Resistor composition for spark plug having a resistor enclosed therein

DETAILED DESCRIPTION In one embodiment of this invention, the invention provides a resistor composition for a resistor useful in a spark plug, the resistor composition comprising (1) 100 parts by weight of (a) a glass; and (b) an inorganic filler; with the glass (a) being present in a proportion of about 30 to about 70% by weight and the inorganic filler (b) being present in a proportion of about 70% to about 30% by weight; and wherein at least about 0.
1% by weight of the inorganic filler (b) is replaced by at least one non-oxide compound; (2) about 0.
5 to about 7 parts by weight of carbon; and (3) 0 to about 20 parts by weight of at least one of a metal oxide, a transition metal carbide, SiC having a low electrical resistivity and B.
sub.
4 C.
In another embodiment of this invention, the invention provides a spark plug including a center electrode; a terminal electrode; an electrically conductive glass positioned between the center electrode and the terminal electrode; and a resistor separating the electrically conductive glass between the center electrode and the terminal electrode wherein the center electrode and the terminal electrode are placed face-to-face in an electrode bore of a porcelain insulator of the spark plug and sealed therein; with the resistor comprising a resistor produced from a resistor composition comprising (1) 100 parts by weight of (a) a glass; and (b) an inorganic filler; with the glass (a) being present in a proportion of about 30 to about 70% by weight and the inorganic filler (b) being present in a proportion of about 70% to about 30% by weight; and wherein at least about 0.
1% by weight of the inorganic filler (b) is replaced by at least one non-oxide compound; (2) about 0.
5 to about 7 parts by weight of carbon; and (3) 0 to about 20 parts by weight of at least one of a metal oxide, a transition metal carbide, SiC having a low electrical resistivity and B.
sub.
4 C.