Fosroc Conplast Antifreeze Nordic
Chloride-free, nitrate-based antifreeze admixture that lowers the freezing point of mix water and accelerates set, enabling concrete and mortar placement in sub-zero conditions down to -15°C.
What is it?
A chloride-free, nitrate-based liquid admixture that depresses the freezing point of the mix water and accelerates setting time and early strength, so concrete and mortar can be placed and cured at temperatures down to -15°C without freezing.
Where is it used?
Cold-weather and sub-zero concreting and mortar work — winter site pours, high-altitude and Himalayan projects, cold-store and refrigerated structures, and any job where the mix would otherwise freeze before it gains strength.
Why use it?
It prevents early-age frost damage, keeps hydration progressing in the cold, speeds up set and early strength so formwork can be struck sooner, and being chloride-free it does not promote corrosion of embedded steel.
How is it applied?
Dosed as a clear liquid directly into the mixer along with the gauging water and mixed for roughly 3 minutes; it is never added to dry cement. Trial mixes establish the exact dose for the prevailing temperature and mix design.
About Fosroc Conplast Antifreeze Nordic
Fosroc Conplast Antifreeze Nordic is a cold-weather concreting admixture from the Conplast range, formulated specifically for the low-temperature and sub-zero conditions of Northern and Continental European climates (it is catalogued under Fosroc’s Nordic/Denmark market). It is supplied as a clear liquid that is added to the mix water, where it performs two linked jobs: it depresses the freezing point of the water so the fresh mix resists freezing, and it accelerates the hydration reaction so the concrete sets faster and develops usable early strength before frost can do damage. Crucially, the formulation is chloride-free and nitrate-based, which means it delivers antifreeze and accelerating performance without introducing chloride ions that would attack reinforcement — a major advantage over older calcium-chloride-type winter accelerators.
The product is purpose-made for mortar and pre-mixed (ready-mixed) concrete used in genuinely cold conditions. Fosroc states it allows concrete work to be carried out down to -15°C, with a short mixing time of around 3 minutes, and the admixture is dosed directly into the mixer together with the mixing water. In practical terms, that lets contractors keep pouring through a cold snap, winter season or in chilled environments where an untreated mix would freeze, suffer early-age frost damage and never reach its design strength.
For Indian buyers, it is important to be clear about positioning. “Antifreeze Nordic” is a European-market product within the global Conplast family rather than the standard India-list winter admixture. The closest India-catalogued equivalent is plain Conplast Antifreeze — a brown liquid rated for moderately low temperatures down to about -5°C — which is the product most commonly stocked and specified in India. Where a project in Ladakh, Himachal, Uttarakhand, Sikkim, the North-East or other high-altitude/high-latitude sites genuinely sees temperatures approaching or below -10°C to -15°C, the Nordic-grade chemistry is the relevant reference point, and Space Arc can advise on the correct Fosroc winter-concreting solution and arrange supply.
The technical insight
The chemistry does two things at once. Freezing-point depression: dissolving a nitrate salt in the gauging water lowers the temperature at which that water turns to ice (colligative effect), so the mix stays liquid and workable at temperatures where plain water would freeze and rupture the cement paste. Acceleration: nitrate-based accelerators speed up cement hydration, generating heat and building the calcium-silicate-hydrate structure faster, so the concrete crosses the critical strength threshold (commonly taken as ~5 MPa) before it can be damaged by frost. The chloride-free part matters most for durability — chloride accelerators (like calcium chloride) work but drive reinforcement corrosion, which is why chloride-free nitrate systems have replaced them for any steel-reinforced or prestressed work. The admixture is not a substitute for good cold-weather practice: it does not heat the mix on its own, and on genuinely freezing sites it is used alongside heated mix water/aggregates, insulated formwork and thermal blankets. Adding it to dry cement, or overdosing to “buy” lower temperatures, can cause flash set or strength loss — dosage must be set by trial mix against the actual placing temperature.
Where it is used
- Winter and cold-season concreting where ambient temperatures fall toward or below freezing
- Sub-zero placement of structural concrete and mortar down to approximately -15°C
- High-altitude projects in Ladakh, Himachal Pradesh, Uttarakhand, Sikkim and Arunachal/North-East India
- Ready-mixed (pre-mixed) concrete supplied for cold-weather pours
- Bedding, jointing and repair mortars laid in low-temperature conditions
- Cold-store, refrigerated-warehouse and chilled-process structures
- Reinforced concrete where chloride-free chemistry is mandatory to protect embedded steel
- Night-time and early-morning pours during cold spells to maintain the placing schedule
Key advantages
- Allows concrete and mortar placement in sub-zero conditions, down to about -15°C
- Chloride-free formulation — does not initiate or accelerate corrosion of reinforcement
- Accelerates setting time and early-age strength gain, allowing earlier formwork striking
- Lowers the freezing point of the mix water, protecting fresh concrete from early-age frost damage
- Supplied as a clear liquid, easily dispersed; short mixing time of around 3 minutes
- Simple dosing — added directly into the mixer with the gauging water, no special equipment
- Keeps cold-weather pours on schedule instead of waiting for warmer weather
- Helps the mix reach the critical strength threshold before frost can damage it
Limitations & considerations
- It is an antifreeze/accelerating aid, not a heater — on truly freezing sites it must be combined with heated water/aggregates, insulated formwork and thermal protection
- Primarily a European/Nordic-market product; it is not the standard India-listed winter admixture, so availability and full India datasheet values (pack sizes, SG, IS conformity) should be confirmed before specifying
- Overdosing or adding to dry cement can cause flash set, false set or reduced ultimate strength
- Exact dosage is mix- and temperature-dependent and must be established by trial mixing, not assumed
- Nitrate accelerators speed hydration generally; it does not by itself replace good cold-weather concreting procedure (NDMA/IS 7861 practice, curing, protection)
- Not a waterproofing, plasticising or high-range water-reducing admixture — combine with the appropriate Conplast plasticiser/superplasticiser where workability or water reduction is also needed
- Performance below the stated minimum temperature is not assured and should be referred to Fosroc technical services
Selection & best practice
Always run trial mixes at the expected placing temperature to fix the dose before site use; add Conplast Antifreeze Nordic to the gauging water (or into the mixer with the water), never to dry cement, and mix for the recommended time of about 3 minutes. Treat the admixture as one part of a cold-weather system — combine it with heated mix water and aggregates, insulated or heated formwork and thermal blankets so the concrete reaches its critical strength before being exposed to frost. Keep accurate records of placing temperature and dose, protect the pour until it gains strength, and for any sub-zero or high-altitude job confirm the specific grade, dosage and applicable standard (and India availability vs. standard Conplast Antifreeze) with Fosroc/Space Arc technical support before ordering.
Specifications
| Product type | Antifreeze / set-accelerating concrete and mortar admixture |
| Chemical base | Nitrate-based, chloride-free |
| Primary function | Lowers freezing point of mix water; accelerates set and early strength |
| Appearance / colour | Clear liquid |
| Minimum placing temperature | Down to -15°C (per Fosroc) |
| Mixing time | Approx. 3 minutes |
| Dosing method | Added directly into the mixer with the gauging/mixing water |
| Effect on reinforcement | Chloride-free — does not attack embedded steel |
| Suitable for | Mortar and pre-mixed (ready-mixed) concrete in sub-zero conditions |
| Market / origin | Fosroc Nordic / Denmark catalogue (European cold-climate range) |
| Dosage rate | Mix- and temperature-dependent; establish by trial mix (refer to TDS) |
| Specific gravity | Refer to current Fosroc TDS (not published on product page) |
| Pack sizes | Refer to current Fosroc TDS / local supply |
Industry use cases
High-altitude infrastructure
Roads, bridges and building works in Ladakh, Himachal, Uttarakhand and the North-East where winter and night temperatures drop below freezing and untreated pours would suffer frost damage.
Ready-mix concrete suppliers
RMC plants dosing a chloride-free antifreeze into cold-weather batches so deliveries set and gain early strength on site instead of freezing in transit or during placement.
Cold-storage & refrigerated facilities
Concrete and mortar placed inside or around chilled and sub-zero process environments, where the chloride-free chemistry also protects reinforcement long-term.
Winter building construction
Maintaining slab, column and mortar work through cold spells without losing schedule, used with insulated formwork and thermal blankets.
Repair & jointing mortars
Cold-weather patch repairs, bedding and jointing mortars that must set reliably at low temperature without chloride-driven corrosion risk.
Frequently asked questions
What is Fosroc Conplast Antifreeze Nordic and what does it do?
How low a temperature can it handle?
Does it contain chloride or harm reinforcement?
How is it added to the mix?
Is this the same as the Conplast Antifreeze sold in India?
Does antifreeze admixture replace cold-weather concreting precautions?
How we position Fosroc Conplast Antifreeze Nordic
Within the Fosroc Conplast range, Antifreeze Nordic sits at the cold-climate end alongside the India-list Conplast Antifreeze (brown liquid, to roughly -5°C), which is the more commonly stocked option in India; both are chloride-free winter admixtures, and for most Indian winter pours standard Conplast Antifreeze is the practical specification, with the Nordic grade reserved for genuinely sub-zero high-altitude work. It is frequently paired with a Conplast water-reducer/plasticiser (such as Conplast P211 or a superplasticiser like Conplast SP430) where workability or water reduction is also required, and with Fosroc curing and protection products for cold-weather practice. Credible competing antifreeze/cold-weather and accelerating admixtures available in the Indian market include Sika’s antifreeze and accelerator range (e.g. Sika Antifreeze / SikaRapid / Sika Frostschutz-type products), MBS (Master Builders Solutions, formerly BASF) MasterSet and cold-weather accelerators, Dr. Fixit’s accelerator/winter admixtures, and STP (Sika-owned, formerly Pidilite) accelerating admixtures. Selection should turn on the verified minimum temperature, chloride-free requirement for reinforced work, and confirmed local availability and datasheet values — Space Arc, as an authorised Fosroc distributor and applicator, can advise on the correct grade and supply across Delhi NCR and pan-India.
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