Spread of Flame Index (SFI) : That index number for spread of flame which is determined according to the standard test method for measuring the properties of lining materials
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}