CAN/CGSB-4.2 No. 27.10-M91

1.1 This method determines the burning behaviour of vertically oriented flame resistant textile fabrics. The specimens tested may be a single layer of fabric or an assembly of two or more layers. 1.2 This method provides two procedures for determining the extent of flame spread. One procedure requires a visual observation of whether or not the flame reaches any edge of the specimen; the other procedure uses a specified force to produce a tear in the damaged area, the length of the tear is reported as the damaged length. Agencies applying this standard may require either or both procedures to be reported.