COMPARATIVE-STUDY OF THE EFFECT OF CU2O AND MOO3 ON FLAME RETARDATIONAND SMOKE EMISSION OF PVC BY CONE AND TGA

Cuprous and molybdic oxides exhibit extremely effectiveness in smoke s uppression for PVC. However, few are the data reported concerning flam e retardance and smoke emission of PVG taken from Cone calorimetry rel ative to the conventional thermal analysis technique. Abundant data fr om Cone calorimetry have been acquired. Data analysis was achieved thr ough the study of MLR, HRR, SEA tested at irradiance of 25 kWm(-2). Th e understandable flame retardance of PVC/Cu2O and PVC/MoO3 relative to pure PVC has been rationalized by their lowered heat release rates an d enhanced char residues. The difference in smoke reduction between th ese two oxides consists in the time scale. As clearly seen under air a tmosphere both oxides exert themselves to the afterglow which has been recognized as a dangerous source, in particular in the full-scale fir e situation.