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THE EFFECTS OF SOME FIRE RETARDANTS ON PHYSICAL AND MECHANICAL PROPERTIES OF HDF PANELS COVERED WİTH RESIN-IMPREGNATED PAPER

Ferhat Özdemir

Abstract


The objective of this study is to determine the effects of some fire retardants on physical and mechanical properties of the high density fiberboard (HDF) panels covered with resin-impregnated paper. Fire retardant (FR) chemicals borax (BX), boric acid (BA), ammonium polyphosphate (APP) and alpha-x (AX) were added as powder into the fibers made from 50% pine and 50% beech woods at 3%, 6% and 9% levels based on oven-dry fiber weight. HDF panels were produced (400x400x6.5mm). Surfaces of HDF panels were coated with resin- impregnated papers. The physical and mechanical properties of panels were investigated. The results showed that the addition of FR chemicals increased thickness swelling and water absorption of the panels. However modulus of rapture (MOR), modulus of elasticity (MOE), and internal bond (IB) strength decreased with increasing FR chemicals in the experimental panels. Thus, it was ascertained that concentration and type of FR chemicals are effective on the physical and mechanical properties of HDF boards covered with resin-impregnated papers.

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