Sika Hibond
A two-part epoxy bonding agent that creates a permanent structural bond between hardened concrete and freshly placed concrete, screeds or repair mortars.
What is it?
A solvent-free, two-component epoxy resin bonding agent from Sika that bridges old, cured concrete and newly cast concrete or mortar so the two behave as one monolithic member.
Where is it used?
At construction joints and repair interfaces — slab extensions, column and beam jacketing, water tank and retaining wall casting, balcony extensions and structural repair patches.
Why use it?
A cold joint is a plane of weakness. Hibond replaces that weak interface with a high-strength epoxy film so shear and tension transfer across the joint instead of stopping at it.
How is it applied?
Mix Part A and Part B in the supplied ratio, brush a continuous coat onto the prepared substrate, then place the new concrete or mortar while the epoxy is still tacky and within its working window.
About Sika Hibond
Sika Hibond is the answer to a problem every site engineer knows: fresh concrete does not naturally grip concrete that has already set. Left to a simple wetted joint, the two pours meet at a cold interface that carries almost no tension and only modest shear, and under load that plane is where cracking and delamination begin. Hibond is a two-component epoxy resin adhesive that is brushed onto the hardened face just before the new pour. It cures into a rigid, high-strength film that keys into both surfaces, turning what would have been a construction joint into a continuous, load-sharing connection. Because it is epoxy rather than a cement slurry, the bond strength it develops comfortably exceeds the tensile strength of the surrounding concrete, so failure, when forced, occurs in the parent concrete rather than at the glue line.
The product is supplied as a pre-weighed 600 g kit — Part A, a white resin (400 g), and Part B, a darker brown hardener (200 g) — that are combined on site. It is formulated for Indian conditions, tolerating warm substrates and slightly damp surfaces, and it carries a deliberately generous open time so a crew has room to position, screed and compact the new material without the adhesive skinning over first. Hibond meets ASTM C881 Type II, Grade 2, Class B and C, the recognised benchmark for epoxy bonding systems, and is routinely specified on slab extensions, tank and retaining-wall casting, column and beam jacketing, and structural repairs where the new-to-old bond is doing real structural work rather than cosmetic filling.
The technical insight
The mechanism is straightforward but the numbers explain why specifiers reach for epoxy over a cementitious primer. When two concrete pours meet with only a wet interface, the bond relies on cement paste re-knitting across the joint — a bond of perhaps 1 to 1.5 MPa in tension, and one that is easily compromised by dust, laitance or premature drying. Hibond instead lays down a continuous epoxy film that mechanically interlocks with the open pore structure of both faces and chemically wets the aggregate. The cured adhesive develops compressive strength above 55 MPa at 7 days, tensile strength around 18–20 MPa and shear strength above 10 MPa at 14 days (all at 30°C), so the joint is stronger than the concrete on either side of it. The practical consequence is that the interface stops being the weak link. Load, shrinkage restraint and thermal movement transfer smoothly across the joint, and the composite section behaves monolithically — which is exactly what a jacketed column or a bonded overlay needs to actually add capacity rather than just add thickness.
Where it is used
- Bonding new concrete to hardened concrete at construction and day joints
- Concrete jacketing of columns and beams for strengthening or repair
- Casting of water tanks, sumps and retaining walls against previously cast sections
- Extending existing slabs, balconies and cantilevers
- Priming substrates ahead of thick-section repair mortars and micro-concrete
- Bonding screeds and toppings to structural slabs where a structural bond is required
- Interface treatment on precast connection joints and stitch pours
- Repair of spalled or cut-out concrete where new material must key into sound parent concrete
Key advantages
- Epoxy bond strength that exceeds the tensile strength of the surrounding concrete, so the joint is no longer the weak point
- Complies with ASTM C881-87 Type II, Grade 2, Class B and C
- Long pot life and open time — roughly a 4-hour working window after mixing to place the new material
- Tolerates warm substrates and slightly damp surfaces, suiting Indian site conditions
- Solvent-free, high-build epoxy that brushes on without specialist equipment
- Pre-weighed 600 g kit removes on-site ratio errors
- High compressive, tensile and shear performance for genuinely structural connections
- Compatible with Sika repair mortars and micro-concretes for a single-source repair system
Limitations & considerations
- It is an interface adhesive, not a repair mortar — it bonds but does not fill voids or rebuild section
- The new concrete or mortar must be placed while the film is still tacky; if the epoxy is allowed to fully cure first, bond is lost and the coat must be reapplied
- Working time shortens in hot weather, so batch sizes should match the crew’s placing speed
- Being epoxy, it is a higher unit cost than a cementitious slurry primer and is best reserved for structural joints rather than non-structural bedding
- Substrate must be sound, clean and free of laitance, oil and loose material — surface preparation governs the result
- Not intended as a moisture barrier or a standalone wearing/protective coating
Selection & best practice
Preparation decides the outcome. Cut back to sound concrete, remove all laitance, dust, oil and curing-compound residue by grit-blasting, scabbling or mechanical wire-brushing, and expose a rough, open profile. The surface should be clean and either dry or no more than slightly damp — never with standing water. Combine the full Part A and Part B kit and mix thoroughly until uniform in colour; do not split the pack by eye, as the ratio is set by the packaging. Brush a continuous, well-worked coat into the prepared face, driving the epoxy into pores and around any exposed reinforcement, and leave no missed patches. Then place the new concrete, mortar or micro-concrete while the Hibond is still wet and tacky and comfortably within its working window — this is the single most important step, because bond depends on the two materials joining before the epoxy sets. In hot conditions, mix smaller batches so the crew never outruns the open time, and clean tools with Sika Colma Cleaner before the resin hardens. Cure the newly placed repair material by normal good practice.
Specifications
| Type | Two-component, solvent-free epoxy resin bonding agent |
| Standard | ASTM C881-87 Type II, Grade 2, Class B & C |
| Components | Part A resin (white, 400 g) + Part B hardener (brown, 200 g) |
| Pack size | 600 g kit |
| Mixed density | 1.68 kg/l at 30°C |
| Consumption | 0.200–0.500 kg/m² (approx. 12–30 sq ft per 600 g pack), depending on substrate roughness and porosity |
| Working / open time | Approx. 4 hours after mixing at ambient temperature |
| Compressive strength | >55 MPa (7 days at 30°C) |
| Tensile strength | ~18–20 MPa (14 days at 30°C) |
| Shelf life | 12 months in original sealed packaging, stored dry at +5°C to +40°C |
Industry use cases
Structural Strengthening
On column and beam jacketing, Hibond primes the old member so the new concrete jacket bonds and shares load, rather than sitting as a loose collar that adds thickness without capacity.
Water-Retaining Structures
For casting tanks, sumps and retaining walls against earlier lifts, it welds successive pours together and removes the cold joint that would otherwise be a seepage and weakness plane.
Building Repair & Extension
Contractors extending slabs, balconies and cantilevers use it to tie new concrete into the existing structure so the extension acts as part of the original member.
Concrete Repair
Ahead of Sika repair mortars and micro-concrete in cut-out or spalled repairs, it keys the new material into sound parent concrete and helps prevent later delamination of the patch.
Infrastructure & Overlays
On bonded overlays and stitch pours, it provides the structural interface bond needed for the topping and substrate to behave compositely under traffic and thermal movement.
Frequently asked questions
Is Sika Hibond an epoxy or a cement-based bonding slurry?
How long do I have to place the new concrete after brushing it on?
Can I apply it on a damp surface?
How much area does one 600 g pack cover?
What is the pack configuration and shelf life?
Which Sika repair materials work with it?
How we position Sika Hibond
Sika Hibond sits at the epoxy end of the bonding-agent range and is the right choice when the new-to-old joint is doing structural work — jacketing, tank walls, slab extensions and load-bearing repairs. Where the bond is non-structural, an acrylic/SBR bonding agent is more economical and easier to use; for corrosion protection plus bonding of reinforcement in a repair, Sika’s cementitious Armatec-type primers are the natural companion. Within the same Sika family, pair Hibond with SikaTop and Sika MonoTop repair mortars or micro-concrete for a fully compatible repair system, and keep Sika Colma Cleaner on hand for tool cleaning. Across the brands we carry, comparable epoxy bonding agents include Fosroc Nitobond EP, MC-Bauchemie and Dr. Fixit interface products — useful where a project specification names a particular brand.
Fosroc Nitobond EP — Choose Nitobond EP when the project specification calls for Fosroc, or when you want a single Fosroc-branded system alongside Renderoc repair mortars — it is the directly equivalent two-component, solvent-free epoxy bonding agent.
Related Concrete Repair products
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