Fosroc Cebex 200
Plasticising, chloride-free, hydrogen-free expansion admixture in 225 g packs for cementitious bed grouts, duct grouting and non-shrink infilling.
What is it?
A plasticising and hydrogen-free expansion grout admixture supplied as a powder. Cebex 200 acts as a plasticiser and an expansive medium that compensates for plastic settlement and shrinkage in cementitious grouts, while allowing a reduced water/cement ratio. It contains no metallic iron and generates no hydrogen gas.
Where is it used?
Bed grouting under base plates and machinery, post-tensioning duct grouting, and general non-shrink infilling and jointing on Indian construction and infrastructure projects.
Why use it?
It delivers controlled positive expansion to counter plastic settlement, improves grout flow at a lower water/powder ratio for higher strength, and is chloride-free with no metallic iron, so there is no risk of rust staining or chloride-induced corrosion.
How is it applied?
Dosed as a powder admixture into the cementitious mix at 4 x 225 g units per 100 kg of cement (225 g per 50 kg of OPC) for mixes with an aggregate/cement ratio above 1, mixed at a water/powder ratio of 0.39 to 0.45.
About Fosroc Cebex 200
Fosroc Cebex 200 is a plasticising and hydrogen-free expansion grout admixture, supplied as a powder, used to produce non-shrink cementitious grouts and mortars on Indian construction sites. It performs two roles in a single addition: it plasticises the mix so that the grout flows readily at a reduced water content, and it provides a controlled, hydrogen-free expansive action that compensates for the plastic settlement and shrinkage that would otherwise leave voids beneath base plates and within ducts. Importantly, Cebex 200 is NOT a gas-generating or aluminium-powder gassing agent. It contains no metallic iron and generates no hydrogen gas, so it does not rely on a gas-evolution reaction and produces no rust or staining. The expansion is a controlled positive expansion measured to ASTM C827, with an unrestrained expansion of up to 2% typical. Because the admixture allows a lower water/cement ratio while keeping the grout fluid, the hardened grout develops early strength without the use of chlorides, giving dense, durable contact between the grout and the surfaces it bonds. Space Arc Engineering supplies Cebex 200 as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India. For project teams comparing options, the broader Fosroc grouting range includes the Conbextra family of cementitious and epoxy grouts; comparable admixture systems are offered by brands such as BASF Master Builders Solutions (MasterFlow), Sika and Dr. Fixit, though Cebex 200 remains the reference plasticising, hydrogen-free expansion admixture in many Indian grouting specifications.
The technical insight
The defining technical feature of Cebex 200 is its hydrogen-free expansion system. Unlike aluminium-powder gassing agents that liberate hydrogen gas in the fresh alkaline mix, Cebex 200 contains no metallic iron and evolves no hydrogen; its controlled positive expansion is measured per ASTM C827 and reaches an unrestrained expansion of up to 2% typical, with expansion occurring over roughly 15 minutes to 2 hours (ambient temperatures above 20C may slightly reduce these times). This plastic-stage expansion offsets settlement before the grout sets, giving full, void-free contact. The chloride content is Nil to BS 5075, and combined with a recommended water/powder ratio of 0.39 to 0.45, the admixture supports early strength gain without introducing chlorides. The product may slightly retard the setting of cement-based grouts depending on the cement type and ambient temperature. Cebex 200 is compatible with all types of Portland cement but is INCOMPATIBLE with High Alumina Cement, which must not be used with this admixture.
Where it is used
- Bed grouting beneath machine base plates, columns and structural bearings
- Post-tensioning and pre-stressing duct grouting in cementitious grout
- Non-shrink infilling of voids, pockets and recesses
- Jointing and filling where a plasticised, controlled-expansion grout is required
- Producing non-shrink cementitious grouts and mortars on infrastructure and industrial projects
Key advantages
- Hydrogen-free expansion system with no metallic iron, so no rust or staining
- Controlled positive expansion (up to 2% typical, ASTM C827) compensates for plastic settlement and shrinkage
- Plasticising action allows a reduced water/powder ratio (0.39 to 0.45) for denser, stronger grout
- Chloride content Nil to BS 5075, supporting early strength without chloride-induced corrosion risk
- Compatible with all types of Portland cement
- Simple powder dosing in convenient 225 g packs
Limitations & considerations
- Incompatible with High Alumina Cement; use only with Portland cements
- May slightly retard the setting of cement-based grouts depending on cement and ambient temperature
- Expansion timing (15 minutes to 2 hours) can be shortened at temperatures above 20C, requiring placement planning in hot weather
- Performance depends on mixing at the recommended water/powder ratio of 0.39 to 0.45
- Shelf life of 6 months when kept in a dry store in original packing
Selection & best practice
Add Cebex 200 as a powder to the cementitious mix at the recommended dosage of 4 x 225 g units per 100 kg of cement (225 g per 50 kg of OPC) for grout, mortar or concrete mixes with an aggregate/cement ratio above 1, and mix at a water/powder ratio of 0.39 to 0.45. Use only Portland cement, never High Alumina Cement. Allow for the expansion window of 15 minutes to 2 hours and plan placement accordingly, remembering that ambient temperatures above 20C may shorten these times and that the admixture may slightly retard set. Store unopened 225 g packs in a dry store and use within the 6-month shelf life.
Specifications
| Type | Plasticising and hydrogen free expansion grout admixture (powder admixture) |
| Expansion system | Hydrogen free; no metallic iron content (no rust/staining) |
| Chloride content | Nil to BS 5075 |
| Expansion characteristics | Controlled positive expansion measured per ASTM C827; unrestrained expansion of up to 2% typical |
| Time of expansion | 15 minutes – 2 hours (temperatures above 20C may slightly reduce these times) |
| Setting time | May slightly retard setting of cement-based grouts depending on cement and ambient temperature |
| Suggested water/powder ratio | 0.39 to 0.45 (W/P) |
| Dosage | 225 g pack; for grout/mortar/concrete mixes with aggregate/cement ratio >1, use 4 x 225 g units per 100 kg of cement (e.g. 225 g per 50 kg OPC) |
| Packing | Supplied in 225 gm packs |
| Compatibility | Compatible with all types of Portland cement; INCOMPATIBLE with High Alumina Cement |
| Uses | Bed grouting, duct grouting, non-shrink infilling and jointing |
| Shelf life | 6 months in a dry store in original packing |
Industry use cases
Industrial & Power Plants
Bed grouting under machine base plates and structural bearings, where hydrogen-free, chloride-free controlled expansion gives full, void-free contact without rust staining.
Infrastructure & Bridges
Post-tensioning duct grouting using cementitious grout, where the plasticising action enables a low water/powder ratio for dense, durable grout filling.
Commercial & Structural Construction
Non-shrink infilling of pockets, voids and joints, where controlled positive expansion to ASTM C827 compensates for plastic settlement.
Frequently asked questions
Does Fosroc Cebex 200 generate hydrogen gas?
What type of admixture is Cebex 200?
What is Cebex 200 used for?
What is the recommended dosage and water/powder ratio?
Can Cebex 200 be used with any cement?
Does Cebex 200 contain chlorides?
How we position Fosroc Cebex 200
Positioned as the accurate, specification-grade Fosroc plasticising and hydrogen-free expansion grout admixture for Indian grouting works, supplied by Space Arc Engineering as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, with credible alternatives such as BASF Master Builders Solutions, Sika and Dr. Fixit named for comparison.
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