BURNING CHARACTERISTICS OF FIRE-RETARDANT-TREATED WOOD UNEVENLY TREATED

Combustible ceilings are typically known to enhance fire growth in a room fire. For wooden linings, impregnating fire-retardant chemicals is popular and simple solution, but there is still a concern that fire safety cannot be assured due to unevenness of the chemical amount inside wood. This unevenness is caused by efflorescence during manufacturing process and their service lives, with fire-retardant chemicals being excess near the surface and less inside the wood. This study evaluated those effect on its heat release and flame spread through cone calorimeter test (ISO5660) and model box test (ISO/TS 17431:2006).