Fosroc Conplast WL Xtra
Integral waterproofing liquid admixture based on cement dispersion polymers, conforming to IS:2645-2003, for low-permeability concrete, plaster and mortar.
What is it?
Fosroc Conplast WL Xtra is an integral waterproofing liquid admixture for concrete, plaster and mortars, based on cement dispersion polymers. It is a light-coloured liquid that mixes readily with water and disperses evenly through the mix, conforming to IS:2645-2003.
Where is it used?
Used across RMC and site-batched concrete, precast elements, plaster and mortar where reduced permeability is required — basements, water-retaining structures, foundations, terraces, external renders and infrastructure works throughout Delhi NCR and Pan-India.
Why use it?
It reduces water permeability and water demand while minimising segregation and bleeding, helping produce denser, more durable concrete and mortar without significantly affecting setting time — a recognised IS:2645-2003 waterproofing solution.
How is it applied?
Added at an optimum dosage of 200 ml per 50 kg of cement (0.4 L per 100 kg) during mixing, dispersing evenly into the gauging water. Site trials are recommended to validate performance with local materials.
About Fosroc Conplast WL Xtra
Fosroc Conplast WL Xtra is an integral waterproofing liquid admixture engineered for concrete, plaster and mortars, and it conforms to IS:2645-2003, the Indian Standard governing integral cement waterproofing compounds. As an authorised Fosroc distributor and applicator serving Delhi NCR and Pan-India, Space Arc Engineering supplies Conplast WL Xtra for projects where durable, low-permeability concrete and renders are essential.
Unlike older-generation pore-blocking waterproofers, Conplast WL Xtra is based on cement dispersion polymers. It is a light-coloured liquid that mixes readily with water and disperses evenly throughout the mix. Its waterproofing action works by improving the dispersion of cement and reducing the water demand of the mix — a water reduction that may be as much as 10% or more. By lowering the water-cement ratio and minimising segregation and bleeding, it helps produce a denser, more homogeneous matrix with reduced permeability to water, in line with IS 2645 requirements.
This makes Conplast WL Xtra well suited to the realities of Indian construction — ready-mix concrete (RMC) supplied to large infrastructure sites, precast yards, basement rafts and walls, water-retaining structures, foundations, terrace screeds and external plaster exposed to monsoon-driven water ingress. It is compatible with all cements including pozzolanic (PPC) and slag (PSC) cements widely used across the country, and works with all types of sand, though it must not be used with High Alumina Cement.
Space Arc positions Conplast WL Xtra as a dependable, standards-compliant integral waterproofer within the broader Fosroc Conplast admixture range. Where project specifications call for alternatives, comparable integral waterproofing admixtures are available from brands such as Sika (Sika WT / Plastocrete) and BASF/MBS (MasterLife), but specifying genuine Fosroc product through an authorised channel ensures verified quality, correct dosage guidance and technical support.
The technical insight
The performance of Conplast WL Xtra is rooted in cement dispersion polymer chemistry, not in stearate, silicate or other pore-blocking systems, and it is not a polycarboxylate ether (PCE) or sulphonated-naphthalene (SNF) high-range superplasticiser. The polymers improve cement particle dispersion, which reduces the water needed to achieve a given workability — a reduction that may be as much as 10% or more. A lower water-cement ratio yields a denser microstructure with fewer continuous capillary channels, which is the mechanism behind the reduced permeability to water that conforms to IS 2645. Because it also minimises segregation and bleeding, the hardened concrete or mortar is more uniform and less prone to bleed-water channels that can become leakage paths. The admixture has no significant effect on the setting time of concrete or mortar, and it additionally meets the corrosion-related requirements of the Japanese code JIS Z1535 (modified). Chloride content is as per IS:2645-2003. As with any admixture, dosage should be validated by site trials using the actual cement, sand and water of the project.
Where it is used
- Integral waterproofing of RMC and site-batched structural concrete
- Basement rafts, retaining walls and below-ground structures subject to water pressure
- Water-retaining structures such as tanks, reservoirs and sumps
- Precast concrete elements requiring low permeability
- Foundations and plinth concrete in high-water-table areas
- Terrace screeds and roof slabs exposed to monsoon rainfall
- External cement plaster and render resisting rain-driven water ingress
- Waterproof mortars for masonry and repair work
Key advantages
- Reduces permeability to water in concrete, plaster and mortar, conforming to IS 2645
- Conforms to IS:2645-2003 for integral waterproofing
- Based on cement dispersion polymers — a light-coloured liquid that mixes and disperses readily
- Reduces water demand by as much as 10% or more, lowering the water-cement ratio
- Minimises segregation and bleeding for a denser, more uniform matrix
- No significant effect on setting time of concrete or mortar
- Compatible with all cements including pozzolanic (PPC) and slag (PSC), and all types of sand
- Meets corrosion requirements of JIS Z1535 (modified)
- Long shelf life of minimum 24 months in unopened containers
- Wide range of pack sizes from 200 ml to 200 litre for site and RMC use
Limitations & considerations
- Not compatible with High Alumina Cement
- Optimum dosage is fixed at 200 ml per 50 kg of cement (0.4 L/100 kg); site trials should validate performance with local materials
- An integral admixture — it improves the concrete or mortar itself and is not a substitute for a surface membrane or tanking where positive/negative water pressure design demands one
- Must be dispersed evenly in the gauging water; not to be added neat to dry materials
- Store dry below 50°C; performance depends on correct storage and unopened containers
- Not a high-range superplasticiser (not PCE or SNF) — specify a dedicated plasticiser separately where major water reduction or high workability is required
Selection & best practice
Add Conplast WL Xtra at the optimum dosage of 200 ml per 50 kg of cement (0.4 L per 100 kg of cement), dispersing it evenly into the gauging water rather than adding it neat to dry materials. Always confirm performance with a site trial using the project’s actual cement, sand and water before full-scale use. Do not use with High Alumina Cement. For RMC, coordinate dosing with the batching plant so the admixture is metered accurately into the mix water. Store containers unopened in a dry place below 50°C and use within the 24-month shelf life. Where design requires resistance to standing or pressurised water beyond what an integral admixture provides, combine Conplast WL Xtra with an appropriate Fosroc membrane or tanking system.
Specifications
| Product type | Integral waterproofing liquid admixture for concrete, plaster and mortars |
| Chemical base | Based on cement dispersion polymers |
| Appearance / colour | Light coloured liquid |
| Standards compliance | Conforms to IS:2645-2003 |
| Chloride content | As per IS:2645-2003 |
| Permeability to water | Confirms to IS 2645 |
| Dosage | Optimum 200 ml per 50 kg of cement (= 0.4 L / 100 kg); site trials to validate |
| Compatibility | All cements including pozzolanic and slag, but NOT High Alumina Cement; compatible with all types of sand |
| Setting time | No significant effect on setting time of concrete or mortar |
| Water reduction | May be as much as 10% or more |
| Corrosion resistance | Meets requirements of Japanese code JIS Z1535 (modified) |
| Packaging | 200 ml, 1, 5, 10, 20, 50 and 200 litre containers |
| Shelf life | Minimum 24 months in unopened containers, dry store below 50°C |
Industry use cases
Ready-Mix Concrete (RMC)
Dosed at the batching plant at 0.4 L per 100 kg of cement to deliver low-permeability concrete to infrastructure and building sites, reducing water demand and bleeding while keeping setting times unaffected.
Basements & Below-Ground Structures
Integral waterproofing of rafts and retaining walls in high-water-table areas across Delhi NCR, producing a denser matrix that conforms to IS 2645 permeability requirements.
Water-Retaining Structures
Used in tanks, reservoirs and sumps where reduced permeability and a homogeneous, low-bleed mix are critical to long-term water-tightness.
Precast Concrete
Improves cement dispersion and reduces water-cement ratio in precast elements, supporting durable, dense units compatible with PPC and PSC cements.
Plaster & External Render
Added to cement mortar for external plaster exposed to monsoon rain, helping resist water ingress while remaining compatible with all types of sand.
Foundations & Hot-Weather Concreting
Reduces segregation and bleeding in foundation and plinth concrete; the water-reducing action helps maintain workability and quality in demanding Indian site conditions.
Frequently asked questions
What is Fosroc Conplast WL Xtra based on?
What is the recommended dosage of Conplast WL Xtra?
Which standard does Conplast WL Xtra conform to?
What is the colour and appearance of Conplast WL Xtra?
Is Conplast WL Xtra compatible with all cements?
Does Conplast WL Xtra affect setting time?
What is the chloride content of Conplast WL Xtra?
What pack sizes and shelf life does Conplast WL Xtra have?
How we position Fosroc Conplast WL Xtra
Positioned as Space Arc Engineering’s standards-compliant, Fosroc-genuine integral waterproofing admixture for concrete, plaster and mortar. Lead with Fosroc Conplast WL Xtra (IS:2645-2003, cement dispersion polymer chemistry) for RMC, precast, basements and water-retaining structures across Delhi NCR and Pan-India; name Sika (Sika WT / Plastocrete) and BASF/MBS (MasterLife) only as recognised alternatives when a specification requires comparison.
Related Concrete Admixtures products
Source Fosroc Conplast WL Xtra for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.