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Flame spread or surface burning characteristics rating[1], abbreviation FSI[2] is a rough measure of a material's propensity to burn rapidly and spread flames. It is based on an arbitrary scale in which asbestos-cement board has a value of 0, and red oak wood has 100. US building codes specify maximum flame spread of 25 for insulating partitions installed in exposed locations.[3]

The Life Safety Code groups flame spread ratings into five classes:[4]

Class	rating
A	0-25
B	26-75
C	76-200
D	201-500
E	over 500

The ASTM standard E84 defines a standard test method for surface flame spread and smoke density measurements.[5]

This chemistry-related article is a stub. You can help Wikipedia by expanding it.

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	'''Flame spread''' or '''surface burning characteristics rating'''[http://www.armstrong.com/commclgpac/aus/ep/au/article16755.html], abbreviation FSI[http://www.kydex.com/briefs/143.pdf] is a rough measure of a [[material]]'s propensity to [[burn]] rapidly and spread [[flame]]s. It is based on an arbitrary scale in which [[asbestos-cement]] board has a value of 0, and [[red oak]] wood has 100. [[Building code#United States\|US building codes]] specify maximum flame spread of 25 for insulating partitions installed in exposed locations.[http://www.businessdictionary.com/definition/flame-spread-rating.html]		'''Flame spread''' or '''surface burning characteristics rating'''[http://www.armstrong.com/commclgpac/aus/ep/au/article16755.html], abbreviation '''FSI'''[http://www.kydex.com/briefs/143.pdf] is a rough measure of a [[material]]'s propensity to [[burn]] rapidly and spread [[flame]]s. It is based on an arbitrary scale in which [[asbestos-cement]] board has a value of 0, and [[red oak]] wood has 100. [[Building code#United States\|US building codes]] specify maximum flame spread of 25 for insulating partitions installed in exposed locations.[http://www.businessdictionary.com/definition/flame-spread-rating.html]

	The [[Life Safety Code]] groups flame spread ratings into five classes:[http://www.acousticalsurfaces.com/soundproofing_tips/html/flame_spread.htm]		The [[Life Safety Code]] groups flame spread ratings into five classes:[http://www.acousticalsurfaces.com/soundproofing_tips/html/flame_spread.htm]