MC-Bauchemie MC-Fastpack SewerInject
Cartridge-dispensed PU injection resin built to stop active water ingress in manholes, sewer joints, and underground structures — fast, without shutting the line down.
What is it?
A two-component, low-viscosity polyurethane injection resin that foams and expands on reaction to plug active water paths in concrete and masonry, supplied ready-to-use in MC-Fastpack double-chamber cartridges.
Where is it used?
Sewage and stormwater manholes, pipe-to-chamber connections, shaft ring joints, construction joints, sheet-pile and slotted-wall seals in groundwater, and cracks or cavities carrying or holding back water.
Why use it?
When a leak needs to be stopped now rather than after a multi-day cure, SewerInject reacts and expands within a short window and works in damp, dry, or actively flowing conditions without depending on a static water table to trigger it.
How is it applied?
Dispensed through the MC-Fastpack Power-Tool, a hand-held pneumatic gun, via a pre-set double-chamber cartridge and static mixer nozzle fed directly into packers drilled into the leak path — no field mixing, weighing, or pot-life guesswork.
About MC-Bauchemie MC-Fastpack SewerInject
MC-Fastpack SewerInject is MC-Bauchemie’s cartridge-based polyurethane injection resin, built specifically for the moment a manhole, chamber, or sewer joint is actively letting water in and someone needs it stopped without shutting the line down. It’s a low-viscosity, two-component PU duromer that’s supplied pre-dosed in a double-chamber cartridge rather than as loose tins to be weighed and hand-mixed on site. Fed through the MC-Fastpack Power-Tool — a compact pneumatic dispensing gun — it penetrates the fine crack or joint first, then reacts and foams into a closed-cell, uniform mass that plugs the water path from the inside.
What makes it useful for Indian sewage and infrastructure contractors specifically is that it doesn’t wait around for a static water table to trigger the reaction, and it doesn’t ask for a multi-day cure before the leak is actually gone. For Space Arc’s clients running municipal STPs, metro underground shafts, or basement utility ducts, that translates into fewer repeat mobilisations: a trained applicator drills packers along the leak path, meters the resin through the cartridge system, and can realistically close out several joints in a single manhole entry — the kind of turnaround a hand-mixed liquid resin with an open pot life struggles to match.
The technical insight
The distinguishing detail in SewerInject’s chemistry is that its foaming reaction isn’t triggered by contact with water the way many hydrophilic PU grouts are — it reacts on its own once the two components meet in the mixer nozzle. That matters on a live manhole or sewer joint because site conditions there are rarely consistent: a joint can be bone-dry when you drill the packer and actively seeping an hour later once groundwater finds the new path. A water-dependent resin can behave unpredictably across that swing; SewerInject’s reaction timing stays the same regardless. The closed-cell structure it foams into is also what lets it fill irregular, broken-out cavities behind a chamber wall rather than just bridging the visible crack face, which is the more common failure mode with liquid-only injection resins on rough masonry substrates.
Where it is used
- Sealing infiltration cracks and voids in RCC or brick manhole and inspection-chamber walls
- Stopping active water ingress at shaft ring joints in precast and cast-in-situ manholes
- Sealing pipe and liner branch connections where a pipe penetrates a manhole or chamber wall
- Injecting socket and pipe-to-pipe joint connections along underground drainage and sewer lines
- Sealing sheet-pile interlocks and slotted or diaphragm wall joints against groundwater
- Cavity and void filling behind linings in underground sewage and utility structures
- Pre-sealing running leaks in STP/ETP tank walls ahead of a flexible waterproofing topcoat
- Emergency leak-stopping in basements and underground cable/utility ducts before a permanent repair is scheduled
Key advantages
- Reacts and expands within a short window, so an active leak is stopped in one site visit rather than after a multi-day cure
- Foaming reaction doesn’t depend on standing or flowing water to trigger — it works in damp, dry, and actively wet joints alike
- Comes pre-dosed in a double-chamber cartridge, removing field weighing, batching, and pot-life guesswork from the applicator’s job
- Closed-cell expanded structure fills irregular voids and rough-broken cavities that a purely liquid resin would simply drain through
- MC-Fastpack Power-Tool dispensing lets one trained operator seal multiple joints in a single confined-space entry
- Low-viscosity resin penetrates fine hairline cracks before it starts expanding, instead of just bridging the surface
- REACH-assessed exposure scenarios for inhalation, application, and long-term water contact give specifiers a documented basis for sewer-line use
- Sold as part of a defined MC-Bauchemie system (packers, static mixers, Power-Tool) rather than a standalone tube needing improvised tooling
Limitations & considerations
- It’s a leak-stopping and void-filling resin, not a structural bonding adhesive — genuine structural cracks still need a rigid epoxy system such as MC-Fastpack 1264 compact
- Confined-space entry into a live manhole or sewer line still needs its own gas-testing and ventilation protocol; the resin doesn’t remove that requirement
- Application needs the MC-Fastpack Power-Tool or an equivalent compatible dispensing gun — it isn’t a hand-mixed, bucket-poured product
- Results depend heavily on correct packer placement and drilling angle into the actual water path, which needs a trained applicator rather than just the material
- As a rigid closed-cell PU foam, movement or thermally active joints still need a flexible sealant paired with it, not this alone
- Priced and packaged as a specialist contractor injection system, not a small DIY patch-repair product
Selection & best practice
Treat packer placement, not the resin, as the variable that decides whether the injection actually works: locate the true water path (it’s often offset from where the water is visibly showing), drill at an angle that intercepts it rather than straight into the visible crack face, and space packers close enough that the foam front from adjacent points overlaps. Dispense through the MC-Fastpack Power-Tool at a controlled, steady pressure — pushing too hard blows the resin past the target void instead of filling it. In live sewer or manhole entries, run gas-testing and ventilation exactly as your confined-space protocol requires before the crew goes in; the resin’s REACH-assessed exposure data supports safe use but doesn’t replace site safety procedure. Where the joint also needs long-term flexibility (thermal movement, differential settlement), follow up with a proper flexible sealant rather than relying on the rigid foam alone.
Specifications
| Chemical basis | Low-viscosity, polyurethane-based duromer (elastomeric) resin, two-component |
| Reaction trigger | Reacts and foams on mixing; does not require contact with water to initiate, so it works in dry, damp, or wet joints |
| Cured structure | Closed-cell, uniform and even pore structure with a high increase in volume on reaction |
| Delivery format | Pre-dosed MC-Fastpack double-chamber cartridge — no field mixing or batching required |
| Application equipment | MC-Fastpack Power-Tool: hand-held pneumatic dispenser with adjustable pressure and discharge volume control |
| Regulatory status | REACH-assessed exposure scenarios covering inhalation, application, and long-term water contact |
| Substrate/joint condition | Suitable for dry, damp, and actively water-bearing cracks, joints, and cavities |
| Product family | Part of MC-Bauchemie’s MC-Fastpack cartridge injection range, alongside 1264 compact, 2300 top, 2700, and Injekt LE |
Industry use cases
Municipal sewage networks
Sealing infiltration through cracked RCC or brick manhole shafts and chamber walls in operating sewer lines without taking the line out of service
Metro and underground infrastructure
Sealing segment joints, shaft ring joints, and pipe penetrations in below-grade metro shafts, pump houses, and utility tunnels
STP/ETP civil works
Arresting active leaks at construction joints and pipe entries in sewage or effluent treatment tank walls before a flexible waterproofing topcoat is applied
Basements and utility ducts
Plugging water ingress at cable duct and pipe sleeve penetrations through basement raft or retaining walls
Water-retaining and excavation works
Sealing sheet-pile interlocks and slotted diaphragm wall joints against groundwater during dewatering-sensitive excavation
Frequently asked questions
Does MC-Fastpack SewerInject work on actively flowing leaks, or only on damp, seeping cracks?
Is this the same resin I’d use for a structural crack in a beam or slab?
What equipment does my crew need to actually apply it?
Will it actually last inside a live sewer exposed to effluent and gases long-term?
How is this different from a hydrophilic PU grout that swells on contact with water?
Can Space Arc supply a small trial quantity before we commit to a full manhole rehabilitation order?
How we position MC-Bauchemie MC-Fastpack SewerInject
Within MC-Bauchemie’s own MC-Fastpack cartridge injection range, SewerInject sits alongside MC-Fastpack 1264 compact (a rigid, epoxy-based structural bonding and sealing resin), MC-Fastpack 2700 (a rigid PU sealing resin for concrete and masonry), MC-Fastpack 2300 top (a ductile, flexible PU resin for waterproofing joints), and MC-Fastpack Injekt LE (an expansion resin for waterproofing and load transfer) — all dispensed through the same Power-Tool platform, so a contractor already running one MC-Fastpack product can standardise tooling across the range. Space Arc typically pairs SewerInject with a rigid product like 1264 compact when a manhole has both a structural crack and an active leak, using SewerInject to stop the water first. Where a specifier has already standardised on Fosroc’s injection range, Nitofill WS60 is the closest named counterpart, though it’s positioned more narrowly around rigid crack water-stopping than SewerInject’s broader manhole and sewer-joint cartridge system.
Fosroc Nitofill WS60 — A specifier already standardised on Fosroc’s Nitofill range for structural crack water-stopping might choose Nitofill WS60 instead, though it’s positioned more for rigid crack injection than SewerInject’s cartridge-based manhole and sewer-joint focus.
Related Waterproofing products
Source MC-Bauchemie MC-Fastpack SewerInject for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.