About MC-Bauchemie MC-Injekt GL-95 TX

MC-Injekt GL-95 TX is a two-component, polymer-modified acrylic (acrylate) injection resin from MC-Bauchemie’s MC-Injekt range, built specifically for cracks, joints and cavities that sit in permanent water contact — basements, retaining walls, lift pits, tunnels, tanks. Unlike epoxy injection resins that cure hard and bond structurally, GL-95 TX cures into a soft, rubber-like hydrogel: light-blue, around 1.1 kg/dm³ in density, with an elongation at break of roughly 396%. That flexibility is the whole point. A crack in a below-grade wall keeps moving fractionally with seasonal groundwater and temperature, and a rigid epoxy plug in that crack eventually re-cracks. GL-95 TX moves with it, and additionally swells 20-30% on renewed contact with water, so it keeps closing the gap even if the crack opens up slightly wider than it was on injection day.

The resin is a two-part system — Component A (built up on site from A1, A2 and A3) and Component B dissolved into B1 — pumped through a twin-component injection pump in a 1:1 ratio by volume, with reaction time tuned from roughly 14 seconds up to about 125 seconds simply by varying how much Component B goes into the B1 solution, or stretched out to nearly half an hour with MC-Injekt Retarder GL for large curtain-injection jobs. It carries a DIN EN 1504-5 classification and meets the German UBA guideline for materials in contact with drinking water, which is why specifiers reach for it on potable-water-tank and STP joints as much as on leaking basements. In Space Arc’s Delhi NCR and pan-India project experience, this stays a specialist-crew product rather than a retail one — it earns its keep on jobs where re-excavating and re-waterproofing from the outside simply isn’t an option.

The technical insight

The number worth understanding on this datasheet is the Component B percentage dissolved in B1 — that one dial sets your working window. At around 4% B-in-B1 the gel sets in roughly 14 seconds, useful for fast-flowing water or fine, high-pressure leaks where the resin would otherwise wash out before it could gel. Drop to about 0.2% and reaction time stretches to roughly 125 seconds, giving crews time to fill larger voids or longer packer runs before the material sets. Viscosity sits around 40 mPa·s — close to a light mineral oil — which is what lets it penetrate hairline cracks that a thicker epoxy or even a PU foam would bridge over rather than fill. The DIN EN 1504-5 classification U(S2)W(1)(2/3/4)(1/40) confirms it’s rated for structural crack-injection use under water-pressure conditions, not just as a surface damp-seal.

Where it is used

• Sealing injection of cracks, joints and cavities in concrete and masonry that sit in permanent water contact — basements, retaining walls, lift pits, tunnels.
• Sealing and bonding injection around HDPE membrane lining laps and geomembrane seams in tanks, tunnels and reservoirs.
• Subsequent exterior curtain injection around foundations and basement walls when re-excavating to waterproof from outside isn’t practical.
• Horizontal and vertical barrier injection against rising damp in older masonry walls.
• Sealing construction and cold joints via embedded injection hoses or surface packers.
• Sealing joints in potable water tanks, STPs/WTPs and swimming pools where drinking-water contact compliance matters.
• Sealing metro, tunnel-lining and other underground structures exposed to fluctuating hydrostatic pressure.
• Remedial leak-sealing of active hairline cracks that keep weeping after a first round of surface waterproofing.

Key advantages

• Stays flexible after cure (elongation ~396%) so it follows a crack that keeps moving instead of re-cracking like a rigid epoxy plug would.
• Swells 20-30% on renewed water contact, effectively self-healing if the crack widens slightly after the original injection.
• Very low viscosity (~40 mPa·s) penetrates hairline cracks that thicker resins tend to bridge over rather than fill.
• Reaction time is fully adjustable — roughly 14 to 125 seconds by dosage, or stretched to ~28 minutes with MC-Injekt Retarder GL for large-volume work.
• Freeze-thaw resistant and stable in the alkaline pore water typical of concrete and masonry.
• Meets the UBA guideline for materials in contact with drinking water, so it’s usable on potable tanks and reservoirs, not just basements.
• Bonds well to both dry and damp substrates, and to HDPE membrane, without needing bone-dry site conditions.
• Equipment cleans up with plain water within the pot life, cutting solvent handling and downtime versus solvent-based injection systems.

Limitations & considerations

• It seals; it doesn’t structurally repair. For cracks needing load-bearing restoration, an epoxy system such as MC-Injekt 2300 NV is the right tool, not this one.
• Needs a proper twin-component metering pump (MC-I 700 or equivalent) and a trained operator — not a cartridge-gun DIY product.
• Reaction time is temperature-sensitive, so the B:B1 ratio needs a quick site trial whenever ambient or substrate temperature shifts meaningfully.
• The cured gel is a flexible seal, not a wearing surface — it needs to stay covered or protected, not exposed to foot traffic, abrasion or UV.
• Component packs (27.6 kg/110 kg A1, 25.8 kg/103.2 kg B1, plus smaller A2/A3/B boxes) are sized for specialist contractors, not economical for a single small patch.
• Getting the A1:A2:A3 or B:B1 ratios wrong changes gel time and can compromise the seal, so this stays a supervised-crew application rather than a self-service one.

Selection & best practice

Specifications

Industry use cases

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

Within MC-Bauchemie’s own MC-Injekt range, GL-95 TX sits alongside structural epoxy systems like MC-Injekt 2300 NV (for bonding static, non-moving cracks) and flexible polyurethane options like MC-Injekt 1264 TX (for stopping fast, actively-running water). GL-95 TX is the one to reach for when the crack needs to stay sealed while it keeps moving and weeping, and especially when drinking-water contact compliance is part of the brief. Where a project is already standardised on Fosroc, or a specifier prefers polyurethane over acrylic chemistry for the same job, Fosroc’s Nitofill PU25 LV is a genuine equivalent — a two-component, low-viscosity, elastic PU injection resin aimed at the same fine, damp, moving-crack scenario. The choice between the two usually comes down to which chemistry the site prefers and which system the applicator crew is already trained on, rather than one being categorically better than the other.

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