| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubrication glass which is for hot extrusion and suppresses formation of inner surface flaws in an extrusion tube during extrusion processing.SOLUTION: A lubrication glass for hot extrusion comprises, in mass%, 47.2-64.8% of SiO, 4.2-11.0% of BO, 8.0-17.6% of AlO, 1.6-3.5% of MgO, 11.0-17.0% of CaO and a combined content of 4.8-9.8% of NaO and KO. The content of NaO and KO is preferably 5.2-9.3 mass%. |
