1993 年 42 巻 473 号 p. 147-152
Graphite and phenol-formaldehyde resin spheres (GPS) were used in the manufacture of fire resistive and electromagnetic shield composites. The effects of specific gravity, thickness and phenol-for-maldehyde resin content of GPS on the fire resistivity and electromagnetic shield of composites were discussed. The carbonizing temperature of the composites relative to the fire resistive and electromagnetic shielding properties was also discussed. The fire resistivity was tested by a burn-through method, by cutting with an oxygen-acetylene torch and by an oxygen index method in accordance with the Japanese Industrial Standards (JIS) K 7201. The electromagnetic shielding property was tested by a DUAL chamber method in accordance with ASTM ES7-83. The fire resistive and electromagnetic shielding properties of the composites were improved by increasing the specific gravity and thickness of the GPS composites as well as increasing the carbonizing temperature, and reducing the phenol-formaldehyde resin content.