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  Homasote Co.   Structural - Sound Deadening - Insulating Building Products  

Flame Spread Ratings

   

Structural - Sound Deadening - Insulating Building Products

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      In order to evaluate fire safety of a structure, building authorities consider may factors including flame spread ratings. The best known flame spread test is the tunnel test, ASTM E-84. The following table shows the flame spread index for each of the flame spread classifications:

       

      TABLE 1: FLAME SPREAD RATINGS

      Flame Spread Classification

      Flame Spread Index

      Class I (or A)

      0 to 25

      Class II (or B)

      26 to 75

      Class III (or C)

      76 to 200



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