Fosroc Auramix 300 Plus
Latest-generation polycarboxylic ether (PCE) superplasticiser engineered for long workability retention (4 hours and more) and excellent rheology in high-performance and mass concrete.
What is it?
Fosroc Auramix 300 Plus is a polycarboxylic ether (PCE) based superplasticiser built on a latest-generation polymer with long lateral chains, functioning as a high-range water-reducing and retarding admixture (ASTM C494 Type G).
Where is it used?
Used across Delhi NCR and Pan-India in ready-mix and site-batched concrete for mass concreting and raft foundations, free-flow concrete, and high-performance concrete where workability must be held over long haul and placement times.
Why use it?
It delivers long workability retention of 4 hours and more with good rheology, has nil chloride content, and complies with ASTM C494 Type G and IS:9103-1999 – making it dependable for demanding pours and extended transit.
How is it applied?
Dosed typically at 0.3 to 2.0 litres per 100 kg of cementitious material and added to the mixing water or wet concrete; optimum dosage is established by site trials. Supplied by Space Arc Engineering, an authorised Fosroc distributor and applicator.
About Fosroc Auramix 300 Plus
Fosroc Auramix 300 Plus is a robust, ready-to-use concrete admixture from the Auramix 300 family, formulated as a polycarboxylic ether (PCE) based superplasticiser. Unlike older sulphonated naphthalene formaldehyde (SNF/naphthalene) plasticisers, it is built on a latest-generation polycarboxylic ether polymer carrying long lateral chains. These side chains generate strong steric dispersion of cement particles, allowing the admixture to function as a high-range water-reducing and retarding admixture conforming to ASTM C494 Type G.
The defining benefit of Auramix 300 Plus is long workability retention – 4 hours and more – combined with good rheology. For Indian projects where concrete must survive long transit from a central batching plant to site, queue at the pump in congested urban traffic, or be placed continuously in large pours, this extended retention window keeps concrete cohesive, flowable and easy to place without resorting to unauthorised re-tempering with water.
As an authorised Fosroc distributor and applicator serving Delhi NCR and Pan-India, Space Arc Engineering supplies Auramix 300 Plus with full technical back-up, from trial mix design support to on-site dosage optimisation. Where a project specifies an alternative, comparable polycarboxylic-ether superplasticisers in the Indian market include BASF MasterGlenium, Sika ViscoCrete and Chryso (Cera) PCE ranges; however, leading with the Fosroc Auramix 300 system gives applicators a single, supported supply chain backed by Fosroc’s documented compliance to ASTM C494 Type G and IS:9103-1999.
The technical insight
The performance of Auramix 300 Plus stems from its polycarboxylic ether backbone with long lateral (comb) chains. When the admixture adsorbs onto cement grains, these grafted side chains project outward and create steric hindrance that keeps particles dispersed far longer than the electrostatic repulsion offered by older naphthalene (SNF) chemistry. This sustained dispersion is what produces the hallmark 4-hours-and-more workability retention with good rheology, rather than the rapid slump loss typical of conventional plasticisers. Because it is classified under ASTM C494 as a Type G admixture, it combines high-range water reduction with controlled retardation of set – useful for large mass pours where early stiffening must be avoided. The Auramix 300 family carries nil chloride content (to IS:456), so it is suitable for reinforced and prestressed concrete without contributing to reinforcement corrosion risk. Optimum dosage within the typical 0.3 to 2.0 litres per 100 kg of cementitious material should always be confirmed by site trials, as it depends on cement type, supplementary cementitious materials, ambient temperature and the target slump/flow.
Where it is used
- Mass concreting and raft foundations where continuous placement and controlled set are critical
- Free-flow concrete requiring high flowability with good rheology and resistance to segregation
- Concrete needing long workability retention (4 hours and more) for extended transit or placement times
- High-performance concrete in demanding structural and infrastructure works
- Reinforced and prestressed concrete, supported by the nil chloride content of the Auramix 300 family
Key advantages
- Long workability retention of 4 hours and more, keeping concrete placeable through extended transit and large pours
- Built on a latest-generation polycarboxylic ether (PCE) polymer with long lateral chains for superior particle dispersion
- High-range water-reducing and retarding performance classified as ASTM C494 Type G
- Complies with ASTM C494 Type G and IS:9103-1999 for specification confidence
- Nil chloride content (Auramix 300 family, to IS:456), suitable for reinforced and prestressed concrete
- Good rheology supports cohesive, easy-to-place and easy-to-pump free-flow concrete
- Supplied and technically supported Pan-India by Space Arc Engineering, an authorised Fosroc distributor and applicator
Limitations & considerations
- Optimum dosage must be established by site trials; performance varies with cement, SCMs, temperature and target workability
- As a Type G (water-reducing and retarding) admixture, the controlled retardation should be accounted for in cold-weather or fast-strip schedules
- PCE superplasticisers can be sensitive to overdosing, which may cause excess retardation or bleeding/segregation if mix water is not adjusted
- Should not be combined with other admixtures without first confirming compatibility through trials
- Shelf life is a minimum of 12 months when stored at 20-50C; storage outside this range can shorten usable life
Selection & best practice
Always establish the optimum dosage through site trial mixes within the typical 0.3 to 2.0 litres per 100 kg of cementitious material, rather than fixing a single dose, since the right addition rate depends on cement type, SCMs, ambient temperature and the target slump or flow. Add Auramix 300 Plus to the gauging water or to the wet concrete during mixing – never to dry cement – and avoid re-tempering placed concrete with water, since the 4-hours-and-more retention is designed to remove that need. Confirm compatibility before combining with any other admixture, and store drums sealed at 20-50C to protect the minimum 12-month shelf life. Space Arc Engineering can support trial mix design and on-site dosage optimisation as part of supply.
Specifications
| Chemical base | Polycarboxylic ether (PCE) polymer with long lateral chains (latest-generation superplasticiser) |
| Description | Robust concrete admixture for long workability retention with good rheology |
| Admixture classification | High-range water-reducing and retarding admixture – ASTM C494 Type G |
| Standards compliance | ASTM C494 Type G and IS:9103-1999 |
| Dosage | Typically 0.3 to 2.0 litres per 100 kg of cementitious material (confirm by site trials) |
| Workability retention | 4 hours and more |
| Chloride content | Nil (Auramix 300 family, to IS:456) |
| Appearance / colour | Light yellow coloured liquid (Auramix 300 base datasheet) |
| Specific gravity / volumetric mass | Approx. 1.085 kg/litre at 20C (Auramix 300 base datasheet) |
| Packaging | 200 kg and 250 kg drums, and bulk supply |
| Shelf life | Minimum 12 months when stored at 20-50C |
Industry use cases
Mass concrete and raft foundations
Large continuous pours for raft foundations and mass concreting benefit from the 4-hours-and-more retention and controlled Type G set, helping maintain cohesion and placeability throughout an extended placement.
Ready-mix concrete and long transit
For RMC plants supplying sites across Delhi NCR and Pan-India, the long workability retention keeps concrete placeable through extended haul times and on-site pump queues without water re-tempering.
High-performance and infrastructure concrete
Used in high-performance concrete for structural and infrastructure works where good rheology, high-range water reduction and nil chloride content are required.
Free-flow and pumped concrete
The PCE dispersion delivers free-flow concrete with good rheology, supporting easy pumping and placement into congested reinforcement while resisting segregation when correctly dosed.
Frequently asked questions
What type of admixture is Fosroc Auramix 300 Plus?
What dosage of Auramix 300 Plus should I use?
How long is the workability retention?
Which standards does Auramix 300 Plus comply with?
What is the appearance and specific gravity?
How is Auramix 300 Plus packaged and stored?
Can Space Arc Engineering supply Auramix 300 Plus Pan-India?
How we position Fosroc Auramix 300 Plus
Position Auramix 300 Plus as the long-retention PCE superplasticiser of choice for mass concrete, free-flow concrete and high-performance pours where concrete must stay placeable for 4 hours and more. Lead with the Fosroc Auramix 300 system and its documented ASTM C494 Type G and IS:9103-1999 compliance, with Space Arc Engineering as the authorised Pan-India distributor-applicator providing trial mix and dosage support. Name comparable PCE alternatives – BASF MasterGlenium, Sika ViscoCrete, Chryso PCE – only as context, while steering specifiers to the supported Fosroc supply chain.
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