Product Overview

MC-Injekt FS addresses the specific emergency situation of active, high-flow water ingress in below-grade concrete structures — the most urgent and technically challenging waterproofing problem in Indian construction where basements, underground car parks, metro tunnels, and water supply structures are experiencing visible water jets or continuous water flow through concrete cracks and construction joints, requiring immediate stoppage of the water before any further repair or waterproofing work is possible. The key distinction between MC-Injekt FS (foaming, high-expansion, fast-reacting) and the standard MC-Injekt 1K (also moisture-reacting PU but semi-rigid foam) is the reaction speed and expansion volume: MC-Injekt FS is specifically formulated to react within 5 to 30 seconds of contact with water (versus 30 to 120 seconds for MC-Injekt 1K) and to expand 10 to 25 times its liquid volume (versus 3 to 5 times for MC-Injekt 1K) — providing the fast, high-volume foam generation needed to physically fill and block a large, actively flowing water channel against the flow pressure before the foam is washed out or diluted by the flowing water. The physical mechanism of water stop with MC-Injekt FS involves the injection of the liquid resin (low viscosity, 200 to 400 mPa.s) through a drilled packer hole at the crack or joint under 2 to 8 bar injection pressure — the resin flows into the water-bearing crack or void, contacts the flowing water, and reacts within seconds to form a rapidly expanding rigid foam that physically blocks the water flow channel; the foam expansion against the crack walls and the injection packer seals the crack and stops the flow; the injection pressure and the foam expansion pressure combine to ensure the foam penetrates the full depth of the crack or void rather than just forming a surface plug. The practical application of MC-Injekt FS in Indian construction is primarily in the emergency waterproofing of flooded basements and underground structures during the monsoon season (July to September) in Delhi NCR and across India, where inadequate waterproofing and construction joint defects allow monsoon groundwater to enter below-grade spaces at flow rates of 0.5 to 5 litres per minute per leak point. Space Arc Engineering supplies MC-Injekt FS for emergency basement waterproofing, underground structure leak stopping, and tunnel injection repair works in Ghaziabad, Noida, Delhi, and Uttar Pradesh.

Applications

• Emergency stop-leak injection in actively flooding basements and underground car parks during the monsoon — immediate stoppage of active water ingress through concrete cracks, construction joints, tie rod holes, and column-to-slab interface leaks in basement retaining walls and raft slabs of multi-storey residential and commercial buildings in Delhi NCR, Noida, and Ghaziabad during the July to September monsoon season when groundwater levels rise by 1 to 3 metres and the hydrostatic pressure on basement walls increases from 0.1 to 0.5 bar at the start of monsoon to 0.3 to 1.5 bar at peak monsoon groundwater; the high-expansion foam of MC-Injekt FS physically stops the active water flow within 20 to 60 seconds of injection, creating the stable, dry condition needed for subsequent permanent repair by MC-Injekt 2K PU structural resin injection or by cementitious waterproofing treatment; without this emergency stop-leak step, no subsequent repair can be applied to an actively flowing crack because the flowing water dilutes, displaces, or washes out any repair material before it can cure
• Active water ingress stop in metro tunnels, railway tunnels, and underground utility structures — injection of actively leaking construction joints, segment-to-segment joints, and ground-water-ingress points in bored metro tunnels (Delhi Metro and Rapid Rail Transit System running tunnels and station structures), cut-and-cover underground structures, and underground utility tunnels (electrical cable tunnels, water supply tunnels) in Delhi NCR and Uttar Pradesh where tunnel segment joints or cast-in-situ concrete construction joints allow groundwater infiltration; the high-flow-rate fast foam of MC-Injekt FS is the technically appropriate product for high-head groundwater injection in tunnels at depths of 5 to 25 metres below ground where the water pressure can reach 0.5 to 2.5 bar — at these pressures, slow-reacting or low-expansion resins are washed out by the water pressure before they can gel; MC-Injekt FS high reactivity (5 to 30 second gel time) and high foam pressure (generated by the 10 to 25 times expansion) counteract the driving water pressure and achieve a positive foam plug
• Water stop injection in construction joint leaks in underground water supply and sewage structures — stopping active water leaks at construction joint defects in underground concrete water supply reservoirs, clear water sumps, overhead service reservoir foundations, and sewage treatment plant concrete structures across Delhi NCR and Uttar Pradesh where water is either leaking out (costly treated water loss from reservoirs) or leaking in (groundwater contaminating drinking water storage); MC-Injekt FS is compatible with potable water applications after full curing (verify current certification) and provides the fast foam stop needed to work on active wet surfaces in water retaining structures where all conventional repair materials require dry surfaces

Key Advantages

• 5 to 30 second gel time — fastest available reaction speed for stopping high-flow-rate active water ingress against injection pressure — the gel time (the time from first water contact to initial foam gel formation that resists flow) of MC-Injekt FS at 5 to 30 seconds is the critical performance parameter that distinguishes it from standard moisture-curing PU injection resins; at a crack or joint with flowing water at 2 bar pressure and 1 to 2 litres per minute flow rate, a resin with 60 to 120 second gel time will be washed through and out of the crack before it gels and cannot stop the leak; MC-Injekt FS with 5 to 30 second gel time initiates foam formation within the crack immediately on contact with the flowing water, blocking the flow channel before the expanding foam can be washed out; the gel time can be shortened to 3 to 15 seconds by adding MC-Injekt Accelerator at 1 to 5 percent of the resin volume (by syringe injection into the packer immediately before the resin) for very high pressure active leaks
• 10 to 25 times expansion ratio for filling large voids and crack cavities with minimum resin volume — the 10 to 25 times volumetric expansion of MC-Injekt FS means that 100 ml of liquid resin injected into a 2,000 ml void produces 1,000 to 2,500 ml of foam, filling the void completely without requiring continuous pumping of large resin volumes; this high expansion ratio makes MC-Injekt FS highly cost-effective for stopping large voids and cavities (construction joint voids, large honeycombs, annular gaps around service penetrations) where a low-expansion or rigid injection resin would require proportionally large volumes of material to fill the void; the foam exerts an outward expansion pressure against the void walls as it expands, improving the contact and seal between the foam and the concrete substrate