About MC-Bauchemie MC-Injekt 2700 L

MC-Injekt 2700 L is the low-viscosity member of MC-Bauchemie’s MC-Injekt 2700 family — a two-component, cold-curing polyurethane resin engineered specifically for injection work rather than as a repackaged sealant. Where many site-level “PU injections” are really flexible, water-reactive foams meant only to stop a leak, 2700 L is a duromer system: once component A and component B react through the static mixer, the resin sets rigid and develops genuinely structural numbers — roughly 68 MPa in compression and 60 MPa in tension per the manufacturer’s EN ISO 604 and EN ISO 527-1 testing. That distinction matters on a jobsite. A crack sealed with 2700 L isn’t just watertight; it’s mechanically reconnected, which is why the product sits under “structural injections” in MC-Bauchemie’s own catalogue rather than under flexible waterstops.

For Indian applicators, the practical value is in the working-time control. Mixed neat, the resin stays workable for around 45 minutes at 20°C — enough time to set packers and inject a full crack run — but on an actively seeping basement wall or a fast-track pit-enclosure job, that same resin can be dialled down to well under a minute using MC-KAT 27 accelerator, dosed straight into component A before mixing. Its very low viscosity (~200 mPa·s) is what lets it travel into hairline cracks that thicker epoxy or cementitious grouts simply can’t enter, while its water-displacing behaviour means damp or lightly seeping cracks don’t have to be dried out first. As an authorised MC-Bauchemie distributor and applicator, Space Arc Engineering supplies 2700 L along with the MC-KAT 27 accelerator and MC-Additive ST thixotropy modifier, and can field trained two-component pump crews for Delhi NCR and pan-India injection contracts rather than leaving the product as a shelf item.

The technical insight

The naming convention inside MC-Bauchemie’s own range is the technical detail worth understanding before specifying: “2700” is the base rigid PU duromer chemistry, and “L” denotes the low-viscosity variant of it — not a separate product line. At ~200 mPa·s dynamic viscosity, 2700 L is thin enough to travel through crack widths that would stall a standard-viscosity resin or a cementitious grout, which is exactly why it’s positioned for hairline and fine-crack work rather than gap-filling. The other detail specifiers often miss is the accelerator curve: reaction time isn’t a single number but a dial, running from about 64 minutes with no MC-KAT 27 down to roughly 23 seconds at a 1% dose — meaning the same base resin can be tuned for a slow, controlled multi-packer injection run or for an active leak that needs to gel before it washes back out. Flexural stress data in the manufacturer’s datasheet also shows the resin still gaining strength well past initial set — from ~9.5 N/mm² at 24 hours to ~46.8 N/mm² at 10 days — so full mechanical capacity, and any load-bearing sign-off, should account for that cure curve rather than assuming next-day strength.

Where it is used

• Injection sealing of structural and non-structural cracks in RCC walls, slabs, columns and beams
• Consolidation and reinforcement of void-rich or porous masonry and natural-stone structures
• Sealing of construction-pit and diaphragm-wall enclosures against groundwater ingress
• Soil consolidation and curtain grouting in special foundation engineering
• Increasing load-bearing capacity of the subgrade beneath floor slabs and foundations
• Sealing of rigid, non-moving construction and expansion joints in buildings
• Basement, lift-pit and retaining-wall crack injection in below-grade civil structures
• Crack injection in water-retaining structures such as tanks, sumps and treatment-plant civil works

Key advantages

• Very low dynamic viscosity (~200 mPa·s) penetrates fine and hairline cracks that thicker epoxy or cementitious injection grouts cannot reach
• Reactivity is field-adjustable — 64 minutes down to about 23 seconds — by dosing MC-KAT 27 accelerator, so one product covers both controlled injection and fast-set active leaks
• Water-displacing with only limited, controlled foaming on contact with water, so it can be injected into damp or lightly seeping cracks without pre-drying
• Cures into a genuinely rigid, high-strength solid (~68 MPa compressive, ~60 MPa tensile) rather than a soft foam, restoring structural continuity across the crack
• Durable water impermeability once cured, backed by an Environmental Product Declaration and DIBt-referenced compliance relevant to groundwater and potable-water structures
• 18-month shelf life in original sealed packaging when stored between 5°C and 35°C in dry conditions
• Compatible with standard two-component high-pressure injection pumps (e.g., MC-I 700/710) and bore packers already used for MC’s other MC-Injekt systems
• Sold and backed in India by an authorised MC-Bauchemie distributor-applicator, so technical support and trained injection crews are available alongside the material

Limitations & considerations

• Two-component system with fast, temperature-sensitive reaction kinetics — needs a trained crew and calibrated pump, not a hand-mix or DIY repair product
• Application must stop once component or substrate temperature falls below 5°C, which constrains winter/early-morning work in cooler climates
• Cures rigid with essentially no elongation, so it is not suitable for joints or cracks expected to keep moving — a flexible PU or elastomeric sealant is the correct choice there
• Equipment cleaning requires MC-Verdünnung PU thinner, not water, adding site handling, ventilation and PPE considerations typical of solvent-based PU systems
• The ‘L’ (low-viscosity) grade is optimised for fine cracks; noticeably wider voids or gaps are better served by the standard-viscosity MC-Injekt 2700 or a staged injection approach
• Needs specialist equipment (static mixer, two-component pump, bore packers) and an experienced applicator to get dosing and packer spacing right, so it isn’t a low-cost DIY alternative to simpler crack fillers

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Injekt 2700 L

MC-Injekt 2700 L sits within MC-Bauchemie’s broader MC-Injekt structural-injection range alongside the standard-viscosity MC-Injekt 2700 — the two share the same rigid PU duromer chemistry and technical datasheet, with 2700 L formulated specifically for finer, hairline crack penetration and 2700 reserved for wider voids and gaps. For crews already running MC’s injection systems, MC-KAT 27 (accelerator) and MC-Additive ST (thixotropy modifier) are the matched accessories, and the same pump/packer setup (MC-I 700/710, MC-Bore Packer LS 18) carries across the family, which keeps equipment and technique consistent across a project. Where a specifier genuinely needs a flexible, moving-joint PU rather than a rigid structural resin, Fosroc’s Nitofill range (including its rigid, water-reactive WS60 grade and the more elastic UR63) is a recognised alternative brand in the Indian market for crack-injection work — Space Arc’s core supply and application strength, however, is on the MC-Bauchemie system, and for genuinely structural, force-transmitting crack repair MC-Injekt 2700 L remains the more directly comparable choice to what most specifiers are asking for when they call out a “rigid PU injection resin.”

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