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Fire Suppression Substitutes and Alternatives to Halon for U.S. Navy Applications (1997) / Chapter Skim
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APPENDIX C: STABILITY AND MATERIALS COMPATIBILITY OF CANDIDATE REPLACEMENTS FOR HALON
Pages 80-84

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From page 80...
... Table C.1 Agents Examined in the National Institute of Standards and Technology Study Agent Chemical Formula HCFC-22 HCFC-124 HCFC-125 HFC-32/HFC-125 HFC-134a FC-218 HFC-227ea FC-31-10 FC-116 FC-C-318 HFC-236fa Halon 1301 IFC-13I1 CF2HC1 CF3-CHFC1 CF3-CHF2 CF2H2/CF3-CHF2 CF3-CHF2 CF3-CF2-C[3 CF3-CHF-CF3 CF3-CF2-CF2-CF3 CF3-CF3 Cyclo-c4F8 CF3-CH2-CF3 CF3Br CF3I Table C.2 Metals Tested in the National Institute of Standards and Technology Agent Stability Study Metal Major Constituents Typical Use Nitronic-40 (21-6-9 stainless)
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From page 81...
... "Storage at ambient conditions of any of the four agents is feasible, but storage at elevated temperatures for CF3T needs more study." Table C.3 Test Matrix for Harris Study Agent Temperature FC-218 HCFC-125 HFC-227ea CF3I (dry) CF3I with Cu (dry)
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From page 82...
... For elastomers the mechanical properties are compression set resistance, i.e., the tendency to spring back after compression, and elongation reduction in ultimate tensile testing, i.e., the loss of stretchability. These mechanical factors are directly relevant to gasket performance.
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From page 83...
... Two measures are given for each, representing the separate mechanical and sorption methods of characterization. See text.
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From page 84...
... Owing to the short exposure time associated with agent discharge in a fire fighting incident, no significant chemical deterioration of exposed organic materials is expected. A mode of failure called environmental stress cracking does exist, and it may be prudent to conduct specific tests on relevant plastics under stress in the presence of the agent in critical areas such as wire insulation.
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Key Terms

  • bad compatibility
  • alternative agents
  • aircraft engine
  • specific tests
  • compatibility implies

  • mechanical properties
  • wire insulation
  • agent discharge
  • simulated aircraft
  • set resistance

  • machinery spaces
  • dry bays
  • testing materials
  • fire suppressants
  • compression set

  • exposed organic
  • agent vapor
  • metal coupons
  • fire fighting
  • special pub

  • engine nacelles
  • nist special
  • candidate replacement
  • method involved
  • involved measurement

  • cylinder containing
  • outlet closures
  • elastomers emerge
  • lubricants included
  • investigated included


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