Fosroc Nitoflor HB300 U
A three-part, roller-applied polyurethane sealer coat that hardens the chemical defence of Nitoflor Coving U and PU floor systems in food, dairy and pharma plants.
What is it?
A three-part polyurethane coating that cures to a matt, lightly mottled finish, used as a high-chemical-resistance sealer over Fosroc Nitoflor Coving U mortar and compatible polyurethane floor systems.
Where is it used?
Food and beverage plants, dairies, breweries, pharmaceutical and life-sciences facilities, and any wet-process or chemical-splash area where the coving and floor must resist aggressive acids, alkalis and alcohols.
Why use it?
It seals the porous coving and PU surface against concentrated citric acid, acetic acid (vinegar), lactic acid and common alcohols, giving an easy-to-clean, hygienic skin where standard coatings would be attacked.
How is it applied?
Roller-applied in one or two coats over fully cured, clean Nitoflor Coving U or PU flooring at roughly 15 m2 per 3 kg kit (about 140 micron per coat), within the recommended temperature window.
About Fosroc Nitoflor HB300 U
Fosroc Nitoflor HB300 U is a three-part polyurethane coating engineered as a chemical-resistance sealer for the Fosroc Nitoflor Coving U mortar and the wider Nitoflor U polyurethane-cement flooring family. It is not a primary floor build in itself; rather it is the protective top skin that you apply once the coving and floor are placed, sealing the lightly textured, slightly porous PU surface so that the finished system can stand up to the aggressive chemistry of modern process plants. On curing it forms a matt surface with a characteristic mottled appearance, and it is offered in the standard range of Fosroc colours so that coving, floor and seal can be visually coordinated. In Indian food, dairy and pharmaceutical projects, hygiene auditors and HACCP/GMP consultants increasingly insist that coving and floor junctions be sealed against the very products being handled. Nitoflor HB300 U exists for exactly that demand: it is specified where maximum chemical resistance is required, sitting above the coving mortar to keep acids, vinegars, lactic acid and alcohols from penetrating the substrate. Space Arc Engineering, as an authorised Fosroc distributor and applicator across Delhi NCR and pan-India, positions HB300 U as the finishing layer that turns a good PU coving installation into a genuinely chemical-tight, washdown-ready detail. One honest caveat carried directly from the manufacturer: the coating may yellow over time, but this colour change does not compromise its chemical resistance or mechanical performance, which is why it remains a workhorse sealer where function outranks long-term colour perfection.
The technical insight
The defining feature of Nitoflor HB300 U is that it is a polyurethane (not epoxy) chemistry, which is what gives it its bite against organic acids and alcohols. Concentrated citric acid from fruit processing, spirit vinegar at 50% acetic acid, and lactic acid from dairy fermentation are notoriously aggressive to ordinary epoxy seals; the cross-linked polyurethane network of HB300 U resists these along with common alcohols such as methanol and ethanol. Because it is a thin sealer rather than a structural screed, dosage discipline matters: the published coverage is about 15 m2 per 3 kg kit at roughly 140 micron film thickness per coat, and applying it too thinly leaves pinholes that defeat the chemical barrier, while over-application wastes material and can affect cure. As a three-part product, all three components must be combined in full kits and mixed thoroughly before the pot life expires; part-kit batching is the most common site error and the quickest route to soft or tacky areas. The substrate must be the fully cured, clean and dry Nitoflor Coving U or compatible PU surface; HB300 U is a system component, not a stand-alone primer or floor, and it should never be used over green or contaminated mortar.
Where it is used
- Sealing Nitoflor Coving U coving fillets at floor-to-wall and floor-to-plinth junctions
- Top-sealing polyurethane-cement floor finishes in chemical-splash zones
- Food and beverage production halls handling fruit acids and vinegars
- Dairy and cheese processing areas exposed to lactic acid
- Pharmaceutical and life-science clean and process rooms requiring GMP-grade hygiene
- Breweries, distilleries and bottling lines exposed to alcohols and CIP chemicals
- Bund, tank and containment areas where chemical-tight detailing is mandated
- Wet-process and frequent-washdown areas needing an easy-to-clean, hygienic seal
Key advantages
- Excellent resistance to a wide range of food, dairy and pharma chemicals including concentrated citric acid, 50% acetic acid (spirit vinegar), lactic acid and common alcohols
- Polyurethane chemistry outperforms standard epoxy seals against organic acids and alcohols
- Easy to clean, supporting hygienic washdown and HACCP/GMP regimes
- Simple roller application keeps labour and site disruption low
- Available in standard Fosroc colours for coordinated coving and floor finishes
- Integrates as a matched component of the proven Nitoflor Coving U / Nitoflor U flooring system
- Yellowing over time does not reduce chemical or mechanical performance
Limitations & considerations
- It is a sealer/topcoat, not a stand-alone floor build or primer; it must go over a compatible PU substrate such as Nitoflor Coving U
- May yellow over time, so it is not ideal where long-term colour stability is the priority (a UV-stable aliphatic topcoat suits decorative work better)
- Three-part product must be mixed in full kits within pot life; part-batching causes cure defects
- Application should not start when substrate or ambient temperature is, or will fall, below about 5 degC during application or the tack-free period
- Thin film (around 140 micron/coat) means correct dosage and pinhole-free coverage are critical to the chemical barrier
- Matt mottled finish, not a high-gloss decorative coating
- Substrate must be fully cured, clean and dry; not a remedy for contaminated or under-cured mortar
Selection & best practice
Apply Nitoflor HB300 U only once the Nitoflor Coving U mortar (or compatible PU floor) is fully cured, clean, dry and free of laitance, dust and grease. Keep substrate and ambient temperatures above about 5 degC throughout application and the tack-free period, and avoid application if temperatures are expected to drop. Mix all three components as complete kits, never part-batches, and stir thoroughly to a uniform colour before the pot life runs out. Roller-apply at the recommended rate of roughly 15 m2 per 3 kg kit (about 140 micron per coat); use one or two coats, with two coats preferred where maximum chemical resistance and enhanced colour are required. Maintain a wet edge to avoid lap marks on the mottled finish, and respect Fosroc’s overcoat and full-cure times before exposing the surface to washdown or chemical contact. Always confirm chemical compatibility against the current Fosroc datasheet for the specific reagents, concentrations and temperatures on your site.
Specifications
| Product type | Three-part polyurethane sealer coating |
| Role in system | Chemical-resistance sealer for Nitoflor Coving U / compatible PU flooring |
| Finish | Matt surface with mottled appearance |
| Application method | Roller applied |
| Coverage | Approx. 15 m2 per 3 kg kit |
| Film thickness | Approx. 140 micron per coat |
| Number of coats | One or two (two for maximum chemical resistance) |
| Pack size | 3 kg kit (three-component) |
| Colours | Standard range of Fosroc colours |
| Chemical resistance | Concentrated citric acid, spirit vinegar (50% acetic acid), lactic acid, common alcohols (methanol and ethanol) |
| Minimum application temperature | Approx. 5 degC (substrate and ambient), per system guidance |
| Note on colour | May yellow over time without loss of performance |
Industry use cases
Food & Beverage
Sealing coving and floor junctions in fruit-juice, sauce and pickling plants where concentrated citric and 50% acetic acid (vinegar) attack ordinary epoxy seals.
Dairy Processing
Protecting coving in milk, cheese and yoghurt areas against lactic acid and frequent hot CIP washdowns.
Pharmaceutical & Life Sciences
Providing an easy-to-clean, chemical-tight seal at wall-floor junctions in GMP process and clean rooms.
Breweries & Distilleries
Resisting ethanol, methanol and cleaning chemicals on bottling, fermentation and CIP floors.
Bunds & Containment
Sealing coving in tank, bund and chemical-storage areas where a chemically continuous detail is mandated.
Heavy-Duty Process Areas
Finishing PU-cement floors in engineering and high-traffic process zones exposed to chemical splash and washdown.
Frequently asked questions
Is Fosroc Nitoflor HB300 U a floor coating or a sealer?
Which chemicals does it resist?
What coverage and pack size should I plan for?
Why does the coating yellow, and is that a problem?
How is it applied on site?
Can Space Arc Engineering supply and apply it across India?
How we position Fosroc Nitoflor HB300 U
Nitoflor HB300 U should be specified as a system component, not a stand-alone floor. Its natural partner is Fosroc Nitoflor Coving U, and it complements the broader Nitoflor U polyurethane-cement floor range (for example the Nitoflor SL self-levelling and heavy-duty screed systems), where it seals coving and floor junctions against aggressive chemistry. Where a decorative, colour-stable finish is the priority rather than maximum acid/alcohol resistance, an aliphatic UV-stable topcoat or a Nitoflor epoxy seal coat is a more suitable specification, since HB300 U will yellow. For comparison, contractors evaluating alternatives in the Indian market commonly weigh Sika (Sikafloor PurCem PU-cement systems and matching seal coats), MBCC/Master Builders Solutions (Ucrete-based PU floors with their own sealers), Dr. Fixit (Pidilite) for value-engineered industrial floor coatings, and STP Limited for protective coatings on price-sensitive or general-industrial projects. Within that field, Nitoflor HB300 U earns its place where a project is already built around Fosroc Nitoflor coving and PU flooring and demands proven resistance to citric acid, acetic acid, lactic acid and alcohols in food, dairy and pharma environments. Space Arc Engineering supplies and applies the complete Fosroc system so the seal, coving and floor remain a single warranted, compatible build rather than a mix of vendors.
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