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Fire Technology

, Volume 53, Issue 4, pp 1569–1587 | Cite as

Variation of Intumescent Coatings Revealing Different Modes of Action for Good Protection Performance

  • Michael Morys
  • Bernhard Illerhaus
  • Heinz Sturm
  • Bernhard Schartel
Article

Abstract

Thermal insulation and mechanical resistance play a crucial role for the performance of an intumescent coating. Both properties depend strongly on the morphology and morphological development of the foamed residue. Small amounts (4 wt%) of fiberglass, clay and a copper salt, respectively, are incorporated into an intumescent coating to study their influence on the morphology and performance of the residues. The bench scale fire tests were performed on 75 × 75 × 2 mm3 coated steel plates according to the standard time–temperature curve in the Standard Time Temperature Muffle Furnace+ (STT Mufu+). It provided information about foaming dynamics (expansion rates) and thermal insulation. Adding the copper salt halved the expansion height, whereas the clay and fiberglass change the height of the residue only moderately. The time to reach 500°C was improved by 31% for clay and 15% for the other two fillers. Nondestructive micro computed tomography is used to assess the inner structure of the residues. A transition of the residue from a black, carbonaceous foam with closed cells into an inorganic, residual open cell sponge occurs at high temperatures. This transition is due to a loss of carbon; the change in microstructure is analyzed by scanning electron microscopy. Additional mechanical tests are performed and interpreted with respect to the results of the morphology analysis. Adding clay or copper salt improved the mechanical resistance tested by a factor 4. The additives significantly influence the thickness and foaming dynamics as well as the inner structure of the residues, whereas their influence on insulation performance is moderate. In conclusion, different modes of action are observed to achieve similar insulation performance during the fire test.

Keywords

Intumescence Coating Bench scale fire testing Computed tomography Fire resistance 

Notes

Acknowledgments

The authors are grateful to Dr. Futterer and David García Martínez of Chemische Fabrik Budenheim for providing the intumescent coatings. Michael Schneider and Tobias Kukofka from the BAM workshop are acknowledged for their work in manufacturing the setup. Dr. Andreas Staude and Dr. Dietmar Meinel are acknowledged for their support during the μ-CT measurement.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Michael Morys
    • 1
  • Bernhard Illerhaus
    • 1
  • Heinz Sturm
    • 1
  • Bernhard Schartel
    • 1
  1. 1.Bundesanstalt für Materialforschung und –prüfung (BAM)BerlinGermany

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