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Each tunnel test will produce a numerical flame spread index (rating), usually 200 or less. The ratings are grouped into classes, labeled from A through C, with Class A being the best with an index of 0-25. The building code dictates what level of flame spread is permitted. For example, if a flame-spread rating of 150, or Class C, is permitted ...
Flame spread. Flame spread, or surface burning characteristics rating, [1] is a ranking derived by laboratory standard test methodology of a material's propensity to burn rapidly and spread flames. There are several standardized methods of determining flame spread,
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Class B flame spread rating 26-75. Class C flame spread rating 76-200. Class D flame spread rating 201-500. Class E flame spread rating over 500. The installation of a complete automatic sprinkler system in structures having these interior finish materials modifies the fire hazard risk. The appendix of the Life Safety Code contains a tabulation ...
Sep 26, 2023 · These metrics are flame spread and smoke development. The flame spread index is a measure of how quickly the flame travels after the fire is initiated. The smoke development rating tells you how much smoke is produced over a period of time. Flame spread index and smoke development are tested in the Steiner Tunnel, a 24 x 24-inch steel box.
Apr 3, 2024 · Flame spread ratings are based on the measure of how quickly and how far flames travel across the surface of a material. This indicates a material’s resistance to fire and its potential to contribute to the spread of flames. Ratings range from Class A (0-25) to Class C (76-200). A Class A Flame Spread Rating indicates superior fire resistance ...
A few species have a flame-spread index slightly less than 75 and qualify as Class B or II materials. The chart below compiles information from various sources and shows flame-spread ratings for some common building materials: Flame-Spread Classification Flame-Spread Rating or Index. Class I (or A) 0 - 25. Class II (or B) 26 - 75.
Flame Spread Index. 76 – 100. Smoke Developed Index. 0 – 450. Exceptions include exposed portions of structural members that meet other requirements, and materials having a thickness less than 0.036 inch (36 mils) applied directly to the surface of walls or ceilings. Standard interior paints and coatings are typically applied to produce dry ...
