A flammability test based on the UL-94 standard is commonlyapplied to evaluate and classify the fire performance of a material.Therefore, a horizontal burning test and a vertical burning test wasconducted to investigate the effect of fire retardants on the flammability of WPCs. In the horizontal burning test, the sample washeld horizontally and a flame fueled by natural gas was applied tolight one end of sample for 20 s. The height and angle of a flamewith respect to the vertical direction were 10 mm and 30,respectively. The time taken for the flame to reach from the firstreference mark (20 mm from the end) to the second reference mark(80 mm from the end) was measured in this study. A wire sheet washeld 10 mm away from the specimens to consider the effect ofdripping, which is the downward fall of fire source. Prior to the test,the specimens were dried at 80C for 24 h. The tests were conducted at least three times for each specimen.
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