Fosroc Conbextra EP10(M)
Two-part, free-flow epoxy resin grout and injection resin for precision gaps of 0.25-9 mm — thin-clearance base plates, anchor bolts and static crack injection, reaching 60 N/mm2 compressive strength in 7 days.
What is it?
An all-liquid, solvent-free epoxy resin system from Fosroc, supplied as pre-proportioned base and hardener in a 1.5 litre pack for full-pack mixing on site.
Where is it used?
Thin-clearance grouting under machine base plates, anchor bolts, crane and transporter rails, and pressure injection of static structural cracks in concrete and masonry.
Why use it?
Fluid enough to fill gaps as fine as 0.25 mm, tolerant of damp substrates, non-shrink with low creep, and chemically resistant to oils, fuels and mild acids in service.
How is it applied?
Mix the full pack with a slow-speed stirrer, then pour or pump into sealed, leak-proof formwork under a hydrostatic head — or inject under pressure for crack repair.
About Fosroc Conbextra EP10(M)
Conbextra EP10(M) sits at the fine end of Fosroc’s Conbextra grouting range. Where most precision grouts need 10 mm or more of clearance to flow, this is an all-liquid system — just resin base and hardener, no aggregate — with a viscosity low enough to travel through gaps between 0.25 mm and 9 mm and still cure into a dense, high-strength bearing material. The same fluidity makes it a practical injection resin for static and structural cracks in concrete and masonry, which is why maintenance engineers often keep a few packs on hand for both duties.
For Indian plant conditions it solves a specific problem: skid-mounted and precision-aligned equipment is frequently shimmed to clearances too tight for cementitious or filled epoxy grouts. Rather than force a thick grout and risk voids under the plate, EP10(M) flows to full contact, resists the oils and process chemicals typical of machine halls, and carries repetitive dynamic load without creeping. Space Arc supplies it ex-stock in Delhi NCR with pan-India dispatch and applicator support.
The technical insight
The performance comes from what is left out. Because EP10(M) carries no filler, nothing can segregate or bridge inside a sub-millimetre gap, so the resin wets both faces completely and cures by epoxy cross-linking into a rigid, void-free bearing layer — non-shrink because the reaction is addition-cure, with no water to evaporate. The cured matrix gives roughly 60 N/mm2 in compression at 7 days alongside 20 N/mm2 tensile and 45 N/mm2 flexural strength, so it takes bending and prying actions at plate edges, not just direct bearing. The hardener chemistry is moisture-insensitive, letting it bond to damp (not wet) concrete, and the tightly cross-linked structure is what delivers the low creep and broad chemical resistance under sustained plant loading.
Where it is used
- Under-plate grouting of machinery base plates with clearances below 10 mm
- Base plate grouting under dynamic loads — turbines, compressors and reciprocating machinery
- Pressure injection of static and structural cracks in concrete and masonry
- Grouting of anchor bolts and fixings where a fluid, high-strength fill is needed
- Crane rails, transporter rails and rail-track support applications
- Heavy industrial duty in steelworks, refineries, chemical plants and electroplating works
- Bonding and sealing duties on damp substrates where cementitious systems struggle
Key advantages
- Free-flowing all-liquid resin fills gaps from just 0.25 mm — beyond the reach of filled grouts
- High mechanical performance: 60 N/mm2 compressive, 20 N/mm2 tensile, 45 N/mm2 flexural at 7 days
- Rapid early strength gain shortens plant downtime and brings machinery back into service quickly
- Moisture-insensitive cure bonds reliably to damp concrete
- Low creep under sustained and repetitive dynamic load, even at elevated temperature
- Non-shrink cure keeps full plate-to-foundation contact and blocks ingress of deleterious substances
- Resists oils, greases, mild acids and alkalis, fresh water and seawater in service
- Pre-weighed 1.5 litre packs for foolproof full-pack mixing — no site batching errors
Limitations & considerations
- Limited to gaps of roughly 0.25-9 mm as supplied — deeper pours need a filled epoxy grout such as Conbextra EP65/EP75
- Pot life is only about 50 minutes at 27 degrees C and falls sharply in hot weather, so summer pours need cooled packs and tight sequencing
- Costs more per litre than cementitious precision grouts, so it is uneconomical for large-volume grouting
- Being extremely fluid, it will escape through any formwork defect — sealing and leak-proofing must be meticulous
- Cure slows significantly in cold conditions; keep within the temperature limits on the current datasheet
- Substrate must be sound and free of oil, laitance and standing water for the bond to develop
Selection & best practice
Prepare the foundation by removing laitance, oil and loose material, and blow gaps clear with oil-free air; the surface may be damp but never ponded. Build leak-proof formwork sealed with mastic or foam strip — Fosroc’s guidance is to keep the form within about 75 mm of the plate edge on the pouring side and 25 mm opposite, with air-relief holes at high spots, and to maintain a hydrostatic head so the resin flows continuously from one side only. Mix the complete pack, adding the entire hardener to the base and blending with a slow-speed stirrer until uniform — never split packs. In Indian summers, store packs shaded, cool components before mixing, and grout early morning to protect the 50-minute pot life. For crack injection, seal the crack face, fix ports, and inject from the lowest port upward until refusal.
Specifications
| Form / chemistry | Two-part, all-liquid, solvent-free epoxy resin (base + hardener) |
| Gap range (grouting) | 0.25 mm to 9 mm |
| Compressive strength | 60 N/mm2 at 7 days |
| Tensile strength | 20 N/mm2 at 7 days |
| Flexural strength | 45 N/mm2 |
| Density (mixed) | Approx. 1,060 kg/m3 |
| Pot life | Approx. 50 minutes at 27 degrees C |
| Pack size | 1.5 litre pack (yields 1.5 litres mixed) |
| Shelf life | 12 months in unopened packs, dry store |
Industry use cases
Power & Heavy Engineering
Thin-clearance grouting under turbine, compressor and DG-set base plates where alignment leaves only millimetres of gap and dynamic load rules out cementitious fills.
Steel, Refinery & Chemical Plants
Machine plinths, rail supports and fixings exposed to oils, fuels and mild process chemicals that would attack ordinary grout.
Rail & Material Handling
Grouting crane rails and transporter rails to full bearing contact so repetitive wheel loads do not work fixings loose.
Bridges & Structural Repair
Pressure injection of static structural cracks in girders, decks and masonry to restore monolithic behaviour and seal out water.
Industrial Maintenance Contractors
A single stocked product covering both precision regrouting during shutdowns and crack injection on the same outage.
Frequently asked questions
How is Conbextra EP10(M) different from a cementitious grout like Conbextra GP2?
Can it really be used for crack injection as well as grouting?
What is the working time on a hot Indian site?
The concrete is damp after cleaning — do I have to wait for it to dry?
My bearing gap is 20 mm. Can I still use EP10(M)?
How far does a 1.5 litre pack go?
How we position Fosroc Conbextra EP10(M)
Within the Fosroc family, think of EP10(M) as the fine-clearance specialist: for bearing gaps beyond 9 mm specify Conbextra EP65 or EP75 filled epoxy grouts, for everyday precision grouting at lower cost use cementitious Conbextra GP1 or GP2, and for dedicated crack-injection programmes with port systems consider Nitofill LV. Space Arc also stocks comparable injection and grouting lines from Sika and MC-Bauchemie, so if your tender is written around another brand we can match the specification or offer the Fosroc equivalent with technical justification.
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