Abstract
Chung's equations-X, -XII, and -XII were applied to evaluate the fire risk index (FRI) and fire risk rating (FRR) of five wood species. The test specimens used were ginkgo tree, dawn redwood tree, toona tree, lime tree, and walnut tree. A cone calorimeter (ISO 5660-1) was selected and used to test the combustion characteristics of the specimens. The fire performance index-X (FPI-X) and fire growth index-X (FGI-X) calculated using Chung’s equations ranged from 560.59 to 2689.89 s<sup>2</sup>/kW and from 0.0005 to 0.0016 kW/s<sup>2</sup>, respectively. Furthermore, the FPI-XI and FGI-XI varied from 0.49 to 2.35 and from 1.67 to 5.33, respectively. FRI-XII, a FRR, showed that the fire risks of dawn redwood tree and ginkgo tree, at 10.88 (FRR: F) and 10.25 (FRR: F), respectively, were very high. In conclusion, a high FRI-XII value indicates that FPI-X and FPI-XI are low whereas FGI-X and FGI-XI are high.
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