Product Overview

MC-Inject 1K is a single-component, isocyanate-based hydrophilic polyurethane injection resin from MC-Bauchemie that undergoes a controlled expansion and curing reaction upon contact with water — the water in the crack or joint void both triggers the polyurethane crosslinking reaction (isocyanate-water reaction generating CO2 gas that expands the foam) and forms part of the cured polymer network, producing a flexible, water-activated, closed-cell polyurethane foam that seals the water path within the injected crack or joint. The single-component formulation of MC-Inject 1K is the fundamental distinction from the two-component MC-Injekt 2K polyurethane resin: MC-Inject 1K contains only the isocyanate-functional prepolymer in the cartridge or container — no separate catalyst or polyol component is required — the ambient moisture (water) in the crack serves as both the activator and co-reactant for the curing reaction. This simplicity makes MC-Inject 1K particularly suited to: field conditions where two-component mixing ratio control is difficult (remote construction sites, urgent repairs without specialist mixing equipment); cracks and joints with sustained water flow where the continuous moisture supply ensures complete reaction of the injected resin throughout the void; and applications where a flexible foam seal is acceptable (cracks with potential for thermal or structural movement require flexibility, whereas epoxy injection is used for structural crack repair requiring rigidity). The expansion ratio of MC-Inject 1K — the ratio of foam volume to injected liquid volume — is controlled by the water content in the void: higher water flow produces greater expansion (up to 10 to 20 times volume expansion with free water) while a damp crack with limited moisture produces lower expansion and a denser, more resilient foam. The injection technique for MC-Inject 1K uses standard low-pressure injection packers (8 or 13 mm diameter, drilled into the crack at 150 to 300 mm spacing) and a single-component injection pump (cartridge gun or piston pump) — the same equipment used for epoxy resin crack injection. Space Arc Engineering supplies MC-Inject 1K for waterproofing contractors, civil maintenance engineers, and structural repair specialists across Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh.

Applications

• Active water leak crack injection in basement walls — injecting MC-Inject 1K into cracks in basement retaining walls and raft slabs where water is actively flowing through the crack, to stop the water ingress by foam expansion and sealing within the crack void — the moisture-activated cure is ideal for active water cracks because the flowing water ensures complete cure throughout the crack depth rather than being dependent on ambient humidity as with two-component resins in dry cracks
• Construction joint void waterproofing injection — sealing the internal void space of construction joints in basement structures (raft-to-wall joints, lift joint between retaining wall sections) where water is penetrating through the joint and the void requires filling with a flexible waterproofing material that can accommodate the slight movement that occurs at construction joints during thermal cycling
• Tunnel lining crack injection for active water inflow — stopping active water inflows through cracked concrete tunnel lining sections in road and railway tunnels where the injection must be carried out against running water at the crack face — MC-Inject 1K reacts immediately on contact with the running water and foam expansion blocks the crack void within minutes of injection
• Expansion joint void sealing — injecting MC-Inject 1K into deteriorated or water-infiltrated expansion joint voids in bridges, parking structures, and industrial floors where the original joint filler or sealant has failed and water is penetrating through the joint void into the structure — the flexible foam seal accommodates the thermal opening and closing movement of the expansion joint after curing
• Pipe penetration annular gap sealing — injecting MC-Inject 1K into the annular gap around pipe penetrations through concrete basement walls and floor slabs where the original core fill or sealant has deteriorated and water is entering around the pipe — the foam expands to fill the irregular annular gap geometry and provides a flexible waterproof seal resistant to the vibration transmitted through the pipe
• Masonry wall crack and joint injection — sealing water-active cracks and deteriorated mortar joints in brick and stone masonry structures (historic buildings, boundary walls, bridge parapets) where water infiltration is occurring through open masonry joints and a single-component injection resin that reacts with the ambient moisture in the masonry is simpler and more effective than two-component mixing systems

Key Advantages

• Single-component — no mixing ratio control required — the injection resin is supplied ready to use in the injection pump without any measurement, mixing, or blending of components — eliminates the most common cause of injection resin failure (incorrect two-component mixing ratio causing partial or non-cure) and simplifies field application in urgent or remote conditions
• Moisture-activated cure — water in the crack or joint void triggers and drives the curing reaction — ensures complete cure throughout the crack depth even in deep or complex crack geometries where a two-component resin might leave uncured zones due to uneven component mixing — crack moisture is the cure catalyst rather than an obstacle to curing
• Flexible cured foam — the cured polyurethane foam is flexible and accommodates crack movement from thermal cycling, settlement, and traffic loading without cracking or debonding — essential for sealing cracks in structures subject to ongoing movement, where a rigid epoxy injection would re-crack at the original or adjacent location under further movement
• Controllable expansion ratio — the volume expansion of the foam (5 to 20 times liquid volume depending on water content) fills irregular crack and joint void geometries completely — the self-expanding foam reaches areas and pore spaces that a rigid injection grout cannot penetrate, providing a more complete void fill particularly in complex crack networks
• Compatible with standard injection equipment — uses the same single-component cartridge gun or piston pump and standard 8 to 13 mm injection packers used for epoxy crack injection — no specialist equipment purchase required — waterproofing contractors already equipped for epoxy crack injection can use MC-Inject 1K without additional investment
• Long pot life in the cartridge — single-component resin has a long shelf life in the sealed cartridge — partially used cartridges can be resealed and stored for subsequent use — unlike two-component systems where partial batches must be discarded after pot life expiry