Wegner & Bretschneider
Resistor composition for resistor-incorporated spark plugs
 A resistor composition for spark plugs comprises 100 wt parts of base mixture of 30-70 wt glass frit with the balance being an inorganic aggregate, 0.1-10 wt parts of carbonaceous material calculated as carbon, 0-30 wt parts of stabilizing agent for resistance under load and 0.1-15 wt parts of boron, boric acid and/or a borate. This composition reduces pores on sealing. 
NGK Spark Plug Co., Ltd.
H
H01T
inventional
Yasuhiko Makoto Masao
Suzuki Sugimoto Sakai