MC-Bauchemie MC-Solid 1280
Thixotropic structural epoxy for bonding precast segments, vertical joints and old-to-new concrete — built for India’s metro, flyover and industrial-precast work.
What is it?
A two-component, solvent-free, moisture-insensitive thixotropic epoxy adhesive used to bond precast concrete segments and structural joints without shrinkage.
Where is it used?
Precast segmental bridges, metro viaducts and flyovers, vertical and overhead structural bonding, tie-rod and dowel-hole filling, and old-to-new concrete construction joints.
Why use it?
Delivers high early bond and compressive strength, tolerates damp substrates, and stays put on vertical and overhead faces without sagging or shrinking during cure.
How is it applied?
Mix Resin and Hardener 2:1 by weight with a slow-speed drill and paddle for 2-3 minutes, then trowel or spread onto prepared, sound concrete within the pot life before jointing.
About MC-Bauchemie MC-Solid 1280
MC-Solid 1280 is MC-Bauchemie’s thixotropic, solvent-free epoxy adhesive built for one job in particular: bonding precast concrete segments into a water-tight, structurally continuous joint. It is a two-pack resin-and-hardener system, mixed 2:1 by weight, that trowels onto prepared segment faces, resists slump on vertical and overhead surfaces, and cures to a high-modulus, virtually shrinkage-free bond line. Where an ordinary construction adhesive would run or sag on a soffit or a near-vertical segment face, MC-Solid 1280’s thixotropy keeps it exactly where it is spread, which is what makes it usable in the awkward geometries that segmental bridge and tunnel construction throws up.
In the Indian market this product shows up wherever precast segmental construction is happening — elevated metro corridors, flyover widening, and highway viaducts built by span-by-span or balanced-cantilever erection, all of which depend on epoxy-glued match-cast joints between segments. It is equally at home off the bridge deck: filling tie-rod and dowel holes, bonding new concrete to old at construction joints, or gluing precast panels and copings on industrial and building sites. Space Arc Engineering supplies MC-Solid 1280 pan-India as an authorised MC-Bauchemie distributor and applicator, and can support specification, batch planning and on-site mixing supervision for segmental and structural bonding packages.
The technical insight
The number worth reading on MC-Solid 1280’s data sheet is the tensile E-modulus — 1500 N/mm² at 7 days per ISO 527. That stiffness, combined with a specific gravity of 1.90 kg/L and thixotropic, non-sag rheology, is what lets the epoxy act as a load-transferring shim between precast segments rather than just a glue line: once cured, the joint behaves close to a rigid extension of the concrete on either side, which is exactly what balanced-cantilever and span-by-span segmental erection methods need at the epoxy interface. The over-60 N/mm² compressive strength at just 1 day is equally telling — it means a stressing or jacking sequence on a segmental bridge does not have to wait for a conventional 7- or 28-day concrete cure, which is often the real programme driver on elevated-corridor projects. The trade-off is that all of this performance is mixing-ratio dependent: at 2:1 resin-to-hardener by weight, any deviation from that ratio — a common site shortcut when a pack is only partly used — shows up later as reduced strength or incomplete cure, by which point the segment is already stressed and the joint is hidden.
Where it is used
- Epoxy bonding of precast segmental box-girders in bridges, flyovers and metro viaducts
- Segment-to-segment jointing in match-cast precast construction (span-by-span and balanced-cantilever erection)
- Structural bonding on vertical or overhead faces between concrete, steel, stone, iron and timber
- Bonding new concrete pours to existing hardened concrete at construction and cold joints
- Filling and bonding tie-rod holes and dowel pockets in precast elements
- Repair of spalled corners, arrises and joint edges on RCC/PCC structures
- Levelling and packing vertical and overhead structural surfaces before jointing
- Water-tight structural sealing at precast joints exposed to moisture ingress
Key advantages
- Solvent-free and moisture-insensitive, so it can be applied on slightly damp substrates without losing bond quality
- Thixotropic consistency stays put on vertical and overhead surfaces without slumping or running
- High early strength — over 60 N/mm² compressive at just 1 day, useful when stressing sequences are schedule-critical
- Virtually shrinkage-free curing keeps segmental joints dimensionally stable under load
- High tensile E-modulus (1500 N/mm²) gives a stiff, load-transferring joint rather than a soft glue line
- Tested to FIP recommendations plus ASTM C-579, ASTM C 882, DIN EN 196 and ISO 527 — the standards bridge and metro consultants usually specify
- Straightforward 2:1 resin:hardener ratio with a workable pot life of over 40 minutes at 30°C
- Backed by Space Arc’s pan-India supply and on-site application support across Delhi NCR
Limitations & considerations
- Not a floor topping or wearing coating — it is a structural bonding adhesive, not a substitute for MC-Floor or MC-DUR flooring systems
- Pot life is strongly temperature-sensitive; hot Indian summer site conditions can shorten working time well below the 30°C-rated figure
- Requires slow-speed machine mixing for segment-bonding use — hand mixing is not recommended and can leave the ratio uneven
- Minimum substrate compressive strength (25 N/mm²) and pull-off strength (1.5 N/mm²) must be verified before application, adding a testing step to the programme
- Supplied only in 6 kg two-component packs, so large segmental jobs need careful batch planning and consistency checks across packs
- Like all epoxies, performance depends entirely on accurate 2:1 mixing and full amalgamation — under-mixing is a common and costly site error
Selection & best practice
Confirm substrate readiness before opening the pack: MC-Bauchemie’s data sheet calls for a minimum concrete compressive strength of 25 N/mm² and a pull-off strength of 1.5 N/mm² on the bonding face, so a pull-off test is worth the half-hour it takes on a segmental job. Surfaces must be free of dust, laitance, loose material, contamination and curing-compound residue — grit-blast or scabble precast faces rather than relying on a water wash. Always machine-mix with a slow-speed drill and paddle for 2-3 minutes and pour the mix between containers to fully homogenise resin and hardener; hand mixing is explicitly not recommended for segment-bonding duty. Because pot life roughly halves for every 10°C rise in ambient temperature, plan batch sizes and the jointing sequence around site temperature — a summer afternoon pour in Delhi NCR needs smaller batches and a faster crew than a cool early-morning application. Clean tools with MC-Reinigungsmittel U before the epoxy sets; once hardened, residue can only be removed mechanically.
Specifications
| Chemistry / Type | Two-component, solvent-free, moisture-insensitive thixotropic epoxy adhesive |
| Specific Gravity | 1.90 ± 0.05 kg/L at 30°C |
| Mixing Ratio | 2:1 by weight (Resin : Hardener) |
| Pot Life | >40 minutes (100 g mass at 30°C) |
| Compressive Strength | >60 N/mm² at 1 day, >75 N/mm² at 7 days (ASTM C-579) |
| Bond Strength | >10 N/mm² on concrete at 7 days (ASTM C 882) |
| Flexural Strength | >25 N/mm² at 7 days (DIN EN 196) |
| Tensile Strength / E-Modulus | >10 N/mm² tensile strength; 1500 N/mm² tensile E-modulus at 7 days (ISO 527) |
| Coverage / Pack Size | 1.63 m²/pack at 2 mm thickness; 6 kg two-component pack |
Industry use cases
Metro rail & elevated corridors
Epoxy bonding of precast segmental box-girders during launching and erection of viaduct spans on metro extension works.
Highway flyovers & bridges
Segment-to-segment epoxy jointing for balanced-cantilever and span-by-span precast bridge construction.
Industrial & precast yards
Bonding precast panels, coping stones and vertical elements where a rigid, shrinkage-free structural joint is required.
Structural repair & retrofit
Filling tie-rod and dowel holes and repairing spalled corners and joint edges on existing RCC structures.
General building construction
Bonding new concrete pours to existing hardened concrete at construction joints and cold joints on site.
Frequently asked questions
Is MC-Solid 1280 a floor coating?
Can it be applied on damp concrete?
How much working time do I get once it’s mixed?
What pack size does it come in?
What standards does it meet?
Does Space Arc supply and apply it, or just supply the material?
How we position MC-Bauchemie MC-Solid 1280
MC-Solid 1280 sits inside MC-Bauchemie’s specialist epoxy-bonding family alongside MC-Solid 1200 (a general-purpose universal epoxy bonding agent for repair overlays) and MC-Solid 1331 BM (a dedicated segment adhesive for precast bridge construction) — 1280 is the thixotropic grade contractors reach for on vertical and overhead structural bonding specifically. On the same structure it typically pairs with Nafufill repair mortars for spalled concrete and MC-Injekt resins for crack and joint injection, so specifiers rarely buy it in isolation. Where a project only needs a general-purpose epoxy bonding agent for concrete-to-concrete repair rather than the FIP/ASTM-rated segmental-jointing performance of MC-Solid 1280, Fosroc’s Nitobond EP is a credible, widely specified Indian-market alternative, and Sika’s Sikadur epoxy range is the other name consultants commonly shortlist for precast segmental adhesive work. Space Arc stocks and applies both MC-Bauchemie and Fosroc lines, so the practical choice usually comes down to the consultant’s approved-brand list and the exact strength/standard callouts on the structural drawing.
Fosroc Nitobond EP — Specifiers reach for Nitobond EP when the drawing calls for a general-purpose epoxy bonding agent for concrete-to-concrete repair rather than the FIP/ASTM-rated segmental jointing performance MC-Solid 1280 is specifically tested and thixotroped for.
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