Zirconium core, hoʻohana ʻia no ka nozzle tundish.
ʻO nā hiʻohiʻona nui:
1. ʻO ke kūpaʻa corrosion maikaʻi, ʻaʻohe hoʻonui ʻana i ke anawaena, lōʻihi ke ola o ka lawelawe, ʻaʻohe kahe kahe ʻana, ka mea hoʻopuehu;
2. He maikaʻi ka hana haʻalulu wela, maikaʻi ka hana anti-explosion;