What is Flame Resistant Fabric?

The standard test for flame resistance in textiles is a vertical flame test governed by the ASTM specification D6413 Standard Test Method for Flame Resistance of Textiles (Vertical Test) The purpose of this test is to determine whether a fabric will continue to burn after the source of ignition is removed. Using a 12 second Methane flame and a special testing apparatus, afterflame, afterglow and char length are measured. If a fabric exhibits less than 2 seconds afterflame and 6" char length according to the specification, it is "Flame Resistant".

ASTM has substantial influence in the Flame Resistant Clothing industry.  During the time when the Occupational Safety and Health Administration issued 1910.269, the ASTM F-18.65 Sub-Committee on Wearing Apparel was attempting to determine, through scientific means, the thermal hazards that affect utility workers.  Through years of research, the Sub-Committee has released several test methods and standards that quantify the hazards, define protection and further quantify the industry as a whole.