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Homasote Co. Structural - Sound Deadening - Insulating Building Products Flame Spread Ratings

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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