Flame Spread Index

A numerical designation, applied to a building material, which is a comparative measure of the ability of the material to resist flaming combustion over its surface.

ASTM E84, commonly known as the 25-foot tunnel test, measures the rate of flame travel:

Reference

ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials


See also: Smoke Developed.

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Subjects: Civil Engineering