Journal
MATERIALS
Volume 8, Issue 8, Pages 5216-5237Publisher
MDPI
DOI: 10.3390/ma8085216
Keywords
intumescent coatings; char expansion; cone calorimetry; thermal conductivity at high temperatures; durability; mechanical properties
Categories
Funding
- European COST (European Cooperation in Science and Technology) Action [FLARETEX MP1105]
- Engineering and Physical Sciences Research Council [EP/H020675/1] Funding Source: researchfish
- EPSRC [EP/H020675/1] Funding Source: UKRI
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Intumescent coatings are commonly used as passive fire protection systems for steel structures. The purpose of this work is to explore whether these can also be used effectively on glass fibre-reinforced epoxy (GRE) composites, considering the flammability of the composites compared to non-flammable steel substrate. The thermal barrier and reaction-to-fire properties of three commercial intumescent coatings on GRE composites have been studied using a cone calorimeter. Their thermophysical properties in terms of heating rate and/or temperature dependent char expansion ratios and thermal conductivities have been measured and correlated. It has been suggested that these two parameters can be used to design coatings to protect composite laminates of defined thicknesses for specified periods of time. The durability of the coatings to water absorption, peeling, impact, and flexural loading were also studied. A strong adhesion between all types of coatings and the substrate was observed. Water soaking had a little effect on the fire performance of epoxy based coatings. All types of 1 mm thick coatings on GRE helped in retaining similar to 90% of the flexural property after 2 min exposure to 50 kW/m(2) heat flux whereas the uncoated laminate underwent severe delamination and loss in structural integrity after 1 min.
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