Review of the U.S. Navy's Exposure Standard for Manufactured Vitreous Fibers (2000) / Chapter Skim
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Pages 1-6
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The documentation for the MVF occupational exposure standards assists industrial hygienists, occupational medicine physicians, and other Navy health professionals in assessing and controlling the health hazards associated with exposure to these fibers. Occupational exposures might result from such activities as construction, maintenance, operation, and decommissioning of naval ships and facilities.
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The subcommittee reviewed the Navy's supporting documentation regarding sampling techniques, analytical methods, and toxicological and epidemiological studies. In the case of several of those topics, the subcommittee identified data gaps or issues that needed to be more thoroughly addressed by the Navy, including dosimetry and fiber biopersistence.
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The Navy provided little monitoring information on the types of fibers and concentrations associated with naval operations. Manufacturing Processes, Chemical Composition, anc'CIassification The subcommittee determined that the Navy had described the fiber types and their chemical composition appropriately.
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Biopersistence of Vitreous Fibers The ability of vitreous or asbestos fibers to cause disease is based on biopersistence (the time that an intact fiber remains in the lungs, which in turn depends on the fiber's chemical composition and physical dimensions. The subcommittee concluded that the Navy's documentation does not provide an adequate assessment of the role of fiber biopersistence in health effects.
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Such omissions are important because recent animal studies suggest that RCF and other very biopersistent fibers might have carcinogenic potential and therefore might warrant special consideration when an occupational exposure standard for MVF is developed. In addition, the Navy did not present a critical assessment of the limitations of the epidemiological studies.
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Information Gaps anc! Recommendations for Future Research Future research efforts should focus on identifying and monitoring the health effects associated with different fiber types.
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