Fosroc Conplast SP430KRM6
Chloride-free, naphthalene-based high-range water-reducing superplasticiser for high-strength, precast, prestressed and flowing concrete – supplied and applied by Space Arc Engineering, your authorised Fosroc partner across Delhi NCR and Pan-India.
What is it?
Fosroc Conplast SP430KR(M)6 is a chloride-free, high-range water-reducing (HRWR) superplasticising admixture based on selected sulphonated naphthalene polymers (SNF). It is a brown liquid that instantly disperses in water, and is a genuine regional/grade variant within Fosroc’s established Conplast SP430 family.
Where is it used?
Used across Indian ready-mix (RMC) plants, precast and prestressed yards, and infrastructure works where high early strength, high water reduction and flowing/high-workability concrete are required – including high-strength structural concrete and screeds.
Why use it?
It delivers high early strength gain and high water reduction (>12% vs reference under EN 934-2), letting you cut water content for greater strength and durability or boost workability without extra water. Being chloride-free (Nil to BS 5075), it is suitable for reinforced and prestressed concrete.
How is it applied?
Dosed volumetrically at 0.70-2.00 litres per 100 kg of cementitious material for high-strength, water-reduced concrete (0.70-1.30 l/100 kg for high-workability mixes). Added to the gauging water or with the final water; never to dry aggregates. Trial mixes confirm the optimum dose for local materials and ambient conditions.
About Fosroc Conplast SP430KRM6
Fosroc Conplast SP430KR(M)6 is a high-performance superplasticising admixture engineered for demanding Indian concrete applications where both high early strength and substantial water reduction are required. It is formulated on selected sulphonated naphthalene polymers (SNF / sulphonated naphthalene formaldehyde condensate) and is supplied as a brown liquid that instantly disperses in water for rapid, uniform action in the mix. SP430KR(M)6 is a genuine regional/grade variant within Fosroc’s well-established Conplast SP430 family of naphthalene-based superplasticisers.
Crucially, the product is chloride-free (Nil to BS 5075), making it fully appropriate for reinforced, precast and prestressed concrete where chloride-induced corrosion of steel must be avoided. By dispersing cement particles efficiently, it allows a significant reduction in mix water – more than 12% compared with a reference mix under EN 934-2 – which can be exploited either to raise compressive strength and durability at constant workability, or to achieve high-workability and flowing concrete without increasing water content. This dual capability makes it a workhorse admixture for RMC suppliers, precast manufacturers and infrastructure contractors across Delhi NCR and Pan-India.
As an authorised Fosroc distributor and applicator, Space Arc Engineering supplies genuine, batch-traceable Conplast SP430KR(M)6 with technical support on dosage optimisation, trial mixes and compatibility – so your structural and high-strength concrete performs to specification on site, including under hot-weather placing conditions common across the Indian plains.
The technical insight
Conplast SP430KR(M)6 works by adsorbing onto cement and cementitious particles and imparting a strong negative surface charge. This electrostatic repulsion – characteristic of sulphonated naphthalene formaldehyde (SNF) chemistry – deflocculates cement grains, releasing trapped water and dramatically improving particle dispersion. The result is a high-range plasticising effect that yields either greater workability at the same water content, or equivalent workability at a much lower water/cement ratio (>12% water reduction vs reference per EN 934-2).
The admixture is compatible with cementitious blends incorporating PFA (fly ash), GGBFS and microsilica, and its dosage is expressed against total cementitious content – not cement alone. Critically, the correct dose is VOLUMETRIC: 0.70-2.00 litres per 100 kg of cementitious material for high-strength, water-reduced concrete, and 0.70-1.30 litres per 100 kg for high-workability concrete. (A common page error is to state dose as a percentage by weight of cement; the manufacturer’s TDS specifies litres per 100 kg, and this distinction matters for accurate batching.) At normal dosages, air entrainment is typically less than 2% additional air, so it does not behave as an air-entraining agent. Alkali content is typically less than 72.0 g Na2O equivalent per litre of admixture, which should be accounted for in total alkali calculations for alkali-silica reaction (ASR) sensitive aggregates. Always establish the optimum dose by site trial mixes, since cement source, supplementary materials, aggregate and temperature all influence response.
Where it is used
- High-strength structural concrete where a low water/cement ratio is required
- Precast concrete elements demanding high early strength and fast mould turnaround
- Prestressed concrete units requiring chloride-free admixtures
- High-workability and flowing concrete placed without added water
- Ready-mix concrete (RMC) for infrastructure, commercial and high-rise projects
- Concrete incorporating PFA, GGBFS or microsilica blends
- Floor screeds and toppings requiring improved workability and finish
Key advantages
- Chloride-free (Nil to BS 5075) – safe for reinforced and prestressed concrete
- High water reduction of more than 12% versus reference mix (EN 934-2), improving strength and durability
- Promotes high early strength gain, accelerating precast mould cycles and formwork striking
- Compatible with PFA, GGBFS and microsilica cementitious blends
- Brown liquid that instantly disperses in water for rapid, uniform mixing
- Low air entrainment – typically less than 2% additional air at normal dosages
- Internationally certified: BS 5075 Part 3, ASTM C494 Type A and Type F, EN 934-2
- Supplied genuine and batch-traceable by an authorised Fosroc distributor with on-site technical support
Limitations & considerations
- Optimum dosage must be confirmed by site trial mixes; cement source, supplementary materials and temperature affect response
- Dosage is volumetric (litres per 100 kg cementitious), not a percentage by weight – incorrect batching basis leads to under/over-dosing
- Overdosing can cause excessive retardation or, in some mixes, segregation/bleeding – stay within the recommended range
- Contributes to total mix alkali (typically <72.0 g Na2O eq/litre); account for this with ASR-reactive aggregates
- Should be added to the gauging water or final water, not directly onto dry aggregates or cement
- Not an air-entraining admixture – where freeze-thaw air content is required, a separate air entrainer is needed
Selection & best practice
Add Conplast SP430KR(M)6 to the gauging water or with the final portion of mixing water – never onto dry cement or aggregate – to ensure uniform dispersion. Begin trials near the lower end of the recommended volumetric range (0.70 l/100 kg of cementitious material) and increase towards 2.00 l/100 kg only as needed for high-strength, water-reduced mixes, or up to 1.30 l/100 kg for high-workability concrete. Always validate the final dose with project-specific trial mixes using your actual cement, supplementary cementitious materials and aggregates, and account for the admixture’s water contribution in the water/cement ratio. In hot weather, schedule placing and finishing promptly and consult Space Arc’s technical team on combining with a suitable retarder if extended workability retention is required.
Specifications
| Chemical base | Sulphonated naphthalene polymers (SNF/SNFC), chloride-free superplasticiser |
| Appearance | Brown liquid |
| Specific gravity | Typically 1.20 at 20°C |
| Chloride content | Nil (to BS 5075) |
| Dosage (high-strength, water-reduced concrete) | 0.70 to 2.00 litres/100 kg of cementitious material (incl. PFA, GGBFS, microsilica) |
| Dosage (high-workability concrete) | 0.70 to 1.30 litres/100 kg of cementitious material |
| Water reduction (EN 934-2) | >12% compared with reference mix |
| Air entrainment | Typically less than 2% additional air at normal dosages |
| Alkali content | Typically less than 72.0 g Na2O equivalent/litre of admixture |
| Standards compliance | BS 5075 Part 3; ASTM C494 Type A and Type F; EN 934-2 (T3.1/3.2) |
| Primary use | High early strength gain and high water reduction; precast, prestressed and high-strength/flowing concrete; screeds |
Industry use cases
Ready-Mix Concrete (RMC)
RMC plants across Delhi NCR use Conplast SP430KR(M)6 to produce high-strength, low water/cement concrete with controlled workability for long-haul deliveries to high-rise and commercial sites.
Precast Manufacturing
Precast yards exploit the high early strength gain to accelerate mould turnaround and de-moulding cycles, improving production throughput for beams, panels and segments.
Prestressed Concrete
Its chloride-free (Nil to BS 5075) formulation makes it suitable for prestressed girders and sleepers where protection of high-tensile steel against corrosion is critical.
Infrastructure & High-Strength Works
Bridges, flyovers and structural elements requiring high-grade concrete benefit from >12% water reduction (EN 934-2) for enhanced strength and durability.
Blended-Cement Concrete
Mixes incorporating PFA, GGBFS or microsilica use SP430KR(M)6 to maintain workability and strength while leveraging supplementary cementitious materials for durability and sustainability.
Frequently asked questions
What is Fosroc Conplast SP430KR(M)6 and what type of admixture is it?
What is the correct dosage for Conplast SP430KR(M)6?
Which standards does Conplast SP430KR(M)6 comply with?
How much water reduction does it provide?
Is Conplast SP430KR(M)6 safe for reinforced and prestressed concrete?
What is the specific gravity and appearance of the product?
Does it entrain air into the concrete?
Where can I buy genuine Conplast SP430KR(M)6 in India?
How we position Fosroc Conplast SP430KRM6
Positioned as a chloride-free, naphthalene-based (SNF) high-range water-reducing superplasticiser within Fosroc’s Conplast SP430 family, SP430KR(M)6 sits in the high-performance HRWR segment for high-strength, precast, prestressed and flowing concrete. It competes with SNF and PCE-based superplasticisers from brands such as BASF/Master Builders Solutions (MasterRheobuild/Glenium), Sika (Sikament/ViscoCrete) and Chryso, where a proven, internationally certified (BS 5075, ASTM C494 A & F, EN 934-2) naphthalene superplasticiser is required. Space Arc Engineering leads with genuine Fosroc supply, authorised-distributor traceability and on-site technical support across Delhi NCR and Pan-India.
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