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Emission characteristics of the evaporative pattern casting process.
Gressel MG; O'Brien DM; Tenaglia RD
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, ECTB 161-04, 1987 Jan; :1-50
An attempt was made to identify contaminants produced, to quantify major contaminants, and to determine the temporal nature of these emissions during vaporization of low density polystyrene foam used in the pattern casting process. A sampling hood was used to obtain emissions, which were analyzed for aerosols and specific contaminants. Major gaseous contaminants identified were styrene (100425), benzene (71432), toluene (108883), and ethyl-benzene (100414). The evaporative pattern casting (EPC) molds produced more carbon soot and hydrocarbons during pouring than the green sand, for both iron and aluminum castings. Carbon-monoxide (630080) concentrations were extremely high during pouring and casting removal of the iron castings made with green sand while concentrations with EPC were significantly lower. With either process, carbon-monoxide levels produced during production of aluminum castings were not significant. Benzene was a significant hazard during both pouring and shakeout of iron castings made using the EPC process. Benzene levels during pouring were twice as great with EPC than with the green sand process. It is recommended that further study be given to the use of modified pour cup designs, hollow sprues, high pouring rates, and the use of a vacuum assist to suppress soot emissions from EPC molds.
NIOSH-Author; Field-Study; NIOSH-Survey; Foundries; Foundry-workers; Organic-vapors; Aromatic-hydrocarbons; Region-5; Metal-workers; Polymer-fumes; Industrial-processes; Laboratory-testing
100-42-5; 71-43-2; 108-88-3; 100-41-4; 630-08-0
Field Studies; Control Technology
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division