About MC-Bauchemie MC-Injekt 2200

MC-Injekt 2200 belongs to MC-Bauchemie’s family of acrylate (acrylic gel) injection resins, a class of materials engineers reach for when a leak is too fine or too wet for conventional epoxy or polyurethane systems. In the drum it behaves almost like water, with an initial viscosity of roughly 2 to 10 mPa.s. That is the whole point: a resin this thin wicks into cracks from about 0.05 mm upward, saturates porous concrete, and migrates through the capillary network of damp masonry that a thicker resin would simply bridge over and leave leaking. Once it contacts moisture, or once its co-reactant is blended in, the acrylic monomer polymerises into a continuous gel that fills the void it just travelled through.

The cured product is not a hard plug but a flexible-to-semi-rigid, rubbery gel that stays permanently water-impermeable in a moist environment. Because the gel is elastic, it tolerates the small, seasonal movement that hairline cracks and construction joints undergo without cracking open again, which is why acrylic gels are the go-to for curtain (area) injection behind walls and for building a horizontal damp-proof barrier in old masonry. The reaction time is fully tunable from around 5 minutes to 4 hours by adjusting the co-reactant dose, so the applicator can hold the resin thin long enough to travel deep into a large void, or snap it off quickly to chase an active, running leak. For Delhi NCR and Pan-India projects, Space Arc Engineering supplies MC-Injekt 2200 as an authorised MC-Bauchemie distributor and applicator.

The technical insight

The behaviour that makes an acrylic gel resin like MC-Injekt 2200 work is that its viscosity and its cure are decoupled. Ordinary crack-repair resins are viscous the instant you mix them, so penetration and set are locked together; a thick resin never reaches a 0.05 mm crack, and a thin epoxy still cannot be dialled in for gel time. MC-Injekt 2200 stays at water-like viscosity right up to the moment of gelation, so it does all of its travelling as a mobile liquid and only becomes a solid once it has occupied the full crack or capillary network. Gelation itself is a chemical clock, not a drying process: the acrylic monomer cross-links when it meets moisture or the metered co-reactant, and the amount of co-reactant sets how fast that clock runs, from a few minutes to several hours. Because it reacts with water rather than being defeated by it, the resin performs in exactly the wet, weeping conditions where solvent or moisture-cure systems struggle, and the resulting elastic hydrogel swells slightly and stays saturated in service, so it self-seals against the water it is meant to hold back rather than shrinking away from it.

Where it is used

• Sealing fine and hairline cracks in concrete from about 0.05 mm width upward
• Curtain (area) injection behind basement, retaining and tunnel walls to form an external water barrier
• Injecting porous or honeycombed concrete zones to make them water-impermeable
• Sealing construction joints and movement joints in water-retaining structures
• Forming a horizontal damp-proof barrier (DPC) to stop rising damp in old brick and stone masonry
• Pre-injection of expansion joints and injection through installed injection hoses/tubes
• Soil consolidation and groundwater cut-off around foundations and shafts
• Re-sealing leaking basements, lift pits, water tanks, STP/ETP tanks and below-grade slabs

Key advantages

• Water-like initial viscosity (approx. 2-10 mPa.s) penetrates cracks and pores that epoxy and PU cannot enter
• Gel time adjustable from roughly 5 minutes to 4 hours via co-reactant dosing, giving full control over travel distance versus set speed
• Cures by reacting with moisture, so it works in wet, actively damp and weeping conditions
• Flexible, elastic cured gel accommodates minor crack and joint movement without re-cracking
• Ideal for curtain injection and horizontal DPC barriers that rigid resins cannot form
• Permanently water-impermeable in moist media and chemically stable, including in alkaline concrete environments
• Tools and lines can be flushed with water while the resin is still within its working time
• Suited to low application temperatures, extending the usable season on site

Limitations & considerations

• It is a flexible waterproofing gel, not a structural resin — it seals and stops water but does not restore load-bearing crack strength the way an epoxy does
• Requires two-line injection equipment with an inline mixing head; it is not a caulk-and-go product
• Gel time is temperature and dosing sensitive, so trial injection and careful co-reactant metering are needed to avoid gelling too early or too late
• Reacted or cured gel can only be removed mechanically — lines must be flushed within the working time
• Application should stop as component and substrate temperatures approach the low single digits (around 1 degC)
• Performance depends on correct packer placement and a proper injection concept; poor detailing leaves untreated leak paths

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Injekt 2200

MC-Injekt 2200 is the fine-crack and curtain-injection specialist in an acrylic-gel toolkit. Within the MC-Bauchemie family, step up to MC-Injekt GL-95 / GL-95 TX where you need a certified acrylate gel with potable-water approvals and stronger swelling for area sealing and DPC work; move to MC-Bauchemie’s polyurethane injection resins (the MC-Injekt 2600 and 2700 HV type products) when a leak is high-flow and needs a fast-foaming resin to physically choke it, or to MC-Baudur epoxy resins when the job is structurally re-bonding a dormant crack rather than waterproofing it. Across our other brands, pair it on a repair with Fosroc Nitofill LV where the same crack must be structurally re-bonded with rigid epoxy after the water is stopped. On negative-side leak jobs it also sits alongside crystalline and cementitious systems such as Dr. Fixit and Fosroc Renderoc / Brushbond for surface reinstatement once injection is complete.

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