Review of the U.S. Navy's Exposure Standard for Manufactured Vitreous Fibers (2000) / Chapter Skim
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1 Introduction
1 Introduction
Pages 7-12
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From page 7... ...
They are also referred to as man-made vitreous fibers, man-made mineral fibers, and synthetic vitreous fibers. MVF are manufactured by melting the raw materials and then forming fibers by several methods, including a drawing process that produces continuous fibers that are used in textiles; a rotary spraying process that produces fibers for insulation; a flame attenuation process that produces specialty fibers such as those used for filtration; a blowing process that is typically used to produce refractory ceramic fibers (RCF)
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From page 8... ...
In light of the asbestos legacy and the absence of a toxicological database on vitreous fibers combined with the latency issue, it is not surprising that concerns have been raised about human health effects related to MVF exposure. Because of the many types of fibers in use in the 1970's, including MVF, a series of studies were conducted to evaluate their pathologic potential.
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From page 9... ...
Until 1984, the Navy based its occupational standard for exposure to fibrous glass dust and vitreous fibers on a grav~metric standard chosen with reference to the then operative Threshold Limit Value (TEV@) of the American Conference of Governmental Industrial Hygienists (ACGTH)
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From page 10... ...
in a laudable desire to keep the exposure of Navy personnel in line with health-protection standards established in other sectors, the Navy adopted a policy of complying with the T-f/cm3 TEV although this value was never formally adopted as the Navy's exposure standard. The Navy noted, however, that the exposure standards and recommendations of ACGIH, the National Institute for Occupational Safety and Health, and other institutions around the world are not strongly supported by quantitative evidence of potential risks, whether associated with cancer or chronic noncancer effects.
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From page 11... ...
The subcommittee subsequently asked the Navy to provide whatever exposure information it had on the nature of exposures of Navy personnel. During the course of the subcommittee's review of the Navy's 1997 documentation, the Navy changed the process by which it adopts an occupational exposure limit.
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From page 12... ...
Specifically, Chapter 2 discusses information on manufacturing processes, chemical composition, and classification of fibers; Chapter 3 assesses data on sampling, analytical methods, and dosimetry; Chapter 4 reviews biopersistence of vitreous fibers; Chapter 5 discusses toxicological studies on MVF; and Chapter 6 addresses the epidemiological studies. Chapter 7 reviews the Navy's approach to selecting an exposure limit and offers recommendations on how the Navy could conduct the kind of scientific evaluation and risk analysis necessary to establish a protective exposure limit.
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