Master Builders Solutions MasterRoc MP 368 TIX
A fast-reacting, thixotropic injection resin engineered to consolidate fractured rock, stop water and gas ingress, and hold ground in place on tunnelling and mining faces.
What is it?
A two-component, solvent-free polyurea silicate injection resin with a thixotropic, non-flowing gel consistency, purpose-built to consolidate loose or fractured rock and seal water/gas ingress in underground works.
Where is it used?
Tunnel faces, TBM drives, metro and rail underground sections, mine drives and shafts, hydropower headrace/tailrace tunnels, and any jointed or fractured strata where a plain cementitious grout would simply flow or wash out of the crack.
Why use it?
It gels within minutes even on cold, wet rock faces, stays exactly where it is injected instead of running down open fissures, and builds meaningful bond strength in about 30 minutes and full design compressive strength inside 24 hours – fast enough that a tunnelling crew is not left waiting on the grout.
How is it applied?
Metered through a calibrated two-component injection pump and delivered via packers drilled into the rock face, with Part A and Part B mixed at the nozzle; the thixotropic gel sets almost immediately, filling voids and sealing fissures before the uncured resin can escape into open cracks.
About Master Builders Solutions MasterRoc MP 368 TIX
MasterRoc MP 368 TIX belongs to Master Builders Solutions’ MasterRoc range for underground construction – the part of the MBS portfolio built specifically for tunnelling, mining, and rock engineering rather than the more familiar cementitious grouts used on building sites above ground. Chemically, it is a two-component, solvent-free polyurea silicate resin: Part A and Part B react rapidly the moment they are mixed at the injection nozzle, and the “TIX” in the name signals that this version has been thickened to a thixotropic gel consistency. That single change matters more than it sounds – in open, sloping, or heavily fractured rock, a free-flowing resin can simply run out of the crack before it gels, wasting material and leaving the void unsealed. MP 368 TIX stays where it is pumped and gels almost on contact, which is exactly what a tunnelling crew needs when consolidating broken ground or shutting off an active water seep on a live face.
For Space Arc, this is a deliberately narrow, specialist listing rather than a volume product. It earns its place in our grouts portfolio because Delhi NCR and the wider Indian tunnelling market – metro corridor extensions, hydropower headrace tunnels through jointed Himalayan rock, and hard-rock mining drives – regularly run into exactly the fractured, wet-ground conditions this resin was built for, and there is no honest substitute for it in a standard cementitious or epoxy grout catalogue. We source it against confirmed project requirements rather than holding it as shelf stock, and we say so plainly: if your scope is anchor grouting, bedplate grouting, or general structural repair, a MasterFlow or MasterEmaco product from our regular range is almost certainly the better fit, and cheaper. MP 368 TIX earns its cost only when the job is genuinely about holding fractured rock together or stopping water through a joint that ordinary grout would simply wash out of.
The technical insight
The chemistry that separates MP 368 TIX from an ordinary injection grout is the combination of a polyurea silicate reaction system with a deliberately thixotropic rheology. Most injection resins are formulated to be thin and free-flowing so they penetrate fine voids easily – but in open, sloping, or heavily jointed rock, that same low viscosity means a large share of the resin simply runs out of the fissure before it gels, wasted, with the void left unfilled. MP 368 TIX is thickened to behave like a gel the moment mixing starts: it moves under injection pressure but stops moving as soon as that pressure is removed, so it stays inside the crack it was pumped into. Paired with a fast-reacting, solvent-free two-part system that is unaffected by ambient water, this lets crews consolidate genuinely wet, broken ground – the kind of face condition where cementitious micro-fine grouts, and even standard polyurethane foams, tend to struggle – without over-consuming material or leaving unfilled pockets behind the injected zone.
Where it is used
- Rock-mass consolidation ahead of TBM cutterhead advance in mixed or fractured ground
- Face heading stabilisation in soft or broken strata during tunnel excavation
- Pre-grouting of fissured rock in mine drives, shafts, and headings
- Sealing active water or gas ingress through open rock joints and bedding planes
- Crack and joint sealing in tunnel lining, shotcrete, and cross-passages
- Ground consolidation around shaft collars and adit portals
- Stabilising loose strata ahead of rock bolting and shotcrete support
- Localised, high-strength concrete crack injection where the substrate stays damp
Key advantages
- Thixotropic gel stays inside the fissure it was injected into instead of running off, cutting resin wastage on open or sloping cracks
- Solvent-free two-component polyurea silicate chemistry keeps VOC exposure down in confined underground spaces
- Mixes and reacts reliably down to 5°C, useful on cold tunnel faces and high-altitude Himalayan project sites
- Builds meaningful bond strength in around 30 minutes and exceeds 25 MPa compressive strength within 24 hours
- Non-water-absorbing formulation does not swell or lose strength when the surrounding rock stays wet
- Fire-resistant formulation adds a real safety margin in enclosed tunnelling and mining environments
- Strong adhesion to damp rock, concrete, and low-friction or contaminated surfaces
- Combines high structural strength with enough flexibility to tolerate minor ground movement without cracking out
Limitations & considerations
- Needs a calibrated two-component injection pump, packers, and a trained crew – this is not a hand-mixed or trowel-applied product
- Accurate Part A / Part B proportioning is essential; field mixing errors change gel time and final strength
- A specialist, project-driven import in India rather than shelf stock, so lead time and minimum order quantities need planning ahead
- Costs considerably more per litre than cementitious injection grout, which only makes sense where fissure-holding and fast set genuinely matter
- Working (pot) life once mixed is short, so stop-start injection schedules can waste material if not sequenced well
- Consolidates ground and seals fissures – it is not a substitute for a structural anchor or bearing-plate grout
Selection & best practice
Treat MP 368 TIX as a specialist tunnelling and mining input, not a general-purpose grout: run a short trial injection on the actual rock condition first to confirm packer spacing, injection pressure, and gel time behave as expected before committing to a full pattern. Keep Part A and Part B proportioning under strict volumetric control at the pump – because the resin is thixotropic, a poorly calibrated ratio shows up as either premature gelling in the lines or a soft, under-strength fill rather than an obvious visual defect. Confirm rock face and material temperature before mixing, since reaction speed shifts with temperature even though the system is rated down to 5°C. Store both components in a dry, temperature-controlled area and use within the stated shelf life, and make sure the injection crew has proper PPE and ventilation given the confined-space, two-component nature of the work. Space Arc can help plan pack quantities against drive length and joint density, and coordinate MBS-trained applicator support for the initial mobilisation on a new project.
Specifications
| Chemistry / System | Two-component, solvent-free polyurea silicate injection resin, thixotropic formulation |
| Consistency | Non-flowing thixotropic gel immediately after mixing |
| Compressive Strength | Exceeds 25 MPa (3,600 psi) at 24 hours |
| Bond Strength | Approx. 5 MPa (725 psi) achieved within 30 minutes |
| Application Temperature | Mixes and reacts effectively down to 5°C (40°F) |
| Water Behaviour | Non-water-absorbing; does not expand or lose strength in the presence of water |
| Fire Performance | Fire-resistant formulation |
| Pack Format | Supplied as two-component (Part A / Part B) kits; Part B available in 28 kg containers |
| Primary Function | Rock and ground consolidation with fissure/void sealing in fractured or jointed strata |
Industry use cases
Metro & Urban Rail Tunnelling
Consolidating fractured or mixed-face ground ahead of TBM advance on metro corridor extensions, and sealing water ingress at cross-passages and adits.
Hydropower & Water Tunnels
Sealing water-bearing joints in headrace and tailrace tunnels driven through jointed Himalayan rock, where standard cementitious grout washes out.
Underground Mining
Stabilising drives and shafts in fractured hard-rock mines, holding loose strata ahead of rock bolting and shotcrete support.
NATM / Conventional Tunnelling
Emergency ground consolidation on a fractured or over-breaking face where shotcrete alone cannot hold the ground until support is installed.
Underground Structures – Repair
Injecting active cracks and joints in existing tunnel lining or shotcrete where the substrate stays damp and a rigid, high-strength fill is required.
Frequently asked questions
Is MasterRoc MP 368 TIX the same product as MasterRoc MP 368?
Can this be used as a structural anchor or bearing-plate grout?
Does it work in wet rock or where water is actively moving through joints?
What equipment and crew do we need on site to use it?
How quickly does it set and gain strength?
Is it available off the shelf in India, or does it need to be ordered in?
How we position Master Builders Solutions MasterRoc MP 368 TIX
MasterRoc MP 368 TIX sits inside Master Builders Solutions’ MasterRoc range for underground construction, alongside the standard-viscosity MasterRoc MP 368, other MasterRoc injection and rock-bolting resins, and TBM conditioning products that Space Arc can source together as a package for a single tunnelling or mining contract. It is a genuinely different product family from the cementitious MasterFlow and MasterEmaco grouts Space Arc stocks for machine-base grouting and structural concrete repair – those remain the right choice for anchor and bedding work, while MP 368 TIX is a specialist call-out item for geotechnical and tunnelling scopes specifically. On the Fosroc side, the closest thing in that catalogue is the Conbextra family of cementitious bedding and anchor grouts, which addresses structural and bearing-plate grouting rather than fractured-rock consolidation or fissure sealing – so there isn’t a genuine like-for-like Fosroc substitute for this product, and specifiers comparing options should look at other tunnelling-grade polyurethane/polyurea resin suppliers rather than treating it as a Fosroc-vs-MBS decision.
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