Weatherability and combustibility of fire-retardant impregnated and surface-coated wood after natural weathering test

概要

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The weatherability and combustibility of fire-retardant-impregnated wood during accelerated weathering for up to 2000 hours or natural weathering for up to 48 months were evaluated. Two types of fire-retardant chemicals (modified polyphosphatic carbamate and guanidine phosphate) were impregnated. The ability of coating to retain fire-retardant chemicals against leaching was also examined using five solvent-born coating systems: [1] penetrating; semi-transparent (brown), [2] thin-film-forming; semi-transparent (brown), [3] film-forming; opaque(white), [4] film-forming; transparent, [5] film-forming; opaque (white). The systems [1] and [2] consisted of 2 or 3-coat application of each single coating composition, whereas [3] and [4] employed specific wood-sealers as an undercoat to stabilize the surface of wood prior to the application of topcoat. The system [5] was a one-coat type. The fire performance of the specimens during weathering depended on the chemical retention, and coating system was effective to maintain chemical retention for a certain period. Specimens impregnated fire-retardant chemical B and finished with coatings [1], [3] and [4] were maintained at a quasi-noncombustible material level after 48-month-natural weathering.