National Toxicology Program

National Toxicology Program

Glass Wool Fibers

http://ntp.niehs.nih.gov/go/15206
  • Primary Uses or Exposures: The major uses of glass wool are in thermal, electrical, and acoustical insulation, weatherproofing, and filtration media. In 1980, approximately 80% of the glass wool produced for structural insulation was used in houses. Some glass wool fibers (special purpose fibers) are used for high-efficiency air filtration media, and acid battery separators.
  • Nomination: Glass wool (respirable size) was nominated by North American Insulation Manufacturers Association) for possible removal from the 12th RoC. Glass wool (respirable size is currently listed in the 11th RoC as reasonably anticipated to be a human carcinogen. NIEHS recommended that the nomination be defined as "certain glass wool fibers" because of the considerable differences in the composition of glass wool fibers.
  • Basis for Nomination: IARC1 made different classifications for different types of man-made vitreous fibers. Insulation glass wool fibers were found to be not classifiable as to its carcinogenicity to humans, and special-purpose glass fibers were found to be possibly carcinogenic to humans based on sufficient evidence of carcinogenicity in animals. 

1 International Agency For Research On Cancer (IARC)

The NTP is administratively located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.

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