To modify the flammability of WPCs fire retardants are added during the compounding process[6]. Halogenatedcompounds based on chlorine and bromine are effective flame retardants. However, halogenated compoundsproduce toxic gases, so they should be avoided. Sainet et. al reported that the 25 % of magnesium hydroxide caneffectively reduce the burning rate of WPCs to 50 % of composite without flame retardant [6]. They also confirmeda marginal reduction in the mechanical properties of the composites with addition of flame retardants. Graciaet. alfound that the addition of fire retardants could lead to self-extinguish materials for polyethylene based compositeswhen ammonium polyphosphate (APP) or aluminium hydroxide were used [7]. Stark et. al evaluated various fireretardants for use in wood flour-polyethylene composites[8]. Based on the investigationmagnesium hydroxide and APP improved the fire performance of WPCs the most in their study.
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