MC-Bauchemie MC-Injekt 2700 HV
MC-Bauchemie’s polyurethane injection resin for sealing and structurally bonding cracks, joints and cavities in wet or leaking concrete, masonry and natural stone.
What is it?
A polyurethane-based, water-reactive injection resin from MC-Bauchemie that fills and seals cracks, joints and cavities. In contact with water it foams in a controlled way to form a closed-cell, waterproof mass that stops seepage and consolidates the substrate.
Where is it used?
Below-ground and water-retaining structures: basement walls and rafts, tunnels and shafts, water tanks, sewage and treatment works, retaining walls, lift pits and construction joints where water is actively moving.
Why use it?
It works on damp and actively leaking cracks that epoxy cannot handle, cures waterproof with high compressive and tensile strength, and is DIBt-tested for contact with soil and groundwater, making it suitable for potable-adjacent and environmental structures.
How is it applied?
Injected under pressure through drilled packers set along the crack, using a single- or two-component PU pump. Reactivity is tuned on site with accelerator so the resin gels and foams once it reaches the wet zone.
About MC-Bauchemie MC-Injekt 2700 HV
MC-Injekt 2700 HV belongs to MC-Bauchemie’s established 2700 family of resin-based injection systems, engineered for one of the most stubborn problems on any site: water finding its way through a crack that will not stay dry long enough to patch. It is a low-viscosity, polyurethane duromer resin with water-displacing behaviour, which is exactly why it earns its place in a leak-sealing kit. When the injected resin meets the water sitting in the crack, it reacts and foams in a limited, controllable way to produce a closed-cell rigid mass that both drives the water back and locks itself into the crack walls. The result is a seal that is genuinely waterproof rather than a temporary plug.
For engineers and applicators in Delhi NCR and across India, the appeal is versatility. The same resin that stops a running leak in a basement raft can also be used to consolidate loose masonry or firm up ground behind a construction pit, because the cured product carries real compressive and tensile strength rather than staying soft. It bonds to concrete, brick and natural stone, tolerates the damp conditions that are unavoidable during monsoon and in below-ground work, and complies with building material class B2 to DIN 4102. Because reactivity can be adjusted with MC’s accelerator, a single drum of resin covers everything from slow, deep saturation of a fine crack to a fast reaction where water is gushing.
The technical insight
The mechanism hinges on isocyanate chemistry meeting free water. MC-Injekt 2700 HV is delivered as a reactive polyurethane resin; the moment it contacts water inside the crack, the isocyanate groups react, releasing carbon dioxide that expands the resin into a foam while the polymer chains cross-link into a solid. Two things happen at once. The gas generation gives a controlled expansion that pushes the resin outward against the water pressure and into the finest capillaries, so the resin seeks out the leak path rather than sitting where it was injected. Simultaneously the polymer network hardens into a closed-cell rigid foam, which is why the cured material resists water passage instead of merely absorbing it. Because the formulation is water-displacing (hydrophobic in character), it performs where the crack is wet or actively flowing, unlike epoxies that demand a dry, clean substrate. On-site control of reaction speed is the practical lever: adding accelerator shortens the gel time so the resin foams quickly against high-pressure ingress, while a slower reaction lets it travel deep into a fine, low-flow crack before it sets. This tunability is what lets one product cover both structural crack filling and emergency leak stopping.
Where it is used
- Sealing actively leaking cracks in basement walls, rafts and retaining structures
- Stopping seepage at construction joints in tunnels, shafts and underground car parks
- Waterproofing repair of water tanks, sewage works and treatment plants
- Consolidating and reinforcing cracked or loose masonry and natural stone
- Sealing and solidifying construction-pit enclosures against water ingress
- Firming up and improving load capacity of loose subsoil behind structures
- Curtain and crack injection in dams and other water-retaining structures
- Sealing infiltration at manholes, inspection chambers and lift pits
Key advantages
- Reacts with water and seals cracks that are damp or actively leaking, where epoxy fails
- Cures to a waterproof, closed-cell mass rather than a soft, absorbent plug
- Develops high compressive and tensile strength, so it structurally bonds as well as seals
- Low viscosity gives good injectability and penetration into fine cracks and capillaries
- On-site reactivity control with accelerator handles both slow deep filling and fast high-pressure leaks
- DIBt-tested for contact with soil and groundwater, suitable for environmental structures
- Bonds to concrete, brick and natural stone across a range of below-ground applications
- Meets building material class B2 to DIN 4102 for reaction to fire
Limitations & considerations
- Requires a dedicated PU injection pump and packers; it is not a hand-applied or trowel product
- Reaction is triggered by water, so gel and foam behaviour depend on how wet the crack actually is
- Foaming is limited and controlled, so it is a sealing and consolidation resin rather than a large-void filling foam
- Reactivity must be dialled in with accelerator on site; incorrect ratios affect gel time and expansion
- Uncured resin and isocyanates need proper PPE, ventilation and handling per the safety data sheet
- Best injected within the manufacturer’s application temperature window; very cold substrates slow the reaction
Selection & best practice
Start by mapping the crack and drilling injection ports (packers) at an angle so they intersect the crack behind the face, staggered on alternate sides and spaced to suit the element thickness. Flush the crack with water where practical to establish the flow path and to wet the substrate the resin needs to react against. Fit the packers, connect a single- or two-component PU injection pump, and inject from the lowest point upward, moving to the next packer once resin shows at it. Tune the reaction with MC’s accelerator: a faster gel for high-pressure, running-water leaks so the foam builds against the flow, and a slower reaction for fine, low-flow cracks so the low-viscosity resin travels deep before it sets. Keep the pump and lines clean and be ready with cleaner, since cured PU cannot be removed easily. Work within the recommended application temperature, wear the PPE specified in the SDS, and once the resin has set, remove packers and make good the surface. Always confirm exact ratios, gel times and coverage against the current MC-Bauchemie technical data sheet for the grade supplied.
Specifications
| Product type | Polyurethane (PU) based injection resin, water-reactive duromer |
| Chemistry / character | Water-displacing (hydrophobic); forms closed-cell rigid foam on contact with water |
| Viscosity | Low viscosity for good injectability into fine cracks |
| Reaction / foaming | Limited, controlled foaming; reactivity adjustable with accelerator |
| Cured strength | High compressive and tensile strength; waterproof |
| Substrates | Concrete, masonry and natural stone |
| Fire class | Building material class B2 per DIN 4102 |
| Environmental approval | DIBt-tested for impact on soil and groundwater |
| Application method | Pressure injection via packers using a PU injection pump |
Industry use cases
Basements & podiums
Stops active leaks and seepage through cracks and construction joints in retaining walls and rafts, curing waterproof even while water is still moving.
Tunnels & underground infrastructure
Seals joint and crack ingress in tunnel linings, shafts and underground car parks where the substrate cannot be dried before repair.
Water & sewage structures
DIBt groundwater testing makes it suitable for tanks, treatment works and sewage structures in contact with water and soil.
Ground & pit stabilisation
Consolidates loose subsoil and solidifies construction-pit enclosures, improving load capacity while sealing against ingress.
Heritage & masonry repair
Reinforces and re-bonds cracked masonry and natural stone, restoring integrity without demanding a fully dry substrate.
Frequently asked questions
Can MC-Injekt 2700 HV seal a crack that is actively leaking water?
Is it a one-component or two-component product?
Does it just plug the crack, or does it add strength?
What equipment do I need to apply it?
Is it safe for structures in contact with water and soil?
How do I control how fast it reacts?
How we position MC-Bauchemie MC-Injekt 2700 HV
MC-Injekt 2700 HV sits in Space Arc’s crack-injection line-up as the water-reactive PU resin for wet and leaking cracks, complementing MC-Bauchemie’s own epoxy injection resins (the MC-Injekt 1200-series and 2200-series) which are the right choice for dry, force-fit structural bonding of static cracks. For narrow, low-flow cracks needing deep saturation, ask us about the lower-viscosity 2700 L grade in the same family. Where a job also calls for surface-applied waterproofing or joint sealing around the injected repair, we can pair it with MC-Bauchemie coatings and sealants, or with equivalents from the other brands we distribute such as Fosroc, Sika and Dr. Fixit. Our team can specify packers, pumps and accelerator quantities alongside the resin so the complete injection system arrives together.
Fosroc Nitofill UR63 — Choose the Fosroc option when the job is already built around a Fosroc waterproofing specification or supply chain and you want a like-for-like water-reactive PU crack-injection resin for stopping active leaks.
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