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Our Exolit® solutions for building & construction


Protecting buildings and their beauty

Intumescent coatings are the ideal way to combine fire safety with architectural beauty. Even a thin coat on exposed steel structures provides significant fire retardancy. Long before heat from a fire can dangerously weaken steel, the coating expands into a thick charred layer of insulation.

The ammonium polyphosphate flame retardants of our Exolit® AP line provide key ingredients for treating steel and other substrates with intumescent coatings. Halogen-free, sustainably produced and available in many high-quality grades, they enable cutting edge solutions for modern building safety.

Fire-retardant coatings for steel and other substrates

Our non-halogenated Exolit® AP flame retardants for the building sector take intumescent fire safety to a new level. They enable an extended shelf life of intumescent systems, allow them to be applied in challenging conditions, and even boost their ability to save lives by enabling a faster response and longer resistance to fires compared to intumescent coatings based on standard APPs.

Beyond steel and metal, we also help to protect other substrates, for instance with our special ingredient for transparent intumescent wood coatings. In addition, our Exolit® AP and other Exolit® ranges offer powerful flame retardants for building materials like thermoset resins and thermoplastic compounds.

Find out more about our solutions for building & construction

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Fire safety you don't notice
Clariant Image BuildingConstruction 2020
The one-two-three of better building safety

Exolit® AP is a key ingredient and industry benchmark for protecting steel with intumescent coatings


Halogen-free, non-toxic, phosphorus-based solutions produced with 100% green electricity, of which several carry Clariant’s sustainability label EcoTain®


Products available for water- as well as solvent-based formulations, which can all be easily incorporated during the dispersion stage

Does our expertise go beyond elegantly protecting steel?

»We’re a Swiss specialist for passive fire protection that meets the highest standards in terms of safety and aesthetics. In Exolit® 855 for highly transparent intumescent wood coatings in yachts, planes and similar environments we found an ideal solution for our latest developments.«

Clariant Image Roger_Voemel_V2 2020
Roger Voemel
CEO Microshield AG
The critical numbers of
of heat
can be enough to weaken steel
structures to the point of
Times thicker
insulation foams up on
steel when intumescent
coatings expand
of fire resistance can be
achieved through heat-
insulating effect


  • Exolit® AP 422

    Exolit AP 422 is a fine-particle ammonium polyphosphate (phase II) produced by a special method. The product is largely insoluble in water and completely insoluble in organic solvents. It is colourless, non-hygroscopic and non-flammable. more

  • Exolit® AP 435

    Exolit® AP 435 is a fine-particle ammonium polyphosphate (phase II) optimized for low viscosity in aqueous suspension and intumescent coatings. The product is largely insoluble in water and completely insoluble in organic solvents. It is colourless, non-hygroscopic and non-flammable. more

  • Exolit® AP 418 (TP)

    Halogen-free Exolit AP 418 (TP), especially designed for solvent-based intumescent coatings, offers longer fire resistance time (FRT) compared to conventional solutions by exhibiting an earlier on-set temperature. Therefore, a lower dry film thickness (DFT) for achieving the desired FRT is required compared to standard formulations. In addition, the protection of combustible and heat sensitive substrates is improved. Clariant’s well-known ammonium polyphosphate offers the consistent quality to produce and offer a stable intumescent coating.Exolit AP 418 (TP) is a free flowing white powder with low solubility in water. Additionally, it is completely insoluble in organic solvents. The product is non-hygroscopic and non-flammable. more

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