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Song-Yung Wang, Yu-Chen Rao

Structural Performance of Fire-Retardant Treated Plywood: Effect of Elevated Temperature

This paper was designed to investigate the change of bending strength, bonding shear strength and surface fire-retardant (FR) performance of FR treated plywood after accelerated degradation treatment at elevated temperature (77 °C) and medium humidity (50%RH) condition. Furthermore, thermogravimetry analysis (TGA) and differential scanning curves (DSC) analysis were also conducted to explore their thermal degradation. PF-bonded Red meranti (Shorea spp.) and radiata pine (Pinus radiata) plywood, FR chemicals of AF21 and Lee-An 302 were used.

Results indicated that the bending strength and bonding shear strength of non-FR treated and FR treated plywood decreased linearly with the increase of treatment durations. After 80 days of accelerated degradation treatment, the reduction ratio ( %) of bending strength ranged from 6.5% to 33.4% and varied with treatment conditions, whereas 12.8% to 42.3% reduction ratios were observed in bonding shear strength. After subjected to accelerated degradation treatment FR treated plywood could meet the requirement of the third grade FR performance as specified by CNS 6532 standard except those treated with Lee-An 302 FR for 20 days and 40 days. Furthermore, based on TGA, the weight loss of FR treated plywood was found to be less than that of non-FR treated plywoods. After thermal degradation under 100°C, the residual weight of FR treated plywood was higher than that of non-FR treated plywoods.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 53, 09/1999
Pages: 547 - 552

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