MC-Bauchemie MC-Injekt 2300
A low-viscosity PU resin that seals cracks the way rigid epoxy can’t — by moving with them, even under pressurised water.
What is it?
A two-component, low-viscosity, polyurethane-based elastomer injection resin engineered to cure fully flexible rather than rigid.
Where is it used?
Basements, retaining walls, water tanks, STPs/ETPs, sewer manhole and pipe joints, tunnel and metro shaft joints, construction joints in concrete and masonry.
Why use it?
It stretches with a crack instead of cracking again beside it — roughly 30-40% elongation, watertight to EN 1504-5, and stays flexible even in cold, wet underground conditions.
How is it applied?
Component A and B are mixed 3:1 by volume, repotted into an injection pump such as MC-I 520, and injected through bore packers set along the crack or joint.
About MC-Bauchemie MC-Injekt 2300
Most site engineers in Delhi NCR have seen the same failure pattern: a crack gets injected with a rigid epoxy or cementitious grout, the seal holds for a season, and then the same hairline reopens the moment the slab moves under thermal cycling or minor settlement. MC-Injekt 2300 exists for exactly that gap. It’s a low-viscosity, two-component polyurethane elastomer resin from MC-Bauchemie’s structural injection range, built to cure into a durably elastic mass rather than a brittle one — so when the crack breathes, the seal breathes with it instead of failing at the bond line.
The resin is mixed 3 parts component A to 1 part component B by volume, has a working time of roughly 40 minutes and a pot life around 100 minutes at lab conditions, and is then injected on a one-component basis into pre-set bore packers using a purpose-built pump (MC-I 520 is what MC-Bauchemie specifies). It’s low-surface-tension and non-foaming, so it penetrates fine cracks and cavities rather than bridging them with trapped air, and it’s rated to cure fully even under dynamic loading — relevant for basements near live traffic, metro shafts, or plant rooms with running machinery. For sites with strongly flowing or pressurised water, MC-Bauchemie’s own protocol is to stop the active flow first with the fast-reacting foam MC-Injekt 2133, then follow immediately with MC-Injekt 2300 for the permanent, ductile seal — the two products are meant to be used as a pair, not as alternatives to each other.
The technical insight
The number worth paying attention to on this datasheet is the glass transition temperature: -13.5°C dry, dropping to -34.3°C once the cured resin has taken up around 5% water (EN ISO 11357-2). In plain terms, most PU and epoxy injection systems stiffen up as they age in a damp, cool substrate — exactly the environment inside a below-grade basement wall or a buried manhole joint. MC-Injekt 2300 does the opposite: contact with residual moisture pushes its transition point further away from ambient site temperature, so it stays rubbery rather than glassy where it’s actually working. That’s a large part of why MC-Bauchemie can claim “durable” water impermeability under EN 1504-5 rather than just initial watertightness — the elasticity the product needs on day one is engineered to persist, not fade, in wet service conditions.
Where it is used
- Sealing dormant and slow-moving cracks in RCC basement walls, rafts and retaining walls under dry to pressurised-water conditions
- Permanent ductile seal following an initial MC-Injekt 2133 foam injection on active, strongly flowing leaks
- Grouting of injection hoses/tubes cast into construction joints (kicker joints, wall-to-raft junctions)
- Waterproofing of pipe and liner penetrations into sewer manhole and shaft structures
- Sealing manhole ring joints, socket joints and pipe penetrations in wastewater infrastructure
- Injection sealing of joints and cracks in tunnel linings, metro shafts and other underground civil structures
- Water-retaining structures — STPs, ETPs, UGT/OHT tanks, pump houses, lift pits
- Moisture and joint sealing where the structure will continue to see thermal or minor structural movement after repair
Key advantages
- Genuine ductility — roughly 30-40% elongation, so it follows crack movement instead of debonding and reopening
- Documented to stay flexible in cold, wet service conditions (glass transition drops to -34.3°C with 5% water uptake), unlike systems that stiffen underground over time
- Low viscosity (~150 mPa·s) and low surface tension give it real penetration into hairline cracks rather than just bridging the surface
- Non-foaming reaction — the seal forms from controlled resin fill, not from unpredictable volume expansion
- Cures fully even under dynamic/vibration loading, relevant near live traffic, transformers or rotating plant
- CE-marked to EN 1504-5 with a stated performance class, and referenced against DAfStb and ZTV-ING — useful when a consultant wants standards on the submittal, not just a brand name
- Pairs formally with MC-Injekt 2133 for active leaks, so the specifier gets a two-step protocol for wet and dry cracks rather than one resin stretched to cover both
- Backed by an 18-month shelf life and a documented mixing/injection procedure, which keeps site QA straightforward for a trained crew
Limitations & considerations
- A two-part reactive resin with a fixed 3:1 mixing ratio — needs a trained applicator and calibrated pump, not a DIY or unsupervised-labour product
- Working time (~40 min) and pot life (~100 min) are temperature-dependent; peak-summer site temperatures in Delhi NCR will shorten both, so batch sizing and resin cooling need planning
- Purely a flexible waterproofing seal — it does not restore structural load transfer across a crack, so it’s the wrong choice where the specification calls for a rigid, load-bearing epoxy repair
- Application is specified down to 5°C substrate/component temperature; not a constraint in most of India but worth noting for high-altitude or early-morning winter pours
- Equipment must be cleaned with MC-Verdünnung PU thinner within working time — water cannot be used, which means solvent handling and disposal discipline on site
- Costs more per litre than cementitious injection grout, so it’s worth specifying only where the crack is genuinely expected to move — for truly static cracks a cheaper system may suffice
Selection & best practice
Treat the leak diagnosis as the first deliverable, not the injection itself — MC-Bauchemie’s own guidance calls for investigating the structure and mapping every leak point before packers go in, and a trial injection is genuinely worth the half-day it costs on any job with unfamiliar substrate. Set bore packers at spacing matched to the crack width and wall thickness rather than a fixed default, and where water is actively running, don’t reach for MC-Injekt 2300 first — knock the flow down with MC-Injekt 2133’s fast-foaming reaction, then follow through immediately with 2300 for the permanent elastic seal while the packers are still live. In Delhi’s summer months, keep both components shaded and, if batch size allows, pre-cool them — a 40-minute working time can run short once ambient and substrate temperatures both sit north of 35°C. Repot mixed resin into a clean container before charging the pump, and never let solvent-cleaning water anywhere near the equipment. Finally, check the crack width and expected movement against the EN 1504-5 W(2) rating before specifying — where structural, load-transferring repair is actually needed, this is the wrong product family; MC-Bauchemie’s rigid epoxy injection systems are the correct call there.
Specifications
| Chemistry / base | Low-viscosity, two-component polyurethane elastomer resin |
| Mixing ratio (A:B) | 3 : 1 by volume; 100 : 41 by mass |
| Density (mixed) | approx. 0.98 kg/dm³ (EN ISO 2811-1) |
| Viscosity | approx. 150 mPa·s (EN ISO 3219) |
| Working time | approx. 40 minutes |
| Pot life / reaction time | approx. 100 minutes |
| Application temperature | 5 °C to 40 °C (component and substrate) |
| Tensile strength | 0.28 – 0.46 N/mm² on concrete, dry/moist (EN 12618-1) |
| Elongation (free strain) | approx. 40% (EN ISO 527-1) |
| Standard / classification | CE per EN 1504-5: U(D1) W(2) (1/2/3/4)(5/40), U(D2) W(2)(2)(5/40) |
| Pack sizes | Two-component kits, 10 l and 30 l (also boxed as 6 x 1 l) |
| Shelf life | 18 months, sealed, 5-30°C, dry storage |
Industry use cases
Residential & commercial basements
Sealing construction-joint and crack leakage in raft-to-wall junctions of below-grade basements in NCR high-rises, typically following an MC-Injekt 2133 pass where the leak is actively running.
Water & wastewater infrastructure
Sealing manhole ring joints, pipe penetrations and socket joints in sewer shafts, plus lining joints in STPs and ETPs where continuous water contact and periodic movement rule out a rigid resin.
Metro, tunnels & underground structures
Injection sealing of segment and shaft joints subject to vibration and thermal movement, where the resin needs to keep curing and stay elastic under dynamic load.
Water-retaining structures
UGT/OHT tanks, pump houses and lift pits where hydrostatic pressure and long-term potable/process water contact both apply.
Retrofit waterproofing
Injection retrofit on existing structures with hairline cracking from settlement or thermal cycling, where re-cracking after a rigid repair is the specific failure being designed against.
Frequently asked questions
How is MC-Injekt 2300 different from MC-Injekt 2133?
Can this be used on a live, actively running leak?
Is this the same thing as epoxy crack injection?
What application temperature range works for Indian sites?
What equipment does an applicator need on site?
How is it packed and stored for Indian project sites?
How we position MC-Bauchemie MC-Injekt 2300
Within MC-Bauchemie’s own injection range, MC-Injekt 2300 is the flexible, elastomeric option and is meant to be specified alongside — not instead of — MC-Injekt 2133 (the fast-foaming resin for active, pressurised leaks) and MC-Bauchemie’s rigid epoxy injection systems (for structural, load-transferring crack repair). Variants such as MC-Injekt 2300 flow and MC-Injekt 2300 top exist in the same family for different viscosity and application-geometry needs; Space Arc, as an authorised MC-Bauchemie distributor and applicator across Delhi NCR and pan-India, can advise on which variant actually fits a given crack width and orientation rather than defaulting to the standard grade.
Where a project is already standardised on Fosroc systems, or the immediate need is a fast, closed-cell seal on a live leak rather than a fully elastomeric fill, Fosroc’s Nitofill UR63 — a two-part, solvent-free, low-viscosity PU injection resin — is a genuine equivalent worth considering; MC-Injekt 2300’s documented EN 1504-5 performance class and wider elongation range are the trade-offs a specifier would be weighing against it. For structural (non-flexible) crack bonding, treat this entire product family as the wrong tool and ask for an epoxy injection system instead.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.