Study on the potential use of nano-wollastonite to improve the fire resistance and dimensional stability of poplar wood (Populus nigra)

In this study possibility of nano-wollastonite uses for improving fire retardency of poplar wood (Populus nigra) was investigated. Also، water absorption and volumetric swelling of specimens were measured. Specimens for fire resistance were prepared according to ISO 11925 standard and for physical properties ASTM D4446-2002 standard. Specimens were impregnated with nano-wollastonite، using full-cell process. Rate of concentrations were، 4، 6. 3، 10 and 12 percent. Five fire-retarding properties were measured including: weightloss (%)، ignition point (s)، duration of flame after removing the burner (s)، duration of glow after removing the burner (s)، and carbonized area (%). The results showed that fire-retarding properties were increased with the NW-content. Furthermore، the treated wood specimens showed higher dimensional stability.