The results from ignition tests conducted using the Lateral Ignition and Flame spread Test (LIFT) apparatus, Reduced scale Ignition and Flame spread Test (RIFT) apparatus, and ISO 5657 ignitability apparatus from nine different types of New Zealand wood-based products are used to obtain the critical ignition heat flux and thermal inertia using the procedure specified in ASTM E 1321-97a. It is found that vertically oriented samples in the LIFT and RIFT has a higher minimum ignition heat flux compared with the horizontal samples in the ISO 5657 apparatus. There is only a limited agreement between the three test methods for thermal inertia values.
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