Aerosol penetration characteristics for disposable respirator facepieces

Details

• Personal Author:
  Carpenter DR ; Chen C ; Ruuskanen J ; Sherman A ; Willeke K
• Description:
  The effect of filter material on particle size distribution was studied in a dummy test, and the effect of leakage on particle size distribution was measured with a human test subject. The test aerosol was produced with an ultrasonic atomizing nozzle device from undiluted corn-oil. Penetration measurements of filter material were made by mounting a mask on a filter holder in the chamber and measuring inside and outside concentrations. Measurements were made for six different suction flow rates. The mask was totally sealed in these measurements. In the human study test, the test subject breathed through the nose and sat inside the chamber without moving his head or changing facial expressions. Sampling was then performed in three conditions: the sealed case, in normal use, and in normal use with an artificial leak. In the filter material test, the penetration was influenced by suction flow rate. The results indicated an increase in penetration with increasing suction flow rate. Diffusion was the dominant force in the filtration with interception and sedimentation mechanisms being less important and impaction having only a minor role due to the low velocities used. In studying the different leakage rates, the results indicated that penetration of aerosols varied quite little with leak conditions for particles having physical diameters less than 1 micrometer. In the size range larger than 1 micrometer, the penetration indicated a different size dependent effect between the sealed mask and the mask in normal use. Larger particles were able to enter through facial leaks. [Description provided by NIOSH]
• Subjects:
  Aerosols Dust Environmental Monitoring Occupational Health Particulate Matter Personal Protective Equipment Respiratory Protective Devices Safety
• Keywords:
  Aerosol-particles Air-quality-monitoring Air-sampling-equipment Air-sampling-techniques Dust-control NIOSH-Grant NIOSH-Publication Particulate-dust Personal-protective-equipment Respiratory-protective-equipment
• ISSN:
  0021-8502
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  19
• Issue:
  7
• NIOSHTIC Number:
  nn:00191153
• Citation:
  J Aerosol Sci 1988 Jan; 19(7):1445-1448
• Contact Point Address:
  Environmental Health University of Cincinnati Dept of Environmental Health Cincinnati, Ohio 45267
• Federal Fiscal Year:
  1988
• Performing Organization:
  University of Cincinnati, Cincinnati, Ohio
• Peer Reviewed:
  True
• Start Date:
  19810701
• Source Full Name:
  Journal of Aerosol Science
• End Date:
  19920831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:639659400a21ed717c01663dce1008cb66764e6e61d075a440f653faeccb875f22325f5a01f647acdd8e9a6125aaf0482ecfe420837a62bf8337734748e840ad
• Download URL:
  https://stacks.cdc.gov/view/cdc/204088/cdc_204088_DS1.pdf
• File Type:
  [PDF - 186.60 KB ]