"Worst-case" aerosol testing parameters: III. Initial penetration of charged and neutralized lead fume and silica dust aerosols through clean, unloaded respirator filters

Details

• Personal Author:
  Moyer, Ernest S. ; Stevens GA
• Description:
  The initial instantaneous count efficiencies were determined for dust and mist (DM); paint, lacquer, and enamel mist (PLEM); and dust, fume, and mist (DFM) respirator filter media against certification silica (14808607) dust and lead (7439921) fume aerosols. A direct comparison was possible with initial count efficiency values using the certification aerosols and the efficiencies measured using the worst case scenario tests. In a second part of the study the effect of aerosol charge on filter initial penetration values by silica dust and lead fume aerosols was examined. For both aerosols the effect of the charge was less than or equal to 5 percent. The aerosol charge effect, however, appears to be larger for silica dust as reflected by the relative differences in the efficiency values. This difference may be due to the generation methods used or to the ability of the one aerosol to maintain a higher charge. The findings demonstrated that the initial count efficiency was significantly affected by the particle size. The percent efficiencies of the filters decreased as particle size was reduced in going from silica dust to lead fumes. Lead fumes are therefore more penetrating and offer a more discriminating test that the silica dust particles. All filter types and flow rates tested revealed lower efficiencies when tested under the worst case aerosol conditions. Substantial differences were noted in the penetration levels at 16 versus 85 liters/minute flow rates. [Description provided by NIOSH]
• Subjects:
  Aerosols Dust Occupational Health Personal Protective Equipment Respiratory Protective Devices Safety
• Keywords:
  Aerosol-particles Equipment-reliability Filter-materials Mineral-dusts NIOSH-Author Personal-protective-equipment Respiratory-protective-equipment Testing-equipment
• ISSN:
  0002-8894
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DSR - Division of Safety Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  271-274
• Volume:
  50
• Issue:
  5
• NIOSHTIC Number:
  nn:00187675
• Citation:
  Am Ind Hyg Assoc J 1989 May; 50(5):271-274
• CAS Registry Number:
  Lead (CAS RN 7439-92-1) ; Quartz (SiO2) (CAS RN 14808-60-7)
• Federal Fiscal Year:
  1989
• Peer Reviewed:
  True
• Source Full Name:
  American Industrial Hygiene Association Journal
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:992b2b93874f12ddb472b7a86a4804ba1e578e39549776f265ac6592892b738bcf66da6c913ae005e86bb4d0fa930746feb18b546199e6f6d3e1db31cf575d3f
• Download URL:
  https://stacks.cdc.gov/view/cdc/203963/cdc_203963_DS1.pdf
• File Type:
  [PDF - 385.21 KB ]