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Emission characteristics of the evaporative pattern casting process.

Authors
Gressel-MG; O'Brien-DM; Tenaglia-RD
Source
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
NIOSHTIC No.
00175439
Abstract
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.
Keywords
NIOSH-Author; Field-Study; NIOSH-Survey; Foundries; Foundry-workers; Organic-vapors; Aromatic-hydrocarbons; Region-5; Metal-workers; Polymer-fumes; Industrial-processes; Laboratory-testing
CAS No.
100-42-5; 71-43-2; 108-88-3; 100-41-4; 630-08-0
Publication Date
19870120
Document Type
Field Studies; Control Technology
Fiscal Year
1987
NTIS Accession No.
PB88-162276
NTIS Price
A04
Identifying No.
ECTB-161-04
NIOSH Division
DPSE
Source Name
National Institute for Occupational Safety and Health
State
OH
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