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Abstract
A highly concentrated aqueous solution of sodium polyborate (SPB) was used to treat laminated Japan cedar (Cryptomeria japonica) in order to first develop a fire resistant laminated wood. After the pressure-impregnation of a water borne solution containing 9.78 mol/L of boron, the fire properties were evaluated by cone calorimeter (CCM) and weight loss (WL). The resorcinol formaldehyde resin (RF) laminated wood did not fracture and the adhesive interfaces kept the pieces together even after heating at 750°C for 20 min or with the CCM test using the heat flux of 50 kW/m2 for 20 min. Heat emission for 20 min in the CCM test below 8 MJ/m2 was achieved by a WPG of 53% or more.
The authors are grateful to Messrs. Shingo Sakaguchi and Ryuhei Takehira for SEM measurements and to Messrs. Ken Ozaki, Kyuo Motoh, and Mitsuteru Senda for help in the pressure-impregnation experiments. The wood specimens were supplied by Kagamokuzai Co. Ltd., Japan