English Abstract

Flame-retardant Effects of Coagents in EPDM Compounds Containing Aluminium Hydroxide Shigeyoshi HAYASHI Sankei Giken Co. Ltd., Kawaguchi, Saitama, Japan Hitoshi NISHIZAWA Nishizawa Technical Institute, Izumi, Yokohama, Japan Hisaya SATO Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan Nippon Gomu Kyokaishi,(2007),80(11),416-421 Original Paper in Japanese Abstract The flame-retardant effects of coagents in EPDM compounds containing aluminium hydroxide were investigated. We evaluated the flame retardancy and mechanical properties of coagents such as carbon black, silica, and silicone compounds, alone and in combination. We found that the addition of 5 phr carbon black to EPDM compounds containing 150 phr aluminium hydroxide resulted in a reinforcing effect and improved flame retardancy, and that a further improvement in flame retardancy could be obtained by adding 5 phr of a silicone compound. The EPDM material containing these two coagents had a heat release rate (HRR) of 185 kW/m2, and combustion residues were 47.5%, which means that the addition of the coagents resulted in a greater residue-creating effect. These results were considered to be due to the synergistic effects of these two coagents. In addition, correlations were observed between the peak HRR and the maximum slope of the TG curve, and between the combustion residues and the TG values at 500 ��, though the peak HRR and the combustion were measured by a cone calorimeter. (Accepted on January 30, 2007) (Received on September 12, 2007) Keywords: EPDM, Aluminum hydroxide, Mechanical Properties, Flame Retardancy, Cone Calorimetry

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