The fire-retardant properties of Nano-Wollastonite (NW) in poplar wood (Populus nigra) were determined in this study. Some physical properties such as water absorption, volumetric swelling and Anti-Swelling Efficiency (ASE) were also measured. Specimens were prepared according to the ISO 11925 standard for the fire-retarding properties, and ASTM D4446-2002 standard for the physical properties. Impregnation of wood specimens with nano-wollastonite was carried out using the Ruping Method (empty-cell process) with a concentration of 10%. Three fire-retarding properties were measured; weight loss, ignition point and fire endurance. The results showed that fire-retarding properties increased in the NW-treated specimens. In addition, the NW-impregnated specimens gained higher dimensional stability. However, the water absorption also increased.

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