MC-Bauchemie MC-Montan Injekt DS
A low-viscosity, ductile-elastic polyurethane injection resin from MC-Bauchemie’s specialist tunnelling range — built to seal moving cracks and water-bearing ground, and keep sealing them under structural movement.
What is it?
MC-Montan Injekt DS is a two-component, solvent-free polyurethane injection resin from MC-Bauchemie’s MC-Montan range, engineered for mining, tunnelling and underground civil works. Component A is a low-viscosity yellow polyol (density 0.98 g/cm³, 80 s DIN 53211/4 viscosity at 20°C); mixed with an isocyanate Component B and pumped through packers, it cures into a tough, ductile-elastic, water-displacing seal.
Where is it used?
Tunnel linings and rock joints, dam and hydraulic structures, drinking-water reservoirs, manhole ring joints and sewer pipe penetrations, diaphragm walls and basement construction joints, and loose water-bearing ground needing consolidation ahead of excavation.
Why use it?
Rigid epoxy or cementitious grouts stitch a crack shut and re-crack the moment the structure moves. This resin cures into a flexible elastomer that keeps moving with construction joints, seismic activity and settlement, so the seal doesn’t reopen at the same spot.
How is it applied?
Applied only by pressure injection — never as a cartridge sealant — through drilled ports or packers using twin-feed metering pumps, with mix ratio, packer spacing and resin grade set by a site trial injection and MC-Bauchemie’s method statement.
About MC-Bauchemie MC-Montan Injekt DS
MC-Montan Injekt DS belongs to MC-Bauchemie’s MC-Montan family, built for the toughest end of underground construction: mining galleries, metro and road tunnels, rock formations where water pressure and ground movement never really stop. Where general-purpose PU resins are formulated rigid and fast-reacting, DS is the ductile-elastic member of the range — it stays flexible after cure, displaces water rather than fighting it, and is assessed to DIBt principles for its effect on soil and groundwater.
For Indian sites, that matters in practice. Metro and highway tunnel segments flex under traffic and seismic load; irrigation dam joints see seasonal water-table swings; sewer manholes and pipe penetrations keep moving with soil settlement long after the concrete cures — conditions where rigid grout re-cracks. As an authorised MC-Bauchemie distributor and applicator, Space Arc Engineering supplies MC-Montan Injekt DS to Delhi NCR and pan-India project sites with the trained crews, metering pumps and packer-injection method statements this system actually needs — it isn’t a retail cartridge job.
The technical insight
The figure worth reading twice on the data sheet is Component A’s 80-second DIN 53211/4 efflux viscosity at 20°C — thin enough to travel into hairline cracks and capillary pores that heavier PU or epoxy resins simply bridge over. Paired with a 0.98 g/cm³ density, it penetrates ahead of the reaction front instead of just plugging the crack mouth. What separates the “DS” grade from stablemates like the fast-reacting FR or the rigid-foam FF is reaction chemistry tuned for ductility over speed or bulk — built to absorb joint movement, not resist it. The B2 fire rating (DIN 4102) and DIBt groundwater assessment are usually the first two compliance checks on tunnel and water-infrastructure tenders.
Where it is used
- Sealing active, moving cracks and joints in tunnel linings and shafts
- Waterproofing dam galleries, spillways and sluices under hydraulic pressure
- Joint sealing in structures storing or conveying drinking water
- Pre-consolidating loose, water-bearing rock or soil ahead of excavation
- Manhole ring-joint and pipe-penetration sealing in sewer networks
- Diaphragm wall and construction-joint sealing in deep basement excavations
- Hybrid injection with cement suspension for larger voids
- Retrofit leak-sealing of existing concrete under active hydrostatic pressure
Key advantages
- Cures ductile-elastic — keeps sealing through structural movement instead of re-cracking
- Very low viscosity (80 s, DIN 53211/4) penetrates hairline cracks and capillary pores
- Water-displacing and non-foaming — reacts and bonds even against actively flowing water
- Assessed to DIBt principles for soil and groundwater compatibility
- Fire class B2 to DIN 4102
- Published Environmental Product Declaration supports green-building documentation
- Can be hybridised with cement suspension to cut resin cost on larger voids
- Backed by MC-Bauchemie’s specialist mining and tunnelling engineering pedigree
Limitations & considerations
- Strictly a twin-component, pump-injected system — not a hand-cartridge product
- Needs trained operators and PPE; Component A is classified as an eye irritant
- Performance depends on correct packer spacing and pressure — a trial injection isn’t optional
- A sealing/waterproofing resin, not a structural strengthening grout — genuine structural cracks need a rigid epoxy system instead
- Reactivity must be matched to site water flow and pressure by picking the right MC-Montan Injekt grade
- Specialist pricing and application cost compared with generic single-component PU foams
Selection & best practice
Confirm crack width, water flow and expected structural movement first, then run a trial injection to fix packer spacing and pressure before committing full volumes — MC-Bauchemie’s method statement should be on site before work starts. Use trained applicators with proper twin-component metering pumps and PPE (eye protection, EN 374-rated gloves, respiratory protection in poorly ventilated spaces); Space Arc’s crews follow MC-Bauchemie’s site protocol end to end rather than treating this as a generic grouting job.
Specifications
| Product type | Two-component polyurethane (PU) elastomer injection resin, solvent-free |
| Component A colour | Yellow |
| Component A density (20°C) | 0.98 g/cm³ |
| Component A viscosity (20°C) | 80 s (DIN 53211/4 efflux cup) |
| Cure characteristic | Ductile-elastic; water-displacing and non-foaming |
| Fire classification | Class B2 per DIN 4102 |
| Environmental/groundwater assessment | Tested to DIBt principles for effects on soil and groundwater |
| Application method | Pressure injection via packers/drilled ports with a twin-feed metering pump |
| Component A auto-ignition temperature | 135°C (flash point not applicable) |
Industry use cases
Metro & road tunnelling
Sealing segment joints and rock fissures against groundwater ingress on Delhi NCR-area tunnel works
Dams & irrigation infrastructure
Leak-sealing galleries and sluice joints on state PWD/irrigation rehabilitation projects
Water utilities (WTP/STP/OHTs)
Joint sealing on drinking-water structures where DIBt-assessed groundwater compatibility is specified
Municipal sewer networks
Manhole ring-joint and pipe-penetration sealing during rehabilitation upgrades
Basements & deep foundations
Diaphragm wall and construction-joint leak retrofit on high-rise and metro-station excavations
Frequently asked questions
Is MC-Montan Injekt DS the same as a rigid PU foam injection resin?
Can it be used on structures that store or carry drinking water?
Will it seal a crack that’s actively leaking water?
What equipment does the applicator need on site?
How is DS different from MC-Montan Injekt FR or LE in the same range?
Does Space Arc supply and apply this, or only sell the material?
How we position MC-Bauchemie MC-Montan Injekt DS
MC-Montan Injekt DS sits alongside the rest of MC-Bauchemie’s MC-Montan Injekt range in Space Arc’s catalogue — pair it with the fast-reacting FR/FS grades for active water cut-off ahead of a final DS seal, LE where ground needs lifting, or the TR-X/TF acrylate systems for fine, low-pressure soil stabilisation. It isn’t a like-for-like swap with epoxy crack-injection or cementitious grouting systems (including Fosroc’s Conbextra grout range, also on Space Arc’s catalogue) — those solve structural stitching and load transfer, not flexible waterproofing. Fosroc doesn’t currently list a direct ductile-elastic PU counterpart here, so specifiers benchmarking internationally typically look at Sika’s PU injection systems; for Indian tunnelling and water-infrastructure work that genuinely needs flexible, groundwater-safe sealing, DS remains the specialist pick.
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