Fosroc Conplast SD110
A fine-particle dispersing admixture that lets concrete block and paver manufacturers reduce cement content without sacrificing strength.
What is it?
Fosroc Conplast SD110 is a cement-saver, fine-particle dispersing admixture (a water-reducing dispersant) formulated for semi-dry concrete used in concrete and masonry block manufacture. It is a brown liquid that instantly disperses in water. It is NOT a set-accelerator.
Where is it used?
Concrete block, paver and hollow-block manufacturing units across Delhi NCR and Pan-India, where semi-dry mixes are compacted on vibrating block machines and cement economy directly drives unit cost.
Why use it?
It improves cement dispersion and compaction so the same strength is reached with less cement, lowering material cost per block. Alternatively, it lets manufacturers raise strength without adding more cement.
How is it applied?
Dosed into the mix water (or added at the mixer) at a typical 0.40 litres per 100 kg of cement, within a working range of 0.20-0.50 litres per 100 kg cementitious. It disperses instantly, requiring no special equipment.
About Fosroc Conplast SD110
Fosroc Conplast SD110 is a cement-saving admixture engineered specifically for semi-dry concrete used in the manufacture of concrete and masonry blocks, pavers and hollow blocks. Unlike plasticisers designed for flowing structural concrete, SD110 is a fine-particle dispersing agent: when added to the mix water it instantly disperses and breaks up cement agglomerations, so each cement grain is more fully wetted and uniformly distributed through the semi-dry mix. Better dispersion means better particle packing and tighter compaction on the block machine, and that improved compaction is what lets a manufacturer maintain target strength while reducing cement content. Supplied as a brown liquid, it is the partner product to a block plant’s costing exercise rather than to a site pour. For Indian block manufacturers facing volatile cement prices, the value proposition is direct: either cut cement (and therefore material cost per block) without losing strength, or hold cement constant and lift strength to meet a higher grade. SD110 is compatible with all types of Portland cement and is non-toxic, making it straightforward to adopt in existing production lines. Space Arc Engineering, as an authorised Fosroc distributor and applicator serving Delhi NCR and Pan-India, supplies SD110 in 5, 20 and 200 litre containers and can advise on trial dosing for your specific aggregate gradation and cement source. Where a project team is comparing options, established alternatives in the cement-economy and water-reducing space include BASF MasterPozzolith / MasterPolyheed and Sika Plastiment lines; SD110 remains the Fosroc-recommended choice for semi-dry block production specifically.
The technical insight
The mechanism is dispersion, not acceleration. In a semi-dry block mix the water content is deliberately low, which makes cement prone to clumping; un-dispersed cement is effectively wasted because its interior grains never hydrate efficiently. SD110 instantly disperses in the mix water and de-flocculates these cement agglomerations, exposing more grain surface for hydration and improving how fine particles pack between aggregates. The result is denser compaction at the same machine cycle, so the cured block develops its design strength with a lower binder demand. Because the action is physical dispersion and compaction improvement, SD110 does not alter setting time and does not behave like an accelerator. Chloride content is nil to IS:456 and BS:5075, and specific gravity sits at 1.000-1.010 at 27 degrees C, so dosing by volume is predictable. Optimum dosage is always confirmed by site trial because aggregate gradation, fines content and cement type all influence the achievable cement saving.
Where it is used
- Concrete solid block manufacture where cement cost per block is the key economic driver
- Hollow and masonry block production on vibrating block machines using semi-dry mixes
- Concrete paver block manufacturing aiming to hold strength while trimming cement
- Block plants targeting a higher block grade without increasing binder content
- Semi-dry precast units where improved compaction and particle packing are required
- Production lines standardising on all types of Portland cement that need a non-toxic dispersant
Key advantages
- Reduces cement content in block manufacture without loss of strength, directly lowering material cost
- Alternatively increases strength without additional cement for higher-grade blocks
- Instantly disperses in water for easy addition with no special equipment
- Improves cement dispersion and compaction for denser, better-packed blocks
- Chloride nil to IS:456 and BS:5075, suitable where chloride must be avoided
- Compatible with all types of Portland cement and non-toxic
- Available in 5, 20 and 200 litre containers to suit small units and large plants
Limitations & considerations
- Formulated for semi-dry concrete in block manufacture; it is not a general-purpose admixture for flowing structural concrete
- It is a dispersing agent, not a set-accelerator, so it does not reduce setting time or boost early strength like an accelerator
- Optimum dosage and the achievable cement saving must be established by site trial for each mix and cement source
- Performance depends on aggregate gradation and fines; results vary between block plants
- Shelf life is 12 months and stock must be protected from extreme temperatures
- Not intended for cold-weather or rapid-repair concreting applications
Selection & best practice
Establish dosage by trial. Start at the typical 0.40 litres per 100 kg of cement and adjust within the 0.20-0.50 litres per 100 kg cementitious range while testing compacted block strength against your control mix. Add SD110 to the mix water so it disperses fully before contact with cement and aggregate, and keep the water-to-cement relationship consistent so the strength comparison is valid. Decide your objective up front: either lower the cement dose step by step until strength matches the control (cost saving), or hold cement fixed and record the strength gain (grade upgrade). Store containers in shade under normal ambient temperatures, protected from extreme heat or cold, and use within the 12-month shelf life.
Specifications
| Product type | Cement saver / dispersing admixture for semi-dry concrete (concrete blocks) |
| Appearance | Brown liquid (instantly disperses in water) |
| Specific gravity | 1.000 – 1.010 at 27 degrees C |
| Chloride content | Nil to IS:456 and BS:5075 |
| Recommended dosage | 0.40 litres per 100 kg of cement typical (range 0.20-0.50 litres/100 kg cementitious) |
| Cement compatibility | Compatible with all types of Portland cement; non-toxic |
| Packaging | 5, 20 and 200 litre containers |
| Shelf life | 12 months stored under normal ambient temperatures, in shade, protected from extreme temperatures |
| Primary use | Reduce material cost by reducing cement without loss of strength, or increase strength without additional cement, in concrete block manufacture |
Industry use cases
Concrete block manufacturing
Block plants dose SD110 into the mix water to cut cement per block while holding compacted strength, reducing material cost across high-volume production.
Paver block production
Paver manufacturers use the improved dispersion and compaction to maintain strength grades with a leaner binder, protecting margins when cement prices rise.
Hollow and masonry block units
Vibrating-machine units producing semi-dry hollow blocks gain denser particle packing, helping meet strength targets at lower cement content.
Precast block grade upgrade
Producers needing a higher block grade hold cement constant and rely on better compaction from SD110 to lift strength without extra binder cost.
Frequently asked questions
Is Fosroc Conplast SD110 a set-accelerator for cold-weather concrete?
What is the recommended dosage of Conplast SD110?
How does SD110 save cement without reducing strength?
Does SD110 contain chloride?
Which cements is SD110 compatible with, and is it safe to handle?
Can I buy Conplast SD110 in Delhi NCR or elsewhere in India?
How we position Fosroc Conplast SD110
Positioned as Fosroc’s cement-economy admixture for semi-dry concrete block manufacturers, sold through Space Arc Engineering as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India. It targets block, paver and hollow-block production units where reducing cement cost per unit, or upgrading block grade without extra binder, is the priority. Credible alternatives such as BASF MasterPozzolith and Sika Plastiment exist in the broader water-reducing category, but SD110 is the Fosroc-recommended dispersant specifically for semi-dry block production.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.