Fosroc Auracast 100
Low-viscosity PCE superplasticiser engineered for precast yards — strip moulds earlier and hit demoulding strength at ambient temperature, without extra cement or a steam-curing bill.
What is it?
A latest-generation polycarboxylic ether (PCE) high-range water-reducing admixture from Fosroc, formulated specifically for precast concrete production rather than ready-mix supply.
Where is it used?
Precast plants across India producing hollow-core slabs, paver blocks, masonry blocks, cement tiles, kerbstones and other repetitive-mould elements.
Why use it?
It cuts mixing water sharply and speeds early hydration, so elements reach stripping strength sooner — more casts per mould per day with no added cement and no steam curing.
How is it applied?
Metered into the gauging water through a calibrated dispenser during batching, at a dose fixed by plant trials with the actual cement, fly ash or GGBS being used.
About Fosroc Auracast 100
In a precast yard, the mould is the bottleneck. Every hour an element sits waiting for stripping strength is an hour that mould earns nothing. Fosroc Auracast 100 attacks exactly this constraint: it is a low-viscosity liquid superplasticiser built on polycarboxylic ether (PCE) chemistry, tuned so that concrete gains early strength quickly at ambient temperature. Producers get faster demoulding cycles without pushing cement content up, without steam curing, and without sacrificing surface quality on the finished unit.
The formulation conforms to IS 9103:1999 as a superplasticiser and behaves as ASTM C494 Type F or Type G depending on dose. Because it delivers strong water reduction at low viscosity, it suits the stiff, low water-cement-ratio mixes typical of block, paver and tile machines as well as wet-cast hollow-core production. Space Arc Engineering supplies Auracast 100 in 250 kg drums to precast units across Delhi NCR and pan-India, with technical support for plant trials and dosage fixing.
The technical insight
Auracast 100 works by steric dispersion rather than the purely electrostatic action of older SNF/SMF plasticisers. Its PCE polymer has a short main chain that adsorbs onto cement grains and long side chains that project outward, physically holding particles apart. This breaks up cement flocs and releases the water trapped inside them, so the same workability is achieved at a much lower water-cement ratio. With less free water, the paste is denser and hydration products bridge between grains sooner — which is what converts into early demoulding strength, tighter surfaces, and better long-term resistance to carbonation, shrinkage and efflorescence. The catch is sensitivity: PCE response shifts with cement C3A content and with fly-ash or GGBS replacement, which is why Fosroc fixes dosage by trial rather than publishing one generic figure.
Where it is used
- Hollow-core slab and prestressed plank production lines
- Interlocking paver blocks and paving units
- Solid and hollow concrete masonry blocks and bricks
- Cement roofing and flooring tile manufacture
- Kerbstones, channels, edgings and road furniture
- Garden and landscape precast elements
- Structural precast where steam curing is to be avoided or reduced
- Low water-cement-ratio mixes incorporating fly ash or GGBS
Key advantages
- Earlier de-shuttering raises mould turnover and daily plant output
- Early strength achieved without increasing cement content, protecting cost per element
- High water reduction enables dense, low w/c mixes with better durability
- Cleaner off-the-mould surface finish and fewer breakages during early handling
- Reduced efflorescence, shrinkage and creep, with improved carbonation resistance
- Compatible with fly ash and GGBS blended mixes common in Indian precast
- Low-viscosity liquid meters accurately through automatic dispensers
- Can cut or eliminate steam-curing energy costs in many product lines
Limitations & considerations
- Formulated for precast cycles, not for ready-mix hauls needing extended slump retention — the Fosroc Auramix range serves that duty
- Dose response varies with cement chemistry (notably C3A) and SCM replacement, so trial mixes with the actual cement are mandatory before production
- Overdosing can cause bleeding, segregation or set retardation; incremental dosing discipline is essential
- Fosroc publishes no generic dosage or water-reduction percentage — values must come from the current batch TDS and plant trials
- Storage is frost- and heat-sensitive; drums must stay sealed, off the ground and shaded
- It is an accelerating aid to a good mix design, not a substitute for proper grading, compaction or curing
Selection & best practice
Fix the dosage before you fix the production schedule. Run trial mixes with the exact cement brand and grade you buy, including any fly ash or GGBS replacement, and start at the low end of the range in the current Fosroc TDS. Add Auracast 100 to the gauging water or during batching through calibrated dispensing equipment — never onto dry cement, where localised overdose causes erratic behaviour. Step the dose up in small increments while watching for bleeding, segregation or delayed set, the classic overdose signals with PCE admixtures. Before shortening the demoulding cycle on the line, verify stripping strength on trial units, not just cube results. Store drums sealed, off the ground, protected from frost and direct sun, and confirm shelf life and any re-stirring requirement from the TDS before use.
Specifications
| Chemical base | Polycarboxylic ether (PCE) polymer — long side chains, short main chain |
| Form | Low-viscosity liquid |
| Function | High-range water reducer / precast superplasticiser |
| Standards compliance | IS 9103:1999; ASTM C494 Type F and G (dosage-dependent) |
| Dosage | Fixed by plant trial mixes; refer to current Fosroc TDS for the batch |
| Cement compatibility | OPC, PPC and blends with fly ash or GGBS (trial-verified) |
| Pack size | 250 kg drum |
| Storage | Sealed, off the ground, protected from frost and direct sunlight |
Industry use cases
Hollow-core and structural precast plants
Prestressed plank and hollow-core producers use Auracast 100 to reach transfer and stripping strengths overnight at ambient temperature, keeping beds on a 24-hour cycle without steam.
Paver and block manufacturing units
Semi-dry, low w/c machine mixes gain green strength and edge sharpness, cutting rejection from handling damage on high-volume paver and CMU lines.
Cement tile factories
Roofing and flooring tile producers get denser matrices and reduced efflorescence — a visible quality difference on pigmented and polished tiles.
Road and urban infrastructure precasters
Kerbstone, channel and edging yards supplying NHAI, PWD and smart-city contracts turn moulds faster during peak delivery schedules.
Landscape and building-products manufacturers
Garden elements, fencing posts and architectural units achieve better off-mould finish, reducing rework and rendering costs.
Frequently asked questions
What dosage of Auracast 100 should I start with?
Can Auracast 100 fully replace steam curing?
Does it work with PPC, fly ash or GGBS mixes?
How is it different from SNF plasticisers like Conplast SP430?
Is Auracast 100 ASTM C494 Type F or Type G?
What pack size does Space Arc supply, and how should drums be stored?
How we position Fosroc Auracast 100
Auracast 100 is the precast specialist in Fosroc’s admixture family, and it should be specified as one. If your plant also produces self-compacting or highly flowable precast mixes, ask us about the higher-grade Auracast products such as Auracast 270M, which Space Arc also supplies. For ready-mix supply where slump must survive a long haul, the correct choice is the Fosroc Auramix PCE range rather than stretching Auracast beyond its design brief, and for conventional site-batched work at moderate water reduction, Fosroc Conplast SP430 remains the economical SNF workhorse. Producers standardising on other brands can source equivalent precast PCE technology through us as well — Sika’s ViscoCrete line and Master Builders Solutions’ MasterGlenium ACE series serve the same duty — but within a Fosroc-specified project, Auracast 100 pairs naturally with Fosroc curing compounds and mould-release agents from our stock.
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