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Review of the U.S. Navy's Exposure Standard for Manufactured Vitreous Fibers (2000) / Chapter Skim
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2 Manufacturing Processes, Chemical Composition, and Classification
Pages 13-17

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From page 13...
... . Subsequent information on exposure monitoring conducted by the Navy, informally received from the Navy Environmental Health Center, indicated that the Navy uses fibrous glass and woo} primarily as insulation and, for continuous fibrous glass, in advanced composite material applications as reinforcement (P.
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From page 14...
... Glass fibers are produced by mixing and melting the raw materials in high temperature furnaces and then processing them with various methods that depend on the end product. A continuous filament process is used for textile fibers, a rotary spray process for glass wool, and a flame attenuation process for making special purpose glass fibers.
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From page 15...
... Nameb 11 A C 21 F G 22 RCF-1 X-607 Insofrax RCF RCF Class Glass Glass Glass Rock Rock Rock Slag RCF sub.C sub.C Components SiO2 Fe2O3 TiO2 A12O3 CaO MgO Na2O K2O B2O2 4.50 4.70 P2O5 0.00 1.10 SO3 0.30 0.03 Cr2O3 0.00 0.00 MnO 0.01 0.00 ZrO2 0.00 0.00 Total 99.40 99.60 63.40 65.00 61.70 46.30 56.30 0.30 0.10 0.06 0.02 3.90 1.90 7.40 7.40 2.80 0.10 0.02 1.00 7.20 2.60 2.90 15.40 16.10 16.10 1.30 0.70 0.60 9.20 1.10 0.20 0.00 0.01 o.oo 100.00 13.20 0.30 2.60 0.10 13.50 3.20 10.00 26.10 9.10 6.40 3.10 3.20 1.40 0.70 0.00 0.00 0.40 2.90 0.00 0.00 0.04 0.00 0.20 0.00 0.00 0.00 99.80 99.10 60.10 38.40 47.70 6.10 0.00 1.00 0.05 0.50 2.10 0.40 10.60 48.00 18.80 38.00 0.07 8.30 9.90 0.08 5.50 0.40 0.00 0.20 0.50 0.20 0.00 0.00 0.01 0.08 0.00 0.10 0.05 1.80 0.00 0.00 0.00 0.03 0.00 0.70 0.00 0.00 0.00 0.10 99.50 100.80 99.40 58.30 76.20 0.10 0.30 0.05 0.08 1.30 1.40 38.70 0.20 0.40 21.50 0.30 0.07 0.1-0 0.10 0.00 0.00 0.40 0.03 0.00 0.00 0.00 0.00 o.oo 0.01 o.oo o.oo 99.30 99.90 a Data derived from Bernstein et al.
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From page 16...
... As with fibrous glass, the manufacturing process produces a range of fiber diameters, including respirable fibers. The addition of urea-phenolic resin produces bonded wool that is typically used for insulation batts, boards, blankets, and pipe covering.
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From page 17...
... The Navy does indicate in the Section "Chemical and Physical Properties" in Marr-Made Vitreous Fibers, that MVF have high melting points, which~make them good candidates for some applications, such as high temperature insulation, but it does not cite any studies on the wearing of these fibers and what happens to them when they are exposed to high temperatures. Since the anticipated exposure of Navy personnel is primarily to worn fibers, the subcommittee believes it would be helpful if the Navy included any relevant references on this topic or indicated that relevant data were not available.
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Key Terms

  • glass wool
  • glass fibers
  • vitreous fibers
  • special purpose
  • slag wool

  • fibrous glass
  • refractory ceramic
  • purpose glass
  • mineral wool
  • discontinuous fibers

  • health center
  • attenuation process
  • navy environmental
  • ceramic fiber
  • flame attenuation

  • fiber diameter
  • average fiber
  • insoluble polymers
  • blown insulation
  • respirable fibers

  • material safety
  • contains fibers
  • purpose fibers
  • personal commun
  • process produces

  • silicon dioxide
  • various applications
  • chemical compositions
  • basaltic rock
  • raw materials


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