Combustion properties of laminated veneer lumbers bonded with PVAc,PF adhesives and impregnated with some fire retardants

In this study, the effects of impregnation materials di‐ammonium phosphate, aluminium sulphate, potassium carbonate, calcium chloride, zinc chloride on combustion properties of 3 ply laminated veneer lumbers (LVL) produced from Walnut (Juglans regia L.) using phenol–formaldehyde (PF), poly (vinyl acetate) have been investigated. The pressure‐vacuum method was used for impregnation process. Combustion test was performed according to the procedure of ASTM‐E 69 standards. During the test, mass reduction, temperature and released gas (CO, NO_X, SO₂, O₂) were determined every 30 s. As a result, zinc chloride was found to be the most successful fire‐retardant chemical in LVL at PF adhesive. Since it diminishes combustion, the fire retardant of LVL produced from walnut using PF adhesive can be advised. Copyright © 2009 John Wiley & Sons, Ltd.