Fosroc Lokfix E77
Pure epoxy 3:1 cartridge system for high-load rebar and threaded-rod anchoring in cracked, dry, wet or flooded concrete.
What is it?
A two-component, pure epoxy chemical anchoring resin supplied in a 3:1 side-by-side cartridge with a static mixer nozzle, used to bond rebar and steel fixings into concrete and solid masonry.
Where is it used?
Post-installed rebar starter bars, threaded-rod fixings, base-plate and holding-down bolts, and dowels on building extensions, industrial plants, bridges and infrastructure across Delhi NCR and Pan-India.
Why use it?
It delivers very high characteristic bond strength with no expansion force on the substrate, so fixings can sit closer to edges and to each other, and it is accredited for cracked concrete plus C1/C2 seismic and up to 2-hour fire performance.
How is it applied?
Drill and thoroughly clean the hole, load the cartridge into a 3:1 gun, pre-extrude until the mix runs uniform red, inject from the back of the hole two-thirds to three-quarters full, then twist the fixing home before gel time elapses.
About Fosroc Lokfix E77
Lokfix E77 is Fosroc’s flagship pure-epoxy chemical anchor and the successor to the long-serving Lokfix E75. It arrives as a two-component resin in a 3:1 side-by-side cartridge fitted with a static mixing nozzle, so the two parts blend automatically as they pass through the tip. Once dispensed into a prepared hole, it cures to grip rebar, threaded rod, dowels and bolts firmly inside concrete and solid masonry. Unlike a mechanical expansion anchor, it holds through chemical adhesion rather than wedging force, which is what lets designers place fixings close to slab edges and in thin sections without risking a split-out.
For engineers and contractors working across Delhi NCR and the rest of India, the appeal is that this is a fully engineered, accredited anchor rather than a general-purpose adhesive. It is accredited for use in dry, wet and flooded holes, works in cracked as well as uncracked concrete, and carries European approvals that back post-installed rebar connections and anchoring into cracked concrete, along with C1 and C2 seismic and fire testing. Fosroc also publishes free design software at lokfix.com so specifiers can size embedment, edge distance and loads to EN 1992-4. As an authorised Fosroc distributor and applicator, Space Arc supplies the genuine E77 system together with the correct 3:1 dispensing gun, mixer nozzles, brushes and extension accessories needed to install it properly on site.
The technical insight
The load capacity of any bonded anchor comes from the shear transfer across three interfaces: rebar-to-resin, resin body, and resin-to-concrete. Lokfix E77 is a pure epoxy chemistry rather than a polyester or vinylester, which gives it a stiff, high-strength cured matrix (compressive strength above 110 MPa, E-modulus over 6000 MPa) and excellent adhesion to the borehole wall. Because the resin bonds chemically and does not expand, it introduces no bursting stress into the surrounding concrete, so the failure mode shifts away from concrete splitting and toward the full bond capacity of the system. Correct borehole cleaning is decisive here: dust acts as a bond-breaker, so the specified blow-brush-blow cycle is what allows the epoxy to key into the roughened concrete and reach its rated pull-out values. The extended gel time (30 minutes at 20 C) gives crews a realistic working window to seat deep or multiple fixings, while the resin remains watertight after cure, sealing the embedded steel against corrosion.
Where it is used
- Post-installed reinforcement starter bars and dowels for slab, wall and column extensions
- Anchoring threaded rod and internal threaded-rod sleeves for structural steel connections
- Holding-down bolts and base plates for machinery, columns and equipment skids
- Shear-connector dowels tying new concrete to existing structures
- Fixing safety barriers, crash barriers, handrails and fencing into concrete
- Anchoring into cracked and uncracked concrete in seismic zones (C1/C2)
- Fixings in damp, wet or fully flooded holes such as basements, tanks and marine works
- Overhead and vertical anchoring where slump control and high bond are required
Key advantages
- Very high characteristic bond strength for heavy fixings or more economical anchor layouts
- Pure epoxy exerts no expansion force, so fixings can sit closer to edges and to each other
- Accredited for dry, wet and flooded holes, plus cracked concrete
- C1 and C2 seismic performance and fire testing to 120 minutes for threaded rod
- Extended gel time (30 min at 20 C) suits deep holes and complex, multi-fixing procedures
- Watertight cured resin protects embedded steel from corrosion and water ingress
- Low VOC, LEED-compliant VOC level and French A+ indoor-air emissions rating
- Re-usable cartridge (swap the cap and nozzle) reduces waste over the 24-month shelf life
Limitations & considerations
- Requires a dedicated 3:1 application gun; standard 1:1 sealant guns will not dispense it
- Borehole must be rigorously cleaned (blow-brush-blow); leftover dust sharply reduces bond
- Not recommended for installation when substrate temperature is at or below the low end of its range without slower cure allowances, and cure time roughly doubles in wet or damp conditions
- May stain natural or decorative stone, so suitability must be checked before such use
- All load, seismic and fire design must be carried out by a qualified engineer using the relevant EAD/ETA and Fosroc software
- Diamond-drilled holes need extra flushing and wire-brushing before the standard cleaning cycle
Selection & best practice
Match the drill and cleaning-brush diameter to the fixing using Fosroc’s setting tables, then clean relentlessly: blow the hole out twice with compressed air, wire-brush twice with a brush at least 0.5 mm larger than the hole, and blow twice more, repeating until no dust remains. Remove any standing water before you start. Pre-extrude the first two or three squeezes and discard the streaky material until the mix runs a consistent red. Inject from the back of the hole, pulling the nozzle back as you fill to two-thirds or three-quarters, using an extension nozzle beyond 190 mm embedment and a piston plug for holes over 18 mm diameter or overhead work. Insert the fixing with a gentle twist before gel time expires, hold it straight until set, and do not apply load or final torque until the full cure time for the site temperature has passed. Store cartridges dry at +5 to +35 C and let them warm toward +40 C just before application in cold weather.
Specifications
| Product type | Two-component pure epoxy chemical anchor, 3:1 cartridge system |
| Mixing ratio | 3:1 (resin:hardener), auto-mixed through static nozzle |
| Pack sizes | 440 ml cartridges (box of 12) and 585 ml cartridges |
| Compressive strength (EN 196-1) | >110 MPa |
| Flexural strength (EN 196-1) | >60 MPa |
| E-modulus (ISO 527-2) | >6000 MPa |
| Density | ~1.5 kg/L |
| Gel / cure time | 30 min gel and 12 h cure at +20 C (cure doubles in wet/damp holes) |
| Standards & approvals | EAD 330087-00-0601 & EAD 330499-01-0601; C1/C2 seismic; fire to 120 min (threaded rod); 24-month shelf life |
Industry use cases
Building extensions & remodelling
Doweling new columns, slabs and walls into existing RCC with post-installed rebar that develops full bar capacity without splitting edges.
Industrial & power plants
Setting holding-down bolts and base plates for machinery, structural steel and equipment skids where high pull-out and vibration resistance matter.
Bridges & infrastructure
Anchoring in cracked and uncracked concrete under seismic C1/C2 conditions, with a watertight bond that protects embedded steel long-term.
Basements, tanks & marine
Reliable anchoring in damp, wet or flooded holes for water-retaining and below-ground structures common in Indian monsoon conditions.
Fabrication & safety systems
Fixing crash barriers, handrails, cladding brackets and MEP supports close to slab edges where mechanical anchors would risk cracking.
Frequently asked questions
What is the mixing ratio and do I need a special gun for Lokfix E77?
Can Lokfix E77 be used in wet or water-filled holes?
Is it approved for cracked concrete and seismic use?
How much product will one hole consume?
What are the gel and cure times?
What is the shelf life and how should it be stored?
How we position Fosroc Lokfix E77
Lokfix E77 is the premium, fully accredited choice in Fosroc’s anchoring range when you need engineered pull-out, cracked-concrete and seismic performance from a pure epoxy. Where the job is lighter or you want a faster set, Fosroc’s own Lokfix E35 (styrene-free polyester) and Lokfix E55/E45 (vinylester) cartridge systems are the logical step down, and Lokfix E45T is worth naming when quicker gelling is the priority. For thixotropic epoxy grouting of larger bars and pockets, Lokfix EP is the complementary Fosroc product. For structural bedding and machine grouting beyond chemical anchoring, pair with Fosroc’s Conbextra cementitious and epoxy grout range. Where a project also carries repair or waterproofing scope, Space Arc can supply matched systems from our other principals including Sika and Dr. Fixit, so the anchoring, repair mortar and waterproofing all come from one authorised source.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.