Fosroc Auramix P269
A polymer-based plasticising and water-reducing admixture engineered for ready-mix concrete, delivering up to 15-25% water reduction with sustained workability even in hot Indian site conditions.
What is it?
A liquid plasticising water-reducing admixture for ready-mixed concrete, built on a blend of advanced synthetic (and natural) polymer molecules that disperse cement particles to cut mixing water while holding workability.
Where is it used?
Ready-mix and batched concrete for general structural work, slabs, columns, foundations and pumped/transported concrete where a normal-range water reduction and longer slump retention are needed.
Why use it?
It reduces water demand by roughly 15-25% depending on dosage, raising strength and durability for a given workability, improving surface compaction, and resisting rapid slump loss in warm weather.
How is it applied?
Dosed into the gauging water at the batching plant or mixer at about 0.5-1.2 litres per 100 kg of cementitious material; never added to dry cement. Optimum dosage is fixed by trial mixes with the project’s actual materials.
About Fosroc Auramix P269
Fosroc Auramix P269 is a ready-to-use liquid admixture from Fosroc’s Auramix family of concrete water reducers and plasticisers. It is formulated from a carefully engineered blend of advanced polymer molecules that adsorb onto cement grains and disperse them, freeing the water otherwise trapped between flocculated particles. The practical result is a more fluid, cohesive mix at the same water content, or the same workability achieved with substantially less water. Per Fosroc’s published product data, P269 delivers a strong water reduction in the region of 15-25%, the exact figure depending on the dosage adopted and the mix design. For Indian contractors, consultants and ready-mix producers, P269 sits in the everyday-workhorse zone of the admixture spectrum: it is a plasticiser (normal-range water reducer), not a high-range superplasticiser. That makes it well suited to standard structural grades where a moderate water cut, improved cohesion and reliable slump retention matter more than the extreme water reduction targeted by polycarboxylic-ether (PCE) superplasticisers. It is a single-component liquid, dosed straight into the gauging water, and is intended to be optimised through site trial mixes rather than applied at a fixed blanket dose. The product is documented under European admixture standard EN 934-2 as a water-reducing/plasticising admixture, placing it in the same performance category that Indian users will recognise as IS 9103 (water-reducing) admixtures and ASTM C494 normal water-reducing types. Space Arc Engineering supplies the broader Auramix range across Delhi NCR and Pan-India and can advise on the correct grade for a given specification, batching setup and exposure condition.
The technical insight
The dispersing action in Auramix P269 works primarily by electrostatic and steric repulsion: polymer chains coat the cement particles and push them apart, releasing flocculated water and lowering the water-to-cement ratio needed for a target slump. Because a lower w/c ratio is the single biggest lever on compressive strength and permeability, a 15-25% water reduction translates directly into denser, stronger, more durable concrete with a finer, better-closed surface. P269 is positioned as a plasticiser rather than a superplasticiser, so its dispersion efficiency and slump-retention window are tuned for normal-range water reduction and extended workability rather than the very high flow and very low w/c ratios that PCE superplasticisers such as Auramix 350, 400 or 500 are designed to reach. A defining feature Fosroc highlights is sustained plasticising effect in hot climates, meaning the molecule is engineered to resist the rapid early slump loss that plagues plain plasticisers when ambient and concrete temperatures are high, a real advantage on Indian sites and in long-haul ready-mix delivery. Like all Auramix water reducers it is a chloride-free type, compatible with reinforced and prestressed concrete. Note: Fosroc’s public P269 page states the water-reduction range, dosage band and EN 934-2 classification but does not publish an exact specific gravity, chloride limit or pack size for this specific code; those values should be confirmed against the current local Technical Data Sheet for your country before specification.
Where it is used
- Ready-mix concrete production where moderate water reduction and consistent workability are required across multiple grades
- General reinforced concrete structural elements: columns, beams, slabs, footings and raft foundations
- Pumped and transported concrete needing extended slump retention during haulage and placement
- Concrete cast in hot weather where plain plasticisers lose slump too quickly
- Watertight and durable concrete where a lower water-cement ratio improves density and reduces permeability
- Mass and high-volume pours benefiting from improved cohesion and reduced segregation
- Concrete incorporating fly ash, GGBS or microsilica as part of the cementitious blend
Key advantages
- Strong water reduction of around 15-25% depending on dosage, lifting strength and durability for a given workability
- Improved workability and cohesion, making placing, compaction and finishing easier
- Sustained plasticising effect in hot climates, resisting rapid slump loss on Indian sites
- Lower water-cement ratio yields denser, less permeable, more durable concrete
- Better surface appearance and compaction through advanced synthetic polymer molecules
- Chloride-free formulation, safe for reinforced and prestressed concrete
- Single-component liquid that is simple to dose accurately into the gauging water
- Documented to EN 934-2:2010 Table 2 as a water-reducing/plasticising admixture
- Backed by Fosroc’s global admixture technology and local technical support through Space Arc Engineering
Limitations & considerations
- It is a normal-range plasticiser, not a superplasticiser; for very low water-cement ratios or self-compacting/high-flow concrete, a PCE superplasticiser such as Auramix 350/400/500 is more appropriate
- Optimum dosage must be established by site trial mixes; overdosing can cause excessive retardation, bleeding or segregation
- Performance varies with cement source, supplementary cementitious materials, aggregate gradation and temperature, so results from one mix do not automatically transfer to another
- Must be added to the gauging water or wet mix, never to dry cement, and requires accurate dispensing equipment
- Fosroc’s public page does not publish an exact specific gravity, chloride content or pack size for the P269 code; the current local TDS must be obtained to confirm these before specifying
- Availability of this specific code in the Indian market should be confirmed with the distributor, as the Auramix numbering varies by region
- Not a waterproofing admixture or a substitute for proper curing, cover and mix design
Selection & best practice
Always establish the optimum dosage by trial mixes using the project’s actual cement, supplementary cementitious materials, aggregates and target slump, starting within the 0.5-1.2 litres per 100 kg cementitious material band and adjusting for the required water reduction. Add Auramix P269 to the gauging water or the wet concrete during mixing, never to the dry cement, and use a calibrated dispenser for repeatable dosing. Hold the water-cement ratio down to capture the strength and durability benefit rather than simply increasing slump. Verify compatibility before scaling up if other admixtures (retarders, air-entrainers, superplasticisers) are used in the same mix, and store drums sealed, out of direct sun and above freezing. Confirm the current local Technical Data Sheet and Safety Data Sheet for exact specific gravity, chloride limit, shelf life and pack sizes, and involve Space Arc Engineering’s technical team for grade selection on critical or high-exposure structures.
Specifications
| Product type | Plasticising water-reducing admixture for ready-mixed concrete |
| Base / chemistry | Blend of advanced synthetic (and natural) polymer molecules |
| Primary function | Water reduction and improved workability (normal-range plasticiser) |
| Typical water reduction | Approx. 15-25% depending on dosage |
| Recommended dosage | Approx. 0.5-1.2 litres per 100 kg of cementitious material (confirm by trial mixes) |
| Standard | EN 934-2:2010, Table 2 (water-reducing / plasticising admixture) |
| Indian / international equivalence | Corresponds to IS 9103 water-reducing and ASTM C494 normal water-reducing admixture category (verify against local TDS) |
| Chloride content | Chloride-free type, suitable for reinforced and prestressed concrete (confirm exact limit on local TDS) |
| Specific gravity | Not published on the official P269 page; obtain from current local TDS |
| Form / appearance | Liquid admixture, added to gauging water |
| Application method | Dosed into the gauging water or wet mix at the batching plant; not added to dry cement |
| Pack size | Not stated for P269 on the official page; Auramix liquids are commonly supplied in drums or bulk (confirm locally) |
Industry use cases
Ready-mix concrete (RMC)
Plant-dosed across multiple standard grades to cut water demand, hold slump through delivery and improve cohesion of pumped concrete.
Building structures
Reinforced columns, beams, slabs and foundations where a moderate water reduction raises strength and durability without moving to a full superplasticiser.
Infrastructure and general civil works
High-volume and continuous pours where improved workability, reduced segregation and lower permeability are valued.
Hot-weather concreting
Sites across Delhi NCR and the rest of India where the sustained plasticising effect resists rapid slump loss in high ambient temperatures.
Durability-focused concrete
Watertight and exposure-rated elements where a lower water-cement ratio improves density and reduces ingress of water and aggressive ions.
Frequently asked questions
Is Fosroc Auramix P269 a superplasticiser?
What dosage of Auramix P269 should I use?
How is it added to the concrete?
Does Auramix P269 contain chlorides?
Which standards does it comply with?
Can I buy Fosroc Auramix P269 in India through Space Arc Engineering?
How we position Fosroc Auramix P269
Auramix P269 occupies the normal-range plasticiser tier of Fosroc’s admixture portfolio, ideal where a reliable 15-25% water reduction and good slump retention are needed rather than maximum flow. It pairs naturally with the rest of the Space Arc Fosroc line-up: step up to PCE superplasticisers such as Fosroc Auramix 350, Auramix 400 or Auramix 500 for low water-cement ratios, high-grade or self-compacting concrete; consider Auramix 200 as a modern PCE-based all-rounder; and use Auramix 300/350 DIS variants where extended retardation is required. Within the wider market, Indian buyers will weigh P269 against comparable normal/mid-range water reducers from Sika (the Sikament and Plastiment families), Master Builders Solutions (MasterPozzolith / MasterPolyheed), Pidilite’s Dr. Fixit admixture range, and STP. Fosroc’s edge here is the hot-climate slump-retention chemistry and a deep, well-supported Auramix family that lets a specifier scale smoothly from plasticiser to high-range superplasticiser without changing supplier. As always, the right choice is confirmed by trial mixes and by matching the local Technical Data Sheet to the project’s exposure class and batching setup, which is where Space Arc Engineering’s distributor support adds value.
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