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A 20-liter furnace test method to determine the combustion gas toxicity of conveyor belts.
Pittsburgh, PA: U.S. Department of Energy, Bureau of Mines, RI 9626, 1996 Jun; :1-10
Experiments were conducted with mine conveyor belt samples in a 20 liter furnace and in a laboratory fire tunnel to measure and compare the major toxic gas concentrations evolved during the combustion of the materials. The toxic gases identified included hydrogen-chloride (7647010) (HCl), hydrogen-cyanide (74908) (HCN), oxides of nitrogen (NOx), and carbon-monoxide (630080) (CO). The toxic gas yields were used to calculate a toxicity index parameter to assess the potential gas toxicity of belt materials during a fire. The toxicity index and the mass loss burning rate values were used to calculate a toxicity hazard parameter to estimate the toxic gas hazard produced by a burning belt in a ventilated system. The study results indicate that polyvinyl-chloride (PVC) belts release higher HCl concentrations due to their higher chlorine content. Styrene-butadiene rubber belts released higher CO, HCN, and NOx concentrations due to their higher carbon and nitrogen contents. The toxic indexes were greater for the PVC belts due to the higher HCl levels produced. The fire tunnel data indicated that the styrene/butadiene rubber belt can burn with higher mass loss rates than the PVC belts, resulting in a potentially higher toxic hazard even though their toxicity index values were lower than those of the PVC belts.
Mining-industry; Mining-equipment; Toxic-gases; Combustion-gases; Combustion-products; Mine-fires; Oxides; Styrene-butadiene-resins; Thermal-decomposition; Underground-mining; Combustible-materials; Fire-assays
7647-01-0; 74-90-8; 10102-44-0; 630-08-0
Report of Investigations
NTIS Accession No.
Pittsburgh, PA: U.S. Department of Energy, RI 9626
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division