 30 seconds to 5 minutes — faster reaction for high-flow leaks, slower reaction for low-flow cracks where penetration depth before foaming is more important than speed — providing the injection specialist with control over the reaction to optimise the injection for each specific leak scenario
• Long-term waterproofing performance — the cured polyurethane foam is stable against the alkaline concrete environment, groundwater, and the range of water temperatures encountered in basement and underground structure service — providing long-term waterproofing performance at the injected location rather than a temporary stop-gap that will fail within one monsoon season