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Home / Products & Industries / Flame Retardants / Industry Overview / Flame Retardants for Building and Construction
Industry Overview
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Our Exolit™ solutions for building & construction -
modern intumescent fire protection you can build on

Protecting buildings and their beauty with halogen-free intumescent coatings

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

  • Melamine-free APP flame retardants
    Mehr
  • Flyer
    Flyer Exolit AP 422 A for PIR insulation panels and epoxy composites 202409 EN
    Download
  • Video
    Webinar on Clariant’s new Exolit™ solutions for fire-protective water- and solvent-borne coatings with Dr. Andreas Termath.
    Abspielen
  • Flyer
    Flyer Exolit AP 418 for solvent-based intumescent coatings 202403 EN
    Download
  • Brochure
    Brochure Exolit for intumescent coatings 202507 EN
    Download
  • Brochure
    Brochure Exolit Overview 202603 EN
    Download

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Fire safety you don't notice until you need it

Graph showing how fast steel reaches a critical temperature of five hundred degrees Celsius without an intumescent coating

The one-two-three of better building safety key benefits of our flame retardants

1.

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

2.

Halogen-free, non-toxic, phosphorus-based solutions produced with 100% green electricity

3.

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? Roger Voemel definitely thinks so

»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.«

Portrait of Roger Voemel from Microshield.
Roger Voemel
CEO Microshield AG

The critical numbers of intumescent safety

°C
of heat
can be enough to weaken steel
structures to the point of
collapse
Times thicker
insulation foams up on
steel when intumescent
coatings expand
Minutes
of fire resistance can be
achieved through heat-
insulating effect

Constructive solutions for safer buildings

  • Exolit™ AP 422 A
    Exolit AP 422 A is a fine-particle ammonium polyphosphate (phase II) with less than 0.1% melamine. The product is largely insoluble in water and completely insoluble in organic solvents. It is colorless, non-hygroscopic, non-flammable, and classified as SVHC-free under current regulations.
    SAMPLE | SDS | DOWNLOADS
  • 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 colorless, non-hygroscopic and non-flammable.
    SAMPLE | SDS | DOWNLOADS
  • Exolit™ AP 435
    Exolit AP 435 is a fine-particle phase II ammonium polyphosphate that contains less than 0.1% melamine. It is designed to provide low viscosity in aqueous suspensions and intumescent coating formulations. The product is largely insoluble in water and completely insoluble in organic solvents. It is colorless, non-hygroscopic, and non-flammable.
    SAMPLE | SDS | DOWNLOADS
  • 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.
    SAMPLE | SDS | DOWNLOADS

Find out more about our solutions for other industries

  • Electrical & Electronics
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  • Transportation
    Mehr
  • Industrial Applications
    Mehr
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