Controlled Emissivity Coatings to Delay Ignition of Polyethylene |
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Authors: | Rodolphe Sonnier Laurent Ferry Benjamin Gallard Abderrahim Boudenne Fran?ois Lavaud |
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Institution: | 1.C2MA—Ecole des Mines d’Alès, 6 avenue de Clavières, Alès 30100, France; (L.F.); (B.G.);2.CERTES, Université Paris-Est, Créteil Val de Marne, 61 Avenue du Général de Gaulle, 94010 Créteil cedex, France; ;3.Toyal Europe S.A.S.U., Route de Lescun, 64490 Accous, France; |
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Abstract: | Semi-opaque to opaque films containing small amounts of various aluminium particles to decrease emissivity were easily prepared and coated onto low-density polyethylene (LDPE) sheets. The thermal-radiative properties (reflectivity, transmissivity and absorptivity) of the films were measured and related to the aluminum particles’ content, size and nature. Time-to-ignition of samples was assessed using a cone calorimeter at different heat flux values (35, 50 and 75 kW/m2). The coatings allowed significant ignition delay and, in some cases, changed the material behaviour from thermally thin to thick behaviour. These effects are related both to their emissivity and transmissivity. A lower emissivity, which decreases during the degradation, and a lower transmissivity are the key points to ensure an optimal reaction-to-fire. |
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Keywords: | thermal-radiative properties coating ignition fire protection |
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