CAN/ULC-S114 STANDARD METHOD OF TEST FOR DETERMINATION OF NON-COMBUSTIBILITY IN BUILDING MATERIALS

1. SCOPE
1.1 This Standard provides a means of determining the non-combustible nature of elementary building materials. It shall be applied to materials used in the construction of buildings. It does not apply to materials with a decorative or protective coating, or impregnation, or built up of laminations of dissimilar materials. (Adhesives between laminations shall be
considered laminations.)

2. APPARATUS
2.1 The test shall be carried out in the furnace detailed in Figures 1 to 5 inclusive.
This furnace shall be heated by passing an electric current from a suitably regulated source through the nickel-chrome resistance wire surrounding the heating tube. The electric current may be adjusted by means of a variable voltage transformer.

2.2 Temperatures in the furnace shall be determined by two chromel-alumel thermocouples. The controlling thermocouple T2, situated at the level of the centre of the specimen and 9.5 mm from the wall of the heating tube, shall be used when stabilizing the furnace temperature prior to test; the indicating thermocouple T1, situated above the specimen and 6.4 mm inside the gas vent, shall be used to measure the temperature rise during the combustion of the specimen. The wires of both thermocouples shall have a diameter not greater than 1 mm and that portion of their length which protrudes inside the combustion chamber shall be bared. For the measurement of temperatures, preference should be given to
an automatic recording device.

2.3 A mirror may be used to make visual observations of the specimen during the test.