Abstract
This study investigated the effects of different fire retardant chemicals on surface and thermal properties of veneer sheets. Beech (Fagus orientalis), alder (Alnus glutinosa), poplar (Populus deltoides) and scots pine (Pinus sylvestris) were chosen as wood species and zinc borate, borax, monoammonium phosphate and ammonium sulfate were chosen as fire retardant chemicals. The samples were impregnated by using the immersion method. Some surface properties such as colour measurements and surface roughness of the veneer sheets were conducted according to CIE L*a*b* system. Some thermal properties such as thermal conductivity of the veneer sheets were conducted according to standard and weight loss after combustion was determined by thermogravimetric analysis. Conforming to the results from the study, it was found that fire retardant chemicals increased the thermal conductivity and surface roughness of veneer sheets. Also, thermogravimetric analysis experiments showed that all of the fire retardant chemicals decreased the loss in weights.
Highlights
Wood and wood based panels have long been used as materials in the construction industry because they have a great durability, high strength and versatility (Stevens et al 2006)
Increased surface roughness values of the veneer sheets were obtained after fire retardant treatment
Among the fire retardant chemicals used in the study, boron treated groups exhibited the highest surface roughness values
Summary
Wood and wood based panels have long been used as materials in the construction industry because they have a great durability, high strength and versatility (Stevens et al 2006). Capability and properties of fire retardant chemicals such as being harmless to human, animals, and plants with less release of smoke and toxic gases when burned are important parameters for consumers to select a fire retardant chemical. It was shown the fire retardant chemicals have an effect on other physical, mechanical and some technological properties of the materials treated with them. Inorganic based fire retardant chemicals are extensively used in forest industry because they have both good thermal stability, less release of smoke, less corrosive toxic gases and less strength loss (He et al 2014, Yao et al 2012)
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