Abstract
Fire behaviors of rubber latex foam under different thickness conditions (d = 1, 2, and 5 cm) were explored by using a self-built small-scale experimental platform. It can be shown that the flame spread menchanism of thermally thin and thermally thick rubber latex foam is different. Rubber latex foam with a thickness of 2 cm shows higher fire risk, whose value of flame spread rate, maximum flame height, maximum mass loss rate, and maximum temperature are 2.93 × 10−3 m/s, 851.88 mm, and 1.83 g/s, 948.00 °C, respectively. On the one hand, this may due to the different mechanisms of flame spread, resulting in different preheating zones on the surface. On the other hand, this may because the thickness of residue formed by thermally thick materials is larger than the thin ones, obstructing the contact of the rubber latex foam with fresh air. In addition, a special phenomenon is noticed during the stage II, where the bottom unburned zone is located in the four edges (thermally thin material) and middle player (thermally thick material).
Highlights
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Three CCD video cameras, placed in the designated place, recorded the whole process of the fire spread, which helped us to clearly observe the three different periods of the natural rubber foam combustion: stage I is the initial combustion phase stage; stage II, the so-called “stable combustion stage”(from the end of initial combustion phases stage to the moment that flame spread to all rubber latex foam surfaces); stage III is the fire decaying stage, which is very similar to the combustion processes of polyurethane foam [21,22,23]
The fire behaviors of thermally thin and thick rubber latex foam shows great difference, such as the law of fire spread rate at samples bottom (Figure 5), flame spread rate (Figure 6), mass loss (Figure 7), flame height (Figure 8), and temperature profile (Figure 9), which is dependent by the difference of fire spread mechanism
Summary
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