Flammability Test

For this flammability test, a heat flux of 50 kW/m2 was irradiated to the square samples and measured in the horizontal position. The following parameters were determined during the test: The heat release rate (HRR), peak HRR, time to ignition (TTI), and total weight loss. The time to fire start on the coating surface due to heat radiation is known as the TTI. The following equations were used to calculate the HRR: .

$$q^{\dot{\prime}\prime}(t) = \frac{q(t)}{A\_s} \tag{5}$$

$$\dot{q}(t) = \left(\frac{\Delta h\_{\ell}}{r\_{0}}\right) (1.10) \text{ C} \sqrt{\frac{\Delta P}{T\_{\ell}}} \frac{\left(X\_{O\_{2}}^{o} - X\_{O\_{2}}(t)\right)}{1.105 - 1.5X\_{O\_{2}}(t)}\tag{6}$$

where . *<sup>q</sup>* is the rate of heat release per unit area (kW/m2), . *q* is the HRR (kW), *As*. is the initially exposed area (m2), Δ*hc* is the net heat of combustion (kJ/kg), and *r*<sup>0</sup> is the stoichiometric oxygen/fuel mass ratio (-). The maximum intensity of an HRR curve is determined by peak of heat released rate (PHRR).
