About Sika Plastocrete Super

Sika Plastocrete Super is Sika India’s liquid integral waterproofing admixture, built around a modified naphthalene formaldehyde sulphonate chemistry. Unlike a surface membrane that sits on top of a slab, this product goes into the concrete or plaster at the mixing stage and stays there for the life of the structure. Its job is twofold: it acts as a water reducer, letting you hold the same workability with less mixing water, and it improves the watertightness of the hardened mass. Because so much of concrete’s permeability comes from the network of capillaries left behind by excess mix water, trimming that water at source is one of the most reliable ways to keep a slab or plaster coat dry. Space Arc Engineering supplies it as part of our Sika range across Delhi NCR and Pan-India, alongside the technical backing to specify the right dosage for your mix.

A point that matters on Indian sites: the formulation carries no added chloride, so it can be used in reinforced concrete without the corrosion worry that older, calcium-chloride-based waterproofing compounds carried. It is compatible with all common varieties of Portland cement, including Portland Slag Cement, and needs only a very small dosage, which keeps handling simple and cost per cubic metre low. The product conforms to IS 9103, IS 2645 and ASTM C-494, and comes in pack sizes from 100g sachets up to 100kg drums, so it suits everything from a small plastering job to a full RMC batching operation.

The technical insight

Concrete leaks because of its capillary pore structure, and that structure is largely a function of the water-to-cement ratio. Every litre of water added beyond what the cement needs to hydrate eventually leaves behind an interconnected void as it evaporates or bleeds, and those voids are the highways water later travels along. Plastocrete Super works on this root cause. As a naphthalene-sulphonate-based dispersant it deflocculates the cement grains, freeing trapped water and improving flow, which means the same slump can be reached at a lower water content. Pull the water-cement ratio down and you shrink the capillary network directly, producing denser, less permeable concrete rather than just coating the surface. The water reduction also reduces bleeding and drying shrinkage, so there are fewer shrinkage micro-cracks for water to exploit. This is why an integral admixture and a good curing regime together outperform either a rich mix or a surface coat used alone.

Where it is used

• Reinforced roof slabs and terraces where a watertight, crack-resistant deck is required
• Structural and mass concrete such as beams, columns and slabs in water-retaining or moisture-exposed elements
• Underground and overhead water tanks, sumps and reservoirs
• Internal and external cement plaster on brick and block walls to resist rain penetration and rising damp
• Basement retaining walls and rafts subject to soil moisture and hydrostatic pressure
• Repair and renovation concreting and plastering where improved density is wanted
• Foundations and plinth beams in contact with damp ground
• Ready-mix concrete batching where consistent water reduction and workability are needed

Key advantages

• Chloride-free formulation, so it can be used in RCC without risk to embedded reinforcement
• Acts as a water reducer, letting you cut mixing water while holding workability, which lowers permeability at source
• Effective at a very low dosage of about 100g per 50kg cement bag, keeping cost per cubic metre small
• Compatible with all common Portland cements including Portland Slag Cement
• Improves cohesion and finish while reducing drying shrinkage and the cracks that follow
• Reduces rebound loss, useful in plaster and sprayed applications
• Conforms to IS 9103, IS 2645 and ASTM C-494 for specification confidence
• Liquid form disperses evenly through the batch, avoiding the lumping seen with some powder compounds

Limitations & considerations

• It is a mix-integral admixture, not a barrier coat, so it will not bridge existing cracks, honeycombing or construction-joint leaks that need a membrane or injection system
• Waterproofing performance depends on correct water-cement ratio, compaction and curing; a poorly cured slab will still leak
• At the specified low dosage it is a water reducer, not a high-range superplasticiser, so it will not deliver flowing or self-compacting slumps
• Structures under standing water or hydrostatic head usually still need a dedicated membrane or crystalline system in addition
• Trials are advisable before combining it with other admixtures in a specific mix, as interactions can affect setting and workability
• Shelf life is 12 months when stored correctly; material exposed to frost or long sun exposure should be checked before use

Selection & best practice

Specifications

Industry use cases

How we position Sika Plastocrete Super

Within the Sika family, Plastocrete Super sits alongside Plastocrete Plus as an integral waterproofing option; where a project needs a surface waterproofing membrane rather than a mix admixture, look at Sika’s cementitious coatings such as SikaTop Seal 107. For structures under real hydrostatic pressure, pair it with a dedicated membrane or a crystalline system rather than relying on the admixture alone. Across our other brands, comparable integral liquid waterproofers include Dr. Fixit Pidiproof LW+ and MC-Bauchemie’s integral range, while Fosroc’s Conplast line offers a like-for-like alternative for specifiers standardised on that brand. Space Arc Engineering can supply and cross-specify across all of these.

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