List of personal ear protectors and attenuation data compiled from data supplied by the manufacturers of the ear protectors. These data have not been validated by the Physical Agents Branch of the National Institute of Occupational Safety and Health. Standard deviations are not shown in the list, but in most cases such data are obtainable from the manufacturer. Significant variations in effectiveness of individual ear protectors may occur, depending primarily upon proper fitting, proper usage, and mechanical design. Several factors other than attenuation data should be used in selecting ear protectors; for example, comfort, sanitation, and hygienic factors, reliability of performance, durability, and cost.
Noise Section, Division of Laboratories and Criteria Development, National Institute for Occupational Safety and Health, Rockville, Maryland, TR 89, 12 pages