Collection of Silica and Asbestos Aerosols by Respirators at Steady and Cyclic Flow

Details

• Personal Author:
  Brosseau LM ; Ellenbecker, Michael J.
• Description:
  Experiments were described which evaluated the predictive ability of tests using a silica (7631869) aerosol under conditions of steady flow for determining respiratory efficiency. Measurements taken of silica penetration at steady flow were reasonably predictive of silica penetration under cyclic flow. Mass penetration of silica under continuous flow conditions was typically less than 0.1 percent. In general, the penetration of silica under conditions of cyclic flow was about one and a half times as great as that measured under steady flow conditions. However, the same was not true for testing with asbestos (1332214) fibers under steady versus cyclic flow. Furthermore, the potential for exhalation valve failure under cyclic flow was also identified. The authors indicate that these results call for a reevaluation of the current NIOSH protocols for evaluating respirator performance. The authors urge the development of a NIOSH testing method for evaluating the life cycle performance of respirator components such as exhalation valves. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Movements Asbestos Dust Inorganic Chemicals Occupational Health Personal Protective Equipment Respiratory Protective Devices Safety Silicon Dioxide
• Keywords:
  Air-flow Asbestos-dust Asbestos-fibers Electrostatic-filters Filter-materials Mineral-dusts NIOSH-Grant Personal-protective-equipment Respirators Silica-dusts
• Series:
  Grant Final Reports
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  Massachusetts ; OSHA Region 1
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OEP - Office of Extramural Programs
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-33
• NIOSHTIC Number:
  nn:00192326
• NTIS Accession Number:
  PB90-154691
• Citation:
  Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts :1-33
• Contact Point Address:
  Environmental Sci & Physiology Harvard School of Public Hlth 665 Huntington Avenue Boston, MA 02115
• CAS Registry Number:
  Asbestos (CAS RN 1332-21-4) ; Silica (CAS RN 7631-86-9)
• NORA Priority Area:
  Respirators Research
• Performing Organization:
  Harvard University, Boston, Massachusetts
• Peer Reviewed:
  False
• Start Date:
  19860101
• Source Full Name:
  Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts
• End Date:
  19881231
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3b7d9f6d6f0f17af9739adac98872d5db850bcfa6dc0a563faf7ac7e8dbb9e48ff0664e34f91fa053b2b8e8832669574e495239989aedc1520e83d6ac308d449
• Download URL:
  https://stacks.cdc.gov/view/cdc/217775/cdc_217775_DS1.pdf
• File Type:
  [PDF - 862.80 KB ]