Fosroc Conbextra EPG
High-strength, chemically resistant three-component epoxy resin grout for heavy-duty baseplate and machinery grouting from 10 mm to 120 mm.
What is it?
A three-component, solvent-free epoxy resin grout (base resin, liquid hardener and specially graded filler) supplied in pre-weighed packs for whole-pack site mixing.
Where is it used?
Grouting of baseplates, anchor bolts and machinery beds in gaps from 10 mm to 120 mm, especially where dynamic loads or chemical spillage are present.
Why use it?
Delivers ~90 N/mm2 compressive strength at 7 days, high flexural and tensile strength, and resistance to acids, alkalis, water and frost – well beyond cementitious grouts.
How is it applied?
Mix the complete pack on site, then pour or pump into the prepared gap in a continuous flow from one side to avoid air entrapment. No water added.
About Fosroc Conbextra EPG
Fosroc Conbextra EPG is a high-performance epoxy resin grout engineered for the demanding end of structural grouting – the situations where a normal cementitious grout simply will not survive. It is a three-component system: an epoxy base resin, a liquid hardener and a charge of specially graded inert aggregate, all supplied in the correct mix proportions so that the contractor mixes the entire pack on site without adding water or any other material. Once cured, it forms a dense, void-free, dimensionally stable solid that transfers heavy and dynamic loads from a baseplate into the foundation. Conbextra EPG is formulated to fill comparatively wide gaps, from 10 mm up to 120 mm in a single pour, which sets it apart from the thin-section epoxy grouts such as Conbextra EP10 that are intended for gaps below 10 mm. For Indian contractors, consultants and plant engineers, the practical appeal is twofold. First, the cured grout reaches roughly 90 N/mm2 compressive strength at 7 days with high flexural and tensile strength, so it carries vibrating and reciprocating machinery without cracking or pumping out. Second, it withstands attack from a broad range of chemicals, acids and alkalis as well as water and frost, which makes it the natural choice for refineries, fertiliser plants, steel mills and effluent areas where spillage on the grout shoulder is routine. The product conforms to the relevant requirements of EN 1504-6 for the anchoring of steel reinforcing bar, placing it in the same European harmonised framework that governs the wider Conbextra epoxy range. Space Arc Engineering, an authorised Fosroc distributor and applicator operating across Delhi NCR and Pan-India, supplies Conbextra EPG together with on-site application guidance so that the grout performs to its datasheet rather than to the weather on pour day.
The technical insight
The defining technical behaviour of Conbextra EPG is its load-spreading stiffness combined with low effective shrinkage. Because it is a filled epoxy rather than a cement, it does not rely on gas-expansion or iron-oxidation chemistry to compensate for plastic settlement; the resin cures with negligible volume change and bonds intimately to both the steel baseplate above and the prepared concrete below. That continuous bond, plus high flexural strength (in excess of 30 MPa at 7 days), is what lets it survive the cyclic, vibrating loads of rotating machinery where a brittle or weakly bonded grout would fatigue and debond. Two parameters dominate the field result. The first is temperature: epoxy grouts are exothermic and temperature-sensitive, so pot life shortens sharply as ambient temperature rises – a pour that is comfortable at 20 C can become unworkable by 35-40 C, which is the reality on most Indian sites from March to September. The graded filler must therefore be added and the whole pack placed quickly and continuously. The second is the fresh density of roughly 2.08 kg/l, which is far heavier than a cement grout and makes accurate volume estimation and a single uninterrupted pour important – cold joints in epoxy grout are weak planes. Properly placed, the cured grout is effectively impermeable, which is why it doubles as a chemical barrier on the grout shoulder in aggressive plant environments.
Where it is used
- Grouting of baseplates and soleplates under reciprocating and rotating machinery subject to dynamic and vibrating loads
- Anchoring of holding-down bolts and starter bars where high pull-out resistance is required (EN 1504-6 anchoring)
- Bedding of crane rails, transporter rails and high-speed turbine and compressor bases
- Grouting in chemically aggressive zones – refineries, fertiliser and chemical plants, steelworks and effluent treatment areas
- Filling of wider gaps from 10 mm up to 120 mm in a single continuous pour
- Repair and re-grouting of machine foundations where the original cementitious grout has failed under load or chemical attack
Key advantages
- High compressive strength of approximately 90 N/mm2 at 7 days for heavy load transfer
- High flexural and tensile strength (flexural >30 MPa at 7 days) gives excellent performance under dynamic and impact loading
- Broad chemical resistance to acids, alkalis, water and frost suits aggressive industrial environments
- Pre-weighed three-component pack removes site batching errors – no water or additional materials needed
- Handles wide gaps from 10 mm to 120 mm in one pour, unlike thin-section epoxy grouts
- Free-flowing, low-shrinkage placement gives full, void-free contact under the baseplate for uniform load bearing
- Conforms to EN 1504-6 for steel anchoring, supporting specification on regulated projects
Limitations & considerations
- Significantly more expensive than cementitious grouts such as Conbextra GP – reserve epoxy grout for genuinely demanding load or chemical duties
- Pot life is short and falls rapidly as temperature rises; hot Indian summer pours need careful planning, shading or cooler-hour scheduling
- Exothermic cure means very large single placements may need to be poured in lifts to control heat build-up
- Requires a clean, dry, sound and properly primed substrate – moisture or contamination compromises bond
- Heavy fresh density (~2.08 kg/l) demands accurate volume calculation and a single uninterrupted pour to avoid cold joints
- Strong odour and resin handling mean adequate ventilation, gloves and eye protection are essential during mixing and placing
- Not intended for thin gaps below 10 mm, where a low-viscosity grade such as Conbextra EP10 is the correct choice
Selection & best practice
Plan the pour around temperature. Confirm the gap is between 10 mm and 120 mm and that the concrete is at least 28 days old, sound, clean and dry. Saw-cut or grit-blast the concrete to a roughened, contaminant-free surface and degrease the underside of the baseplate. Build a stiff, leak-tight formwork with a generous head box on one side and a minimum 50-100 mm standoff so the grout can be poured continuously. In summer, schedule the pour for early morning or evening, store the unmixed packs in shade, and have enough labour ready to place the full pack within its pot life. Mix base and hardener first, then add the graded filler and combine to a uniform, lump-free consistency using a slow-speed paddle. Pour from one side only, in a single continuous operation, maintaining a constant hydrostatic head so the grout advances as one front and pushes air ahead of it – never pour from both sides. Do not vibrate aggressively or add solvent to improve flow. Protect the placed grout from rain and direct sun until cured, and break back any sacrificial head once the grout has set. For critical machinery, always confirm the exact pot life and cure schedule for your site temperature with the current Fosroc TDS or with Space Arc Engineering’s technical team before placing.
Specifications
| Product type | Three-component, solvent-free epoxy resin grout (base resin + liquid hardener + graded filler) |
| Gap width range | 10 mm to 120 mm |
| Compressive strength | Approx. 90 N/mm2 at 7 days |
| Flexural strength | >30 MPa at 7 days |
| Fresh (wet) density | Approx. 2.08 kg/l |
| Chemical resistance | Resistant to a wide range of acids, alkalis, water and frost |
| Mixing | Whole-pack site mixing; no water or other materials to be added |
| Standard | Conforms to EN 1504-6 (anchoring of reinforcing steel) |
| Application method | Pour or pump in a single continuous flow from one side |
| Typical uses | Baseplate and machinery grouting under dynamic load; chemically aggressive environments |
Industry use cases
Power and heavy engineering
Bedding turbine, compressor and generator soleplates where high-speed rotation produces continuous dynamic load that would fatigue a cementitious grout.
Refineries and chemical plants
Grouting pump and reciprocating-machinery baseplates in zones with routine acid, alkali and hydrocarbon spillage, where the cured grout doubles as a chemical-resistant shoulder.
Steel and metals
Grouting rolling-mill stands, crane rails and transporter rails subject to impact and vibration in hot, contaminated mill environments.
Fertiliser and process industry
Anchoring holding-down bolts and grouting equipment bases in aggressive ammonia, urea and effluent areas demanding both strength and chemical durability.
Infrastructure and retrofit
Re-grouting failed machine foundations and anchoring starter bars on bridge and plant retrofits where high early load capacity and EN 1504-6 anchoring compliance are required.
Frequently asked questions
What type of grout is Fosroc Conbextra EPG?
What gap widths can Conbextra EPG fill?
How strong is Conbextra EPG and how does it compare to cement grout?
Is Conbextra EPG chemically resistant?
What standards does Conbextra EPG comply with?
How should Conbextra EPG be placed correctly on an Indian site?
How we position Fosroc Conbextra EPG
Within the Fosroc Conbextra family, EPG sits between the thin-section epoxy grades and the cementitious products. For tight gaps under 10 mm choose the low-viscosity Conbextra EP10; for wide, non-aggressive duties the cementitious Conbextra GP is far more economical; and where loads are extreme and chemicals severe, the heavier-duty Conbextra EP120 and EP75 grades (already stocked by Space Arc Engineering) overlap with EPG’s territory. EPG’s niche is wide-gap (10-120 mm), high-strength, chemically resistant epoxy grouting in a convenient pre-proportioned pack. Against the wider Indian market, credible alternatives in the same epoxy-grout class include Sika’s SikaGrout epoxy range and Sikadur anchoring resins, MBS (MYK/MC-Bauchemie) Emcekrete epoxy grouts, Dr. Fixit Pidiproof and Pidicrete grouting solutions from Pidilite, and STP (Shalimar/Choksey) epoxy grouts. These compete on price and local availability; Fosroc’s strength is its long specification track record on Indian power, refinery and steel projects and the depth of its Conbextra documentation. As an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, Space Arc Engineering supplies Conbextra EPG with genuine batch-traceable material and on-site application support, which for critical machinery foundations is usually worth more than a marginal saving on a substitute product.
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