About MC-Bauchemie MC-Injekt GL-95 TR

MC-Injekt GL-95 TR sits in MC-Bauchemie’s structural injection range as the go-to acrylate gel for jobs where the leak is live, the crack is hairline, or the substrate needs a barrier that can move a little without failing. It’s not a repair mortar and it’s not trying to be one — it’s a sealant that gets pumped into the problem rather than smeared over it. The chemistry is a low-viscosity hydrogel built from Component A (itself blended on site from sub-components A1 and A2) and a separate catalyst, Component B, that’s dissolved in water at a dosage the applicator controls. That dosage is the whole trick of this product: at 0.2% catalyst in water you get a working time of roughly ten minutes, useful for deep or long injection runs; push it to 4% and the gel sets in under a minute, which is what you want when you’re trying to stop a live spring of groundwater before it washes your resin away. There’s also a dedicated retarder for jobs that need the pot life stretched out to well over an hour.

What earns this product its place on a waterproofing shortlist rather than a generic “injection resin” list is the DIBt general building authority approval specifically for injection into soil and groundwater, plus compliance with the German UBA guideline for materials in contact with potable water. Those aren’t marketing lines — they’re the kind of third-party sign-off that matters when a consultant is specifying curtain grouting around a metro shaft, a deep basement next to an existing foundation, or a service reservoir that can’t have anything questionable leaching into stored drinking water. In the Indian context, that translates to confidence on jobs where groundwater tables are high (much of the NCR belt during and after monsoon), where an existing structure is being underpinned, or where a UGT/OHT needs crack sealing without compromising water potability.

The technical insight

The number that does the real work on a technical data sheet like this is viscosity: MC-Injekt GL-95 TR sits at roughly 5-10 mPa·s, close to water, which is why it’s the material of choice when a crack has narrowed to a hairline and a PU or epoxy resin simply won’t travel into it before it starts to gel. Density of the mixed product is around 1.1 kg/dm³, and the mixing ratio is a straightforward 1:1 by volume between Component A and the water-dissolved Component B — but the reaction time is genuinely dosage-driven rather than fixed, ranging from about 50 seconds at 4% catalyst concentration down to roughly 10 minutes at 0.2%, and it more than doubles again at lower ambient temperatures. That control matters on site because gel time effectively sets how far the resin travels before it stops moving — too fast and you seal off the borehole before the crack network is filled; too slow on a live leak and you lose material to running water. Application is rated from 1°C to 45°C on the component and subsoil, which is a wider cold-end window than most PU injection systems offer, useful for winter work in north India. The cured gel’s pH sits around 8.1 and it’s rated fire class B2 to DIN 4102 in the injection medium — details a specifier will ask for on a documentation-heavy project even if they never come up on a routine crack-injection job.

Where it is used

• Injection sealing of active, damp or leaking cracks in concrete — basements, retaining walls, tunnel linings, lift pits
• Curtain (soil) injection around foundations, shafts and diaphragm walls to cut off groundwater before it reaches the structure
• Retrofitting a horizontal damp-proof course in old masonry walls suffering rising dampness
• Vertical sealing of masonry basement and retaining walls against lateral water ingress
• Sealing construction joints, cold joints and interfaces between adjoining buildings or structural pours
• Sealing joints and seepage paths in water-retaining structures (UGTs, OHTs, STPs) where potable-water contact compliance is required
• Groundwater cut-off injection for metro, tunnel and underground utility structures
• Sealing around pipe and service penetrations in below-grade concrete

Key advantages

• Very low viscosity (5-10 mPa·s) reaches hairline cracks that thicker PU or epoxy injection resins can’t penetrate
• Cured gel stays swelling and flexible, so it keeps sealing through minor structural movement and repeated wet-dry cycling instead of cracking out
• Reaction time is fully controllable on site via catalyst dosage — from under a minute to over an hour with the retarder — giving the applicator real control over injection radius
• DIBt general building authority approval for injection into soil and groundwater backs it for engineered, documentation-heavy projects
• Meets the UBA guideline for materials in contact with potable water, making it usable on drinking-water storage structures
• High resistance to alkaline environments suits long-term performance embedded in concrete and masonry
• Water-based system — tools clean up with water, no solvent handling or disposal hassle on site
• Wide low-temperature application window (down to 1°C) keeps injection work viable through north Indian winters

Limitations & considerations

• A sealant, not a structural repair material — it stops water, it doesn’t restore load-bearing capacity the way epoxy crack injection does
• Needs a proper injection concept, packer layout and trial injection first; not a product for an untrained crew to mix and pump on instinct
• Requires a twin-component metering/injection pump (MC-I 710 or equivalent) with an inline static mixer — not something you can hand-mix and syringe in
• Gel time is sensitive to both catalyst dosage and ambient/substrate temperature, so getting it right on a live, variable-flow leak takes an experienced applicator
• Cured gel is blue-tinted, which may need cosmetic treatment on visible finished surfaces
• Application must stop below 1°C component/subsoil temperature, and lines need to be flushed clean before the resin sets

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Injekt GL-95 TR

MC-Injekt GL-95 TR is one part of a broader MC-Bauchemie injection system, and it’s rarely specified alone — Space Arc typically supplies it alongside MC-Injekt GL-B (the catalyst component) and MC-Injekt Retarder GL for dosage control, with MC-Hammer or MC-Bore packers and, on larger jobs, the MC-I 710 injection pump. Where the leak is a fast-running void rather than a hairline crack, MC-Bauchemie’s PU-based injection resins (rigid or elastic grades within the same structural injection range) are the more usual pairing or alternative, chosen for speed of set against a running leak rather than for penetration into fine cracks. For crack injection aimed at restoring structural capacity rather than just sealing against water, that’s a separate epoxy-based product family entirely — GL-95 TR is not a substitute for structural crack repair. On the competitive side, Fosroc doesn’t carry a direct like-for-like acrylate hydrogel in its India lineup; specifiers benchmarking against Fosroc for crack or joint injection typically end up comparing against PU-based injection resins, which is a genuinely different chemistry and cure behaviour rather than a straight swap, so we’d rather flag that honestly than force a comparison that doesn’t hold up on the data sheet.

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