Wegner & Bretschneider
Resistor composition for resistor-incorporated spark plugs
 A resistor composition for resistor-incorporated spark plugs, substantially consisting of 100 parts of a base mixture consisting of 30 to 70% of glass frit and the balance of inorganic aggregate; 0.1 to 7.0 parts, calculated on carbon upon sintering, of a carbonaceous material; and 0 to 30 parts of an agent for stabilizing resistance of the resistor under load, the glass frit containing 10 to 100% of lead glass having a PbO content of 30 to 88% and a softening point of 300.degree. to 600.degree. C. with the balance of a glass having a softening point exceeding 500.degree. C., each by weight ratio. 
NGK Spark Plug Co., Ltd.
H
H01T
inventional
Masao Miyakazu Yasuhiko Makoto
Sakai Hashizume Suzuki Sugimoto