Metallized glass seal resistor compositions and resistor spark plugs

摘要

An electrically stable, radio frequency interference suppressing glass-type resistor seal composition forming a gas-tight seal within the center bore of a ceramic insulator wherein the glass is formed from a mixture, in % by weight, of about 25-50% borosilicate glass and about 50-75% barium borate glass and wherein the metal powder used in the composition consists essentially of a mixture, in parts by weight, of about 1-4 parts antimony and about 2-8 parts silicon. The end portion of the terminal screw positioned within the glass seal may be unroughened for a length of from about 0.065 to about 0.10 inch from the end to preclude breaking of conductivity at the interface of the glass seal with the end portion of the terminal screw.