| 摘要 |
<p>A spark plug 100 is configured such that an insulator 2 is formed of alumina ceramic, and the diameter of a through-hole 6 is not greater than 4 mm as measured at a position where conductive seal materials 16 and 17 are disposed. The coefficient of linear expansion of the conductive seal materials 16 and 17 is adjusted to not greater than 6.5x10<-6>/ DEG C. <IMAGE></p> |
