Product Overview

Conplast SP550 is a high-performance, high-range water-reducing superplasticiser based on sulphonated naphthalene formaldehyde condensate conforming to ASTM C494 Type F (high-range water reducer). It belongs to the second generation of synthetic superplasticisers that were the industry standard for high-strength and high-workability concrete before the emergence of polycarboxylate ether (PCE) technology. At the correct dosage, Conplast SP550 can reduce the water demand of a concrete mix by 25% to 30% while maintaining equivalent workability, enabling the production of high-strength concrete (M50 to M70) at water-cement ratios that would be impossible to achieve with conventional plasticisers. Alternatively, without any water reduction, Conplast SP550 can produce flowing or self-compacting concrete with slumps of 200 mm or higher for easy placing in densely reinforced sections or for pumping over long distances without segregation. The naphthalene sulphonate chemistry is well-established, with a long track record of performance in the Indian ready mix and precast concrete market. Conplast SP550 is compatible with all Portland cements (OPC, PPC, PSC) and with supplementary cementitious materials. For projects requiring very high workability retention over longer delivery times, the PCE-based Auramix range should be considered as an alternative. Space Arc Engineering distributes Conplast SP550 for high-rise, infrastructure, and precast concrete projects across Delhi NCR, Ghaziabad, and Northern India.

Applications

• High-strength concrete grades M50 to M70 for multi-storey buildings and bridges
• Flowing and self-compacting concrete for congested reinforcement zones
• Pump concrete for high-rise building columns and core walls
• Precast concrete for early demoulding and high production throughput
• High-slump pile and drilled shaft concrete without segregation
• Low water-cement ratio durable concrete for marine and infrastructure exposure

Key Advantages

• High-range water reduction of 25–30% versus control at equivalent workability
• ASTM C494 Type F high-range water reducer compliance
• Established naphthalene sulphonate technology with long track record
• Enables high-strength concrete grades M50 to M70
• Produces flowing concrete at 200 mm slump without bleeding or segregation
• No chlorides — safe for reinforced and prestressed concrete