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[edit] Summary

After the completed test sample has been seated on a ceramic fibre gasket on the top of the furnace, gas is let in through perforated pipes at the bottom of the furnace. The ULC technician is now igniting the gas on each pipe to start the test. Thermocouples are located inside the furnace to make sure the fire endurance test is run in accordance with the prescribed time/temperature curve. Further thermocouples are located on the firestop, 1” or 25mm away from each penetrant and on each penetrant, 1” or 25mm up from the surface of the firestop. The length of time the test is run and/or however long it takes for fire to penetrate the firestop determines the ‘’’F-Rating’’’. The length of time required for a penetrant and/or the sample on average to exceed an average heat rise above ambient at the start of the test to exceed 140°C or 180°C at any single location – this determines the duration for the ‘’’FT Rating’’’ (Fire and Temperature). If the hose-stream test is passed afterwards, the rating can then be expressed as an ‘’’FTH Rating’’’ (Fire, Temperature and Hose-stream). The lowest of the three determines the overall rating, though it is possible to have a wide variety of ‘’’T’’’ results, which can vary depending upn how well each such penetrant conducts heat.

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