Heat Effects on Fire Retardant-Treated Wood

FIRE RETARDANT WOOD has had many decades of commercial application. Over this time a variety of fire retardant formulations have been used; however, most are primarily inorganic phosphates. A newer patented formulation is based on the synergistic combination of an organic phosphate and boric acid [1]. Until the mid-1970’s, the primary criteria for fire retardant treated wood (FRTW) in the United States were fire properties: i.e., flame spread, after glow, etc. In the following decade, new criteria for hygroscopicity were added and design parameters regarding strength loss