Fosroc Nitoflor Lithurin
Permanent fluorosilicate-based hardening and dustproofing compound that chemically densifies concrete floors against abrasion, dusting and oil attack.
What is it?
A white, water-soluble crystalline powder based on alkali-metal fluorosilicates and wetting agents that chemically hardens and dustproofs cured concrete and granolithic floors.
Where is it used?
New and old industrial concrete floors, warehouses, light-engineering workshops, car parks, dairies and milk parlours, abattoirs, animal-feed areas, dams, reservoirs, tanks, silos and flues — and as a case-hardener for precast products.
Why use it?
It reacts with free lime inside the concrete to form hard, insoluble crystals, eliminating surface dusting, raising abrasion resistance and reducing penetration of oils, greases and common chemicals — without a film that can peel.
How is it applied?
Dissolve 25 kg in 75 litres of clean water, flood the dry, cured floor with a soft broom at about 1 litre per 6.5 m2 per coat, let it soak up to 2 hours, then wash off surplus while damp. Typically 2-3 coats; dense power-floated slabs need only one.
About Fosroc Nitoflor Lithurin
Fosroc Nitoflor Lithurin is a chemical floor-hardening and dustproofing treatment for concrete, supplied as a white, soluble crystalline powder based on alkali-metal fluorosilicates blended with wetting agents. It belongs to the Nitoflor family of industrial flooring products and is the classic powder-form member of the Lithurin range, alongside the liquid sodium-silicate Nitoflor Lithurin 2, the metallic-silicate Nitoflor Lithurin E, and the water-based liquid hardener Nitoflor Lithurin M.
Unlike a coating that sits on top of the slab, Lithurin works inside it. The powder is dissolved in water and flooded onto a sound, cured concrete surface. Specially selected wetting agents drive the solution deep into the capillary structure, where it reacts with free lime and other soluble particles to form granite-hard, insoluble crystals. The result is a permanently densified, tightly bound surface that resists dusting and abrasion for the life of the floor, rather than a superficial skin that can wear through or delaminate.
For Indian sites, this matters in two ways. First, large-area industrial slabs, warehouse aprons and factory floors generate constant fine cement dust under wheeled and foot traffic; Lithurin chemically locks that free lime away. Second, because the treatment is reactive rather than a build coat, there is no measurable film thickness to manage, no recoat-window adhesion risk, and effectively no maintenance once correctly applied. It is one of the most economical ways to upgrade an ordinary concrete floor into a hard-wearing, low-dust working surface, and it is widely specified by consultants for plants where a full resin screed is not justified.
The technical insight
The active chemistry is a fluorosilicate reaction, not a silicate-gel or polymer film. When the dissolved fluorosilicate penetrates the concrete it reacts with calcium hydroxide (free lime, Ca(OH)2) — the weak, water-soluble by-product of cement hydration that causes surface dusting. This produces insoluble calcium fluoride and silica gel complexes that precipitate within the pore network, blocking capillaries and binding loose particles into a dense, hardened matrix. Because the hardness is generated by an in-situ chemical reaction with the cement matrix itself, the protection is in-depth and bonds integrally to the slab, giving durability against heavy traffic and abrasion that surface coatings cannot match. Practically, this also defines the product’s limits: it needs sufficient free lime and an absorbent, dry, cured surface to react with, so very rich or already-densified slabs react less, and the dissolved solution is toxic and must be neutralised with calcium hydroxide (roughly 2 kg per 10 litres) to pH 7 or above before disposal — it must never enter drains or storm tanks.
Where it is used
- Hardening and dustproofing new and existing concrete industrial floors
- Warehouses, distribution centres and factory aisles subject to wheeled traffic
- Light-engineering workshops and assembly areas
- Dairies, milk parlours, animal-feed plants and abattoirs needing a cleanable, low-dust floor
- Multi-storey and surface car parks
- Dams, reservoirs, water tanks, silos and flues
- Case-hardening of precast concrete products
- Densifying granolithic and power-floated toppings as a single-coat treatment
Key advantages
- Highly durable in-depth hardening that lasts the life of the floor with no re-treatment normally required
- Eliminates surface dusting by chemically locking up free lime
- Improves abrasion resistance against heavy traffic
- Reduces chemical attack and absorbency from oils, greases and common chemicals
- No film or coating to peel, blister or delaminate; nothing to recoat
- Easy to apply with a soft broom — no special equipment or skilled applicators
- Economical, low-cost method of upgrading ordinary concrete floors
- Non-flammable; usable in occupied plants with proper ventilation and PPE
Limitations & considerations
- The dissolved solution is toxic (fluorosilicate) and must never be discharged into drains or storm tanks; surplus must be neutralised with calcium hydroxide to pH 7+ before disposal
- Reacts only with free lime in cementitious surfaces — it does not harden non-cementitious, very rich, or already heavily densified slabs effectively
- Surface must be structurally sound, dry, and free of laitance, oil, grease and existing coatings, or penetration is blocked
- Not a decorative finish, not a waterproofing membrane, and adds no measurable build or anti-slip texture
- New concrete must cure 14 days (coloured/oxide floors 28 days) before treatment
- Metal, glass and paintwork must be protected; splashes removed immediately
- Does not repair cracks, spalls or worn slabs — substrate defects must be made good with a Fosroc repair mortar first
- Dust inhalation during mixing must be avoided; PPE required
Selection & best practice
Treat only sound, dry, fully cured concrete. Repair cracks and holes with a recommended Fosroc repair mortar and let them cure first; degrease oil-contaminated areas with a suitable chemical degreaser, wash with clean water and allow to dry; and mechanically remove all laitance and any existing coating so the solution can penetrate. Allow new slabs to cure 14 days (28 days for coloured floors, with a small trial area first to check colour effect). Dissolve 25 kg of powder in 75 litres of clean water in a plastic container and stir until fully dissolved (metal containers only if the solution is used within 24 hours). Flood the dry floor at about 1 litre per 6.5 m2 using a soft broom, working it well to saturate the surface and prevent ponding. Let it absorb for up to 2 hours and, while still damp, wash off all surplus with clean water — leftover solution drying on the surface leaves a white dusty deposit. Apply 2-3 coats for normal floors (re-apply after 24 hours once dry); dense, power-floated, vacuum-dewatered or granolithic surfaces usually need only one coat. Vacuum up all washings, neutralise with calcium hydroxide to pH 7+ and dispose of per local environmental rules.
Specifications
| Product type | Concrete floor hardener and dustproofer (surface densifier) |
| Chemical base | Alkali-metal fluorosilicates with wetting agents |
| Form / appearance | White, soluble, crystalline powder |
| Mixing ratio | 25 kg powder dissolved in 75 litres of clean water |
| Application rate (solution) | Approx. 1 litre per 6.5 m2 per coat, by soft broom/brush |
| Coverage (powder) | ~13 m2/kg (1 coat), ~10 m2/kg (2 coats), ~7 m2/kg (3 coats) on smooth trowelled finish |
| Number of coats | Typically 2-3; single coat for dense power-floated / granolithic surfaces |
| Recoat interval | 24 hours (surface must be dry before re-application) |
| Soak / dwell time | Up to 2 hours, then wash off surplus while still damp |
| Concrete cure before treatment | 14 days (new), 28 days (coloured floors) |
| Flammability | Non-flammable |
| Pack size | 25 kg polyethylene bags |
| Shelf life | 12 months in dry store, original unopened bags |
| Storage | Cool, dry conditions, original unopened bags |
Industry use cases
Warehousing & logistics
Dustproofing large concrete floor slabs and aprons in distribution centres so palletised and forklift traffic does not raise fine cement dust onto stored goods.
Manufacturing & light engineering
Hardening factory and workshop floors to resist abrasion from trolleys, machinery movement and dropped tooling, extending slab life economically.
Food, dairy & agro-processing
Creating a tightly bound, low-dust, easier-to-clean surface in milk parlours, animal-feed plants and abattoirs where dusting and contamination are unacceptable.
Car parks & infrastructure
Treating multi-storey and surface car-park decks, plus water-retaining structures like reservoirs, tanks and silos, to reduce surface absorbency and wear.
Precast concrete production
Case-hardening precast units to improve surface hardness and handling durability before despatch.
Frequently asked questions
Is Fosroc Nitoflor Lithurin a coating or a penetrating treatment?
How much area does one bag cover?
How many coats are needed?
How long must new concrete cure before treatment?
Does Nitoflor Lithurin make a floor waterproof or chemical-proof?
Is it safe to handle and how is surplus disposed of?
How we position Fosroc Nitoflor Lithurin
Nitoflor Lithurin is Fosroc’s economical, reactive hardener for upgrading plain concrete into a hard-wearing, dust-free industrial floor without the cost or downtime of a resin screed. Within the Fosroc range it sits alongside its sister products: Nitoflor Lithurin 2 (a clear sodium-silicate liquid), Nitoflor Lithurin E (a clear metallic-silicate liquid) and Nitoflor Lithurin M (a water-based liquid hardener with added waterproofing barrier) — the liquids are convenient ready-to-use alternatives where on-site powder dissolving is undesirable. Where a floor needs a decorative, seamless or heavy chemical-duty finish rather than just hardening, step up to a Nitoflor self-levelling epoxy or polyurethane screed, or pair Lithurin with a Fosroc repair mortar (Renderoc / Nitomortar) for substrate make-good. Among credible competitor alternatives commonly available in India, sodium-silicate and lithium-silicate densifiers from Sika (e.g. Sikafloor hardener/densifier range), MYK (formerly MBS/MYK Laticrete) industrial flooring lines, and STP/Pidilite Dr. Fixit surface densifiers serve a similar dustproofing and densifying role; lithium-silicate densifiers in particular are popular where a non-toxic disposal profile is preferred over fluorosilicate chemistry. As an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, Space Arc Engineering supplies genuine Nitoflor Lithurin with batch documentation and can advise whether the powder Lithurin, a liquid Lithurin variant, or a full resin floor is the right and most cost-effective specification for your project.
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