Overview of WBGT Clothing Adjustments Factors

Details

• Personal Author:
  Ashley CD ; Bernard, Thomas E.
• Description:
  WBGT (wet bulb globe temperature) is a common index of the environment used to assess occupational exposures to heat stress. Occupational exposure limits use a threshold based on the internal heat generation represented by metabolic rate assuming a standard work uniform. Other clothing ensembles may change the effective environment to which the worker is exposed, and for this reason Clothing Adjustment Factors (CAFs) were introduced. A progressive heat stress protocol can be used to estimate CAFs. This paper discusses the progressive heat stress protocol, CAFs for a range of clothing ensembles and environmental, work, and clothing properties that affect the CAF. A summary of the work performed at the University of South Florida over the past 10 years is the basis for the presentation. While work demands and respirators have little influence, high vapor resistance interacts strongly with humidity level; porosity (ability to support convective air movement) is a better indicator of performance than MVTR; and layering has an intermediate effect than the sum of the layers. Early indications are that apparent and resultant evaporative resistance can be used to predict the CAF of an ensemble. [Description provided by NIOSH]
• Subjects:
  Environmental Exposure Heat Stress Disorders Hot Temperature Humidity Occupational Health Risk Assessment Risk Factors Safety Solvents Temperature
• Keywords:
  Clothing Environmental Exposure Exposure Levels Heat Heat Exposure Heat Stress Metabolic Rate Risk Factors Temperature Effects Temperature Regulation Thermal Effects Thermal Properties Thermal Reactions Threshold Limit Values TLV Vapors

  More +
• Publisher:
  Japanese Society of Human-Environment System
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  Florida ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  11
• NIOSHTIC Number:
  nn:20062988
• Citation:
  The Fourth International Conference on Human-Environment System, ICHES2011, October 3-6, 2011, Sapporo, Japan. Fukuoka, Japan: Japanese Society of Human-Environment System, 2011 Oct; :11
• Email:
  tbernard@health.usf.edu
• Federal Fiscal Year:
  2012
• Performing Organization:
  Sunshine Education and Research Center, University of South Florida
• Peer Reviewed:
  False
• Start Date:
  20050701
• Source Full Name:
  The Fourth International Conference on Human-Environment System, ICHES2011, October 3-6, 2011, Sapporo, Japan
• End Date:
  20290630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:143d3ccea595262a219c67e5d1a8e7c263e6a02ef2a9a04e0b18131cf0e630aa5549e4de73b01077f8a8d7d01ba110fbb270b540ba8096d98607109badd7c7ac
• Download URL:
  https://stacks.cdc.gov/view/cdc/226131/cdc_226131_DS1.pdf
• File Type:
  [PDF - 77.62 KB ]