Thermal Degradation of Chemically Treated Shorea parvifolia Plywood

Zaihan Jalaludin, Hashim W.Samsi, Razak Wahab, Aminuddin Mohamad, Puad Elham, Shaharuddin Hashim


Thermal degradation of chemically treated plywood of Shorea parvifolia as the facing material in timber stud partition was investigated. The plywoods were treated with Dricon, Monoammonium Phosphate, Diammonium Phosphate and mixture of Borax and Boric Acid at 20% concentration. The cavity of the partition was filled with fibre insulating material. The fire resistance of the partitions was evaluated using 1.5 m by 1.5 m gas-fired furnace following the standard temperature-time curve set by the British Standard, BS 476 : Part 22:1987. The rating measures the integrity-ability to withstand collapse or sustained flaming and the insulation-ability to prevent excessive increase of temperature. In this study the best fire resistance rating time based on integrity failure was the partition using Shorea parvifolia plywood treated with Dricon (118 min.) followed by Diammonium Phosphate (116 min.), Monoammonium Phosphate (109 min.) and Borax and Boric Acid (97 min.) respectively. The untreated Shorea parvifolia plywood partition shows the weakest fire resistance rating of 95 min.

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