Abstract: Through conducting combustion characteristic experiments on high-density polyethylene (HDPE) hollow blow molded folding seats, the combustion characteristics and propagation patterns of seats arranged in different configurations were investigated. Metrics such as heat release rates and seat temperatures were measured, and pertinent parameters, including the fire growth coefficient, were analyzed. The test results indicate that once ignited, HDPE hollow blow molded folding seats with B1 combustion classification reach a maximum combustion temperature of approximately 850 ℃, with a peak heat release rate ranging of 70~132 kW. The fire growth coefficient (α) is approximately 0.001 kW/s2, slightly slower than that of a slow-burning fire. The fire basically does not propagate to seats on either side or to those in the front row or behind row. Observations from the combustion processes of the experiments reveal that HDPE hollow blow molded folding seats melt during combustion, resulting in flowing fire of the dripping plastics. Consequently, for sports venues equipped with HDPE hollow blow molded folding seats, consideration should be given to measures to prevent the spread of fire caused by flowing fire.

Key words: sports venues, high-density polyethylene hollow blow molded folding seat, fire test, combustion characteristics, fire prevention measures