About Fosroc Lokfix EP

Fosroc Lokfix EP is a thixotropic, high-strength epoxy resin anchoring grout designed for situations where a chemical fixing must outperform a conventional cementitious grout or a mechanical expansion anchor. Supplied as two pre-weighed components — an epoxy resin base and a curing agent — it is combined on site at a 2:1 ratio by weight (roughly 2.3:1 by volume) to produce a concrete-grey, paste-like putty that holds its shape on vertical and overhead faces without slumping. That thixotropy is the practical heart of the product: a fixer can pack an overhead dowel hole or butter the back of a base plate and the material stays put while it gels.

Unlike expansion-type anchors, Lokfix EP develops its holding capacity through chemical adhesion and mechanical interlock with the roughened hole wall, so it generates no bursting force on the surrounding concrete. This lets engineers place anchors near free edges, in thin sections, and at close centres — geometry that would risk cracking with a torque-set expansion bolt. The epoxy chemistry also gives Lokfix EP three traits that matter on Indian sites: it cures without shrinkage, it bonds to damp surfaces, and it will set even when fully immersed in water, making it suitable for repair and anchoring work in water-retaining structures, basements and tidal or splash zones.

Beyond pure anchoring, Lokfix EP is positioned by Fosroc as a general-purpose, fast-setting epoxy for rapid repair, bonding and mortar work — patching spalled concrete, bedding precast units, fixing fractured nosings, and similar quick-turnaround tasks where a cement mortar would be too slow or too weak. It is part of Fosroc’s wider Lokfix anchoring family, which also includes polyester resins (Lokfix S, Lokfix P) and pure-epoxy cartridge systems (the Lokfix E-series such as E55 and E77) for engineered, calculation-based anchor design. Space Arc Engineering supplies and applies Lokfix EP alongside that full range across Delhi NCR and Pan-India.

The technical insight

The defining technical decision behind Lokfix EP is the use of a thixotropic, solvent-free epoxy rather than a polyester or a cementitious grout. Epoxy resins bond to concrete and steel through covalent and polar adhesion rather than the friction-and-confinement mechanism of expansion anchors, which is why Lokfix EP can deliver pull-out capacity with zero expansion force and tolerate small edge distances. The trade-off epoxy makes versus polyester is slower gel time in exchange for higher ultimate bond strength, better creep resistance under sustained load, and near-zero cure shrinkage — important when an anchor must carry tension for decades. Because it is moisture-tolerant and cures under water, the resin system also resists the bond-line failure that plagues many adhesives on damp Indian substrates during the monsoon. As with all epoxies, performance is temperature-sensitive: at higher ambient temperatures the pot life shortens and strength gains faster, while in cool conditions the fixer must allow a longer cure before applying load. The single most common cause of a failed epoxy anchor is not the resin but the hole — dust, slurry or standing water left in the bore prevents the resin from keying into sound concrete, so brush-and-blow cleaning is non-negotiable.

Where it is used

• Fixing reinforcement starter bars and dowels into hardened concrete for extensions, slab connections and construction joints
• Setting holding-down bolts, base-plate bolts and machine foundation anchors
• Installing safety barriers, crash barriers, handrails, fencing and bollards into concrete or masonry
• Anchoring into damp or water-saturated concrete, including basements, water tanks and marine splash zones
• General fast-set structural repair — patching spalls, blowholes and damaged arrises
• Bonding precast and prefabricated concrete elements
• Sealing and filling cracks and as an epoxy mortar for small-area reinstatement

Key advantages

• Anchors without expansion forces, so it can be used at small edge distances and close anchor spacings without splitting the concrete
• Thixotropic putty consistency holds in horizontal, vertical and overhead holes without sag or run-out
• Sets even when immersed in water and bonds to damp substrates — workable through the monsoon and in wet structures
• Cures without shrinkage, maintaining intimate contact with the bar and hole wall
• High compressive, tensile and flexural strength with strong adhesion to concrete and steel
• Pre-weighed two-part packs give a consistent, simple on-site mix with extended working time
• Good chemical resistance and corrosion protection to the embedded steel

Limitations & considerations

• Cure rate and pot life are temperature-dependent — working time shortens in heat and strength gain slows in cold conditions
• Hole preparation is critical; dust, slurry or loose material drastically reduces pull-out capacity
• Like all epoxies it has a finite shelf life and a defined service-temperature ceiling above which strength is reduced
• Mix ratio must be followed accurately (2:1 by weight) and components thoroughly blended, or cure and strength suffer
• Not a substitute for an engineered anchor design — for safety-critical or seismic fixings, capacities must be confirmed against the project TDS and load tables
• Higher material cost than polyester resins or cementitious grouts, so best reserved for where epoxy performance is genuinely required

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Lokfix EP

Within Fosroc’s grouts-and-anchors range, Lokfix EP sits as the versatile, hand-applied epoxy option — more capable than the polyester Lokfix S and Lokfix P where moisture tolerance, creep resistance and chemical durability matter, but simpler and more general-purpose than the engineered Lokfix E55 / E77 cartridge systems used for calculation-based, high-capacity anchor design. For flowable, large-volume base-plate and machine grouting it pairs naturally with Fosroc’s Conbextra epoxy grouts (such as Conbextra EP10), while structural bonding and rebar-strengthening jobs often bring in Nitobond epoxy and the Nitofix anchoring chemistry. Against the wider market, credible alternatives an Indian engineer may compare include Sika’s AnchorFix and Sikadur epoxy anchoring resins, MBS (formerly BASF Master Builders) MasterFlow and concresive epoxy systems, Dr. Fixit’s anchoring and epoxy grout line, and STP/Pidilite construction-chemical equivalents. The honest position: Lokfix EP is an excellent, field-proven choice for damp-condition anchoring, fast repair and edge-sensitive fixings, but for safety-critical or seismic anchors the specific embedment, capacity and standards data should always be confirmed against the current Fosroc TDS — and Space Arc Engineering can supply that documentation and recommend the right product across the Lokfix, Conbextra and Nitobond families.

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