Emission characteristics of the evaporative pattern casting process.

Details

• Personal Author:
  Gressel MG ; O'Brien, Dennis M. ; Tenaglia RD
• Description:
  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.
• Subjects:
  Accidents, Occupational Automobiles Environmental Exposure Epidemiology Hazardous Substances Lung Metals Metal Workers Mortality Occupational Exposure Occupational Health Respiratory System Safety

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• Keywords:
  Aromatic-hydrocarbons Field-Study Foundries Foundry-workers Industrial-processes Laboratory-testing Metal-workers NIOSH-Author NIOSH-Survey Organic-vapors Polymer-fumes Region-5

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• DOI:
  https://doi.org/10.26616/NIOSHECTB16104
• Publisher:
  National Institute for Occupational Safety and Health
• Document Type:
  Text
• Genre:
  Field Studies ; Control Technology
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DPSE - Division of Physical Sciences and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-50
• NIOSHTIC Number:
  nn:00175439
• Citation:
  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
• CAS Registry Number:
  Styrene (CAS RN 100-42-5) ; Benzene (CAS RN 71-43-2) ; Toluene (CAS RN 108-88-3) ; Ethylbenzene (CAS RN 100-41-4) ; Carbon monoxide (CAS RN 630-08-0)
• Federal Fiscal Year:
  1987
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6f885e3900eafdae5711e50563b99d4da5155798e8ff4001022b2fe38ef6c1fe360ed93273f53dc809bc3018c8e49ba57f9039b6b3ae8552464330388b72c0bd
• Download URL:
  https://stacks.cdc.gov/view/cdc/180041/cdc_180041_DS1.pdf
• File Type:
  [PDF - 1.44 MB ]