MC-Bauchemie MC-DUR Grout LE
A three-component, low-exotherm epoxy grout built for machine foundations, baseplates and heavy dynamic loads.
What is it?
A three-component, solvent-free epoxy resin grout — resin, hardener and a pre-graded silica filler — engineered for non-shrink, high-strength grouting under machinery and structural baseplates.
Where is it used?
Machine and compressor foundations, motor/generator/pump baseplates, rail tracks and anchor bolts, wind turbine tower bases and other equipment under dynamic or vibratory load.
Why use it?
Reaches ≥70 N/mm² compressive strength within 24 hours, stays dimensionally stable (non-shrink), and its low peak exotherm (~38-41°C) avoids the thermal micro-cracking that ordinary high-strength epoxy grouts risk in thick pours.
How is it applied?
Resin and hardener are hand-mixed first, then blended with the pre-weighed filler; the flowable grout (200mm flow per IS 5512) is poured continuously from one side within its ~45-minute pot life, targeting over 85-95% effective bearing area (EBA) under the baseplate.
About MC-Bauchemie MC-DUR Grout LE
MC-DUR Grout LE is MC-Bauchemie’s answer to a problem every rotating-equipment engineer knows well: high-strength epoxy grouts cure fast and hot, and in a thick pour under a compressor or turbine baseplate that heat build-up can crack the very grout meant to hold the machine steady. MC-DUR Grout LE is supplied as three pre-weighed components — a resin, a hardener and a graded silica filler bag — mixed on site in a fixed 4.5:0.9:27 ratio by weight. Being solvent-free, it doesn’t off-gas strong fumes into enclosed plant rooms, and because the filler arrives pre-packed and ready to use, the batching errors that plague field-proportioned epoxy systems are largely designed out. The result is a flowable, self-levelling grout that reaches ≥70 N/mm² compressive strength within 24 hours and climbs to ≥85 N/mm² by 28 days (as per ASTM C579) — strength most cementitious non-shrink grouts simply cannot touch — delivered with a controlled peak exotherm of roughly 38-41°C that keeps thermal cracking off the table even at pour depths up to 125mm.
For Space Arc’s clients across Delhi NCR and pan-India project sites, this is the grout that goes under machinery meant to run for decades under vibration — compressor skids, generator sets, crane rail beams, wind turbine tower bases, rail fixings — where a cementitious grout’s lower fatigue resistance and shrinkage risk aren’t worth the cost saving. It sits within MC-Bauchemie’s wider MC-DUR epoxy range alongside variants such as MC-DUR Grout LE-10 for different flow and pour requirements, and pairs naturally with the brand’s MC-DUR structural repair mortars when a foundation needs both fresh grouting and concrete patch-up. As an authorised MC-Bauchemie distributor and applicator, Space Arc supplies the material with traceable batch packaging and can also put a trained crew on site — a real factor for a grout where mixing sequence and pour timing genuinely decide whether the target EBA gets hit.
The technical insight
The “LE” in the name stands for low exotherm, and it isn’t just a marketing tag — it’s a measured property. Epoxy resin cures through an exothermic reaction, and ordinary high-strength epoxy grouts can push internal pour temperatures well past 60-70°C in a mass pour, more so in Indian summer ambient heat where the reaction accelerates further. The resulting temperature gradient between a hot curing core and a cooler outer surface is exactly what triggers micro-cracking in thick sections. MC-DUR Grout LE’s resin-hardener-filler ratio is formulated specifically to cap peak exotherm at roughly 38°C at 25°C ambient and ~41°C at 30°C ambient (tested per ASTM D2471 on a 415ml volume) — which is why MC-Bauchemie rates it for single-lift pours up to 125mm, a genuinely useful depth for most machine foundation pockets without resorting to staged lifts. The trade-off is a shorter pot life of around 45 minutes; the same chemistry that suppresses heat build-up also tightens the working window compared with some ordinary epoxy grouts, so pours need to be fully planned and formwork checked before mixing even starts.
Where it is used
- Machine and compressor foundation grouting under dynamic/vibratory load
- Motor, generator, gearbox and pump baseplate grouting
- Wind turbine tower base grouting
- Crane rail and gantry girder precision grouting
- Rail track panel grouting and anchor bolt/bolt-pocket fixing
- Re-grouting of heavy machinery foundations after vibration-induced failure
- Bridge bearing pedestal and structural steel column baseplate grouting
- High-load anchor fixing in industrial and infrastructure structures
Key advantages
- Non-shrink, volumetrically stable — keeps full, permanent contact under the baseplate so machinery doesn’t work loose over time
- High early strength (≥70 N/mm² in 24 hours per ASTM C579) lets equipment go back into service faster than most alternatives
- Low, controlled peak exotherm (~38-41°C) largely eliminates the thermal micro-cracking risk that plain high-strength epoxy grouts carry in thick pours
- Solvent-free formulation — safer for site crews and no strong fumes in enclosed plant rooms or basements
- Pre-weighed, pre-packed resin/hardener/filler components reduce on-site batching mistakes
- Good flowability (200mm per IS 5512) fills complex bolt-pocket geometries and achieves high effective bearing area, over 85% and up to 95%+ with correct technique
- Rated for single-lift pours up to 125mm, cutting down on staged-pour labour for typical machine foundation depths
- Well suited to dynamic/vibratory load applications — wind turbines, compressors, rail — where cementitious grouts fatigue faster
Limitations & considerations
- Roughly 45-minute pot life leaves little margin for error — large pours need formwork, filler bags and manpower staged and ready before mixing starts
- Application must stop outside a 5-45°C surface temperature window, which needs planning around Delhi’s peak summer afternoons and winter mornings
- Needs rigid, leak-proof formwork with a maximum 50mm shoulder length; loose or poorly sealed shuttering wastes an expensive epoxy system through leakage
- Costs meaningfully more per kg than a standard cementitious non-shrink grout, so it’s best reserved for genuinely dynamic, high-strength applications rather than routine baseplate work
- 125mm is the tested single-pour depth — deeper foundation pockets need staged, multi-lift grouting rather than one continuous pour
- Fixed three-component mixing (4.5:0.9:27 by weight) rewards an experienced applicator; incorrect ratios directly affect strength and cure behaviour
Selection & best practice
Treat the pot life as the schedule, not a guideline. Get the substrate hydro-blasted clean and fully dry, the rigid formwork built and checked for leaks, and every bag or bucket of resin, hardener and filler staged at the pour point before opening the first pail. Mix resin and hardener for about a minute, decant into a clean container and remix, then blend in the filler only once the pour team is genuinely ready to go continuously from one side. Pour through a funnel or pipe rather than free-falling the grout, work from the middle outward on larger areas, and keep vibration and shock away from the grout for the first several hours of cure. In Delhi’s summer, plan pours for early morning or evening when surface temperatures sit comfortably under the 45°C cut-off; in winter, confirm the surface is above 5°C before starting. Space Arc’s application crews follow this sequence on every MC-DUR Grout LE pour and can advise on staged lifts where foundation depth exceeds the 125mm single-pour rating.
Specifications
| Chemistry / System | Three-component, solvent-free epoxy resin grout with graded silica filler (resin + hardener + filler) |
| Density (mixed) | 2.2 ± 0.05 kg/lit at 30°C |
| Compressive Strength (ASTM C579) | ≥70 N/mm² @ 24 hrs, ≥80 N/mm² @ 7 days, ≥85 N/mm² @ 28 days |
| Flowability | 200mm per IS 5512 @ 30°C |
| Pot Life | ~45 minutes (100g mass, per FIP 5.1) |
| Peak Exotherm (ASTM D2471, 415ml) | ~38°C @ 25°C ambient / ~41°C @ 30°C ambient |
| Max Single-Lift Pour Depth / EBA | Up to 125mm, >85% effective bearing area (>95% achievable with correct technique) |
| Mixing Ratio (by weight) | Resin : Hardener : Filler = 4.5 : 0.9 : 27 |
| Standard Pack / Kit Size | Resin 4.5kg (5kg bucket) + Hardener 0.9kg (1kg bottle) + Filler 27kg (PP bag) ≈ 32.4kg kit |
Industry use cases
Power & Energy
Grouting under turbine, generator and compressor baseplates at thermal and gas power plants, where vibration and thermal cycling call for a non-shrink, low-exotherm epoxy system rather than a cementitious grout.
Cement & Heavy Process Plants
Foundation grouting for crushers, compressors and heavy rotating equipment, where high 24-hour strength shortens equipment commissioning downtime.
Wind Energy
Wind turbine tower base grouting, engineered for the continuous dynamic and vibratory loading a turbine foundation experiences over its operating life.
Railways & Metro Infrastructure
Rail track panel grouting and anchor bolt fixing for fastenings subjected to repetitive dynamic traffic loads.
Industrial Manufacturing
Baseplate grouting for pumps, motors, gearboxes and precision machine beds in factories, where unplanned regrouting downtime is expensive.
Frequently asked questions
How is MC-DUR Grout LE different from an ordinary cementitious non-shrink grout?
What’s the maximum thickness I can pour in one go?
How soon can the machine be started after grouting?
Can this be poured outdoors during Delhi summers?
Does it need special shuttering?
Will Space Arc just supply the material, or can you apply it too?
How we position MC-Bauchemie MC-DUR Grout LE
MC-DUR Grout LE sits at the high-performance end of MC-Bauchemie’s grouting range, engineered specifically for the low-exotherm, dynamic-load segment rather than general baseplate work — for lighter or non-dynamic applications, the broader MC-DUR mortar range or a standard cementitious non-shrink grout is often the more economical MC-Bauchemie choice, and MC-DUR Grout LE-10 covers projects needing a different flow or pour profile within the same low-exotherm epoxy family. Where a specifier is comparing brands, the closest genuine equivalent is Fosroc’s Conbextra EP10, a solvent-free two-component epoxy grout built for similar precision-baseplate and structural-crack-injection work — a specifier already standardised on Fosroc systems, or working to a vendor list that calls for Conbextra-family products, would reasonably choose that route instead. Space Arc carries both brands and can advise on which fits a given foundation’s load, depth and site-temperature profile.
Fosroc Conbextra EP10 — A specifier already standardised on Fosroc systems, or whose approved vendor list calls for Conbextra-family grouts, might choose Conbextra EP10 for the same precision baseplate and dynamic-load grouting role.
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