Phosphorus-Nitrogen Interaction in Fire Retardants and Its Impact on the Chemistry of Treated Wood.

This work focuses on the changes in the chemical composition of wood caused by impregnation with fire retardants such as guanidine carbonate (GC), urea (U), diammonium phosphate (DAP) and their mixtures. The treated wood was tested using the oxygen index (LOI), Py-GC/MS analysis and FTIR Spectroscopy. The wood was vacuum treated at a pressure of 0.