1. SCOPE 1.1 This method of test for flammability characteristics is applicable to certain low
density insulating materials that do not melt or drip during exposure to fire. It is particularly
suitable for use in establishing the Flame Spread Classification for those (bare) foamed plastics
whose flammability assessment by CAN/ULC-S102 or CAN/ULC-S102.2 requires the use of the
rate formula FSC2 = 92.5 d/t but where the necessary parameters ('d' & 't') for use in the formula
are difficult to define as a result of a "Tunnel Test". In the formula FSC2 = 92.5 d/t, 't' is the time
in minutes for the flame front to propagate a distance of 'd' metres where there is a marked
reduction in the advance of the flame front during the tunnel test. 1.2 The purpose of this test is to determine the comparative burning characteristics of
the material under test by exposing the material in a corner wall configuration to a test fire. 1.3 It is the intent of this method to register performance during the period of
exposure and not to determine suitability for use after the test exposure.