nC® ProTherm CUI-XF

nC® ProTherm CUI-XF thermal insulating coating


Based on sol-gel nanotechnology, the nC ProTherm CUI-XF coating system is designed for thermal insulation, Safe Touch and corrosion passivation. CUI-XF has a long lasting lifetime cycle of more than 20 years outdoors, and life-long expectancy indoors.


Because of the ability to insulate with a very thin layer of coating, nC ProTherm CUI-XF offers space saving and cost reducing protection at a high degree of insulation. Thermal conductivity = λ10 mW/(m·K) 56 and Thermal resistance = R10 m2K/W 0.2409 at 10mm, at a lightweight density of 500 gr/m³.  


It provides Safe Touch surfaces and is capable of reducing surface temperatures of for instance steampipes from 150°C down to 50°C and below. CUI-XF is hydrophobic, corrosion passivating and chemical resistant. It keeps heat and cold in place.


In order to prevent CUI (Corrosion Under Insulation), the nC ProTherm CUI-XF coating is equipped with a corrosion passivating primer. The primer surpasses any corrosion protection coating available as it is based on surface bonding nanotechnology (sol-gel). The system will prevent metals from corroding. It will stop already present corrosion.


Both new or blasted metals, as well as already corroded metals (ferro or non-ferro) benefit from this treatment, without the need for chipping or blasting beforehand. This makes it a very fast, cost-effective and environment friendly solution. Because of the chemical bonding, the coating withstands shockloads and heavy chemicals.


The covalent bond offers a flexible protection as it will shrink and expand along with the metal during ambient and internal temperature changes. This way the coating will not crack or release from the surface, as mechanically adhered coatings do. The layer itself offers the look-and-feel of a hard-coat. Both metal and coating are now immune for elevated temperatures, salt, water, chemicals or oxygen. As the coating bonds with the metal, it builds a matrix inside the metal surface and withstands abrasion as never seen before. The coating will protect metals against corrosion for more than 20 years.


Because nC® ProTherm CUI-XF is fire resistant, it will protect the integrity of the structures it is applied on against melting down for a very long period of time. This period varies between 8 hours and 48 hours depending on the severity of the fire and the thickness of the coating applied.  


nC® ProTherm CUI-XF is applied by spraygun as it keeps the coating airy, thus improving the insulating capacities. It shows a stucco-like finish. If applied by brush, roller or knife, the end result will show a rough surface.  nC® ProTherm CUI-XF can be applied in one layer, between 3mm up to 12 mm and is a fast drying solution. nC® ProTherm CUI-XF is available in off white. Available in all colours if ordered in quantities above 140 kg. 




  • Thermal conductivity = λ10 mW/(m·K) 56 at 10 mm coat
  • Thermal resistance = R10 m2K/W 0.2409 at 10mm coat
  • Low weight 0,50 gr/m³
  • Bonds into and with surface chemically, not mechanically
  • Low consumption 1350 gr/m² WFT
  • Performs in temperatures of -90°C up to 150°C
  • Passivates metal and rust
  • Chemical resistant
  • against progressing corrosion
  • Low VOC
  • No hazardous fumes



  • Establishes thermal insulation, acoustic insulation, fire retardancy and corrosion protection in one
  • Apply by spraygun
  • Application by brush or roller for rough surface
  • One layer application between 3mm up to 12mm
  • For indoor and outdoor use
  • No spray mist or overspray
  • Fast drying
  • Suits all metals
  • Space saving
  • +20 y of service outdoors
  • All colours available
  • Can be painted over



  • 25% up to 35% less energy cost
  • 50% up to 70% less application/project cost
  • Low cost per m²
  • First-time-right product, fast application, low impact
  • Easy to repair, no extra cladding cost
  • Very long service time



Measured through FLIR equipment, the boiler shows the surface temperature reduction with a 6mm coat after 12 hours since application.


Chart 1: Measured values through Lola 5 (red) and heatingwire HW (green) for thermal conductivity.


Values taken from report ZAE Bayern, Germany (Centre for Applied Energyresearch). Chart translates as:

  • Lambda value λ (w/mK) = 0.045
  • U Value = 0,75 W/m²K


  • Suitable for indoor and outdoor surfaces.
  • Apply on stone, concrete, wood, rooftiles or gypsum only.
  • nC® ProTherm CUI-XF operates on surface temperatures ranging from -50° C up to 120° C.
  • A nC® ProTherm CUI-XF coat can withstand surface temperatures of up to 150° C for short periods of time.
  • Never expose a nC® ProTherm CUI-XF coat to surface temperatures of more than 150° C.
  • During preparing and application of nC® ProTherm CUI-XF, use safety glasses. Protect hands and skin from exposure using gloves and use appropriate clothing.
  • Although free from solvents, please ensure adequate ventilation, especially when spraying.
  • Substrate must be free from grease, dirt or dust.
  • Substrate temperature must be between 4° C and 75° C.
  • Ambient temperature must be between 4° C and 35° C.
  • Do not apply when ambient humidity exceeds 90%.
  • Mix dry component A 12% weight to resin component B 88% weight. Use (industrial) mixer.
  • Mix for at least 5 minutes.
  • Do NOT use any thinner.
  • To get a rough surface: Use brush, roller or knife.
  • For a smooth surface finish use airgun/spraygun suitable for low viscosity stucco for application.
  • Vary one-coat film thickness from between 3mm to max. 12mm WFT.
  • DFT >3mm, <6mm for Safe Touch purposes.
  • DFT >5mm, < 19mm for thermal insulation purposes.
  • Cross layer-application is recommended, wet-in-wet.
  • In case of rolling a rough surface will appear. If a smooth surface is required, please wet the finished surface with a low volume water mist sprayer (not a garden hose) and move a wet metal profile of about 120 cms long over the surface to make it smooth.  
  • Measure WFT during application. Product expands up from between 5% to 15% during application.
  • nC ProTherm CUI-XF will decrease 10% in thickness during curing time.



All metals, indoor

12 hours, forced drying after 6 hours drying allowed at 55° C max.

All metals, outdoor

24 hours, forced drying after 6 hours drying allowed at 55° C max.

Curing time after which product can be exposed to full rain

12 hours

  • Let surface dry in for at least 6 hours before forced drying by means of blower or heater at 55° C max.
  • Surface can be painted over.
  • Clean brushes, rollers, nozzles with water immediately after any stop.
  • Wash hands and face after every stop.


  • Do not use as a final floor covering.
  • Apply on surfaces that reach temperatures between -90°C up to 150°C only.
  • In case of long-term submersion, only install in combination with nC ProTherm H2O finish.
  • Do not install over poor surfaces, such as those with flaking paint, grease or other contaminates.
  • Do not allow application during freezing temperatures.
  • Do not rely on visual measurement for coating thickness. Always use a wet film thickness (WFT) and/or dry film thickness (DFT) gauge in several areas to ensure proper application thickness.


  • Never use pressure to empty drums.
  • Dispose of contents/container in accordance with local/regional/national/international regulations.
  • nC ProTherm CUI-XF has a shelf life of 1 year.
  • Store nC ProTherm CUI-XF between temperatures of 5° Celsius and 35° Celsius.
  • nC ProTherm CUI-X is available in 4 kg, 10 kg, 20 kg, 65 kg or 350 kg packaging.
  • Delivery time 1 to 3 weeks
  • UN number: None assigned.
  • UN proper shipping name: None assigned.
  • Transport hazard class(es): None assigned. Product is suitable for air transport.
  • Packing group: None assigned.
  • Environmental hazards: No known environmental hazards.
  • Special precautions for user(s): No known precautions for transport.
  • It is advised to avoid freezing product.
  • Guidance on transport in bulk: Transport in bulk according to Annex II of MARPOL 73/78 and the International Bulk Chemical Code (IBC code).


  • Appearance after mixing: White yoghurt, thixotropic
  • Odour: Acrylic
  • % Solids: 72%
  • Solvents: None, water 25,85%
  • Density 0,3 g/cm³
  • pH-Value 11 - 12
  • Shore Hardness A = 30 – 40
  • Boilingpoint 100° Celsius
  • Flashpoint 300° Celsius
  • Vapour pressure at 20° Celsius: 23 hPa
  • VOC IE 2010/75 EU: 2,4% (32,4 g/l)

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