Abstract:

In this study, the variation of cedrus tree parts and gypsum during experimental panel manufacturing have been evaluated. The burning pattern on the surface of all test boards produced by adding cedrus’s tree components (wood, bark, cone and needle) as reinforcement fillers to the gypsum structure did not reach the threshold limit of 150 mm that specified in the standard value as ISO 11925-2 standard but only limi-ted spreading of char was observed. It was also found that cone looks like create better barrier against heat compare to needle, wood and bark in similar proportions with gypsum. In contrary, although bark could be absorbed and barrier to heat better than others but it may not support flammability that are not support to mass lost when subject to burning. Some chemical changes occurred in main constituents of lignocellu-losic substances in water/gypsum mixture as evidence with FTIR spectrums. It has also realized that bark (SKa6), cone (Sko6), and needle (SI6) in gypsum negative impact on thermal degradation that higher tempe-rature for decomposition compare to wood-based board (Ska1) at similar experimental manufacturing conditions. It has clearly seen that content of fillers dramatically effects thermal stability of gypsum based boards.

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