| 摘要 |
A spark plug comprises: a center electrode (3); an insulator (2) provided around the center electrode (3); a metal shell (1)provided around the insulator (2); a ground electrode (4) disposed in opposition to the center electrode (3) so as to form a spark discharge gap; and a sealing-material layer (61) comprising a sealing material, wherein the sealing material comprises talc, and the sealing material is filled in a space between the inner face of the metal shell (1) and the outer face of the insulator (2), so as to seal the space, wherein the sealing material has a filling density of 1.5 g/cm3 to 3.0 g/cm3, or the sealing-material layer (61) comprises at least one of an inorganic material and a silicone binder in an amount of 2 to 7 wt %.
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