Glass/glass ceramic used for preparation of molded product for substrate for magnetic storage medium e.g. high-density recording hard drive, comprises specified amount of silica, alumina, magnesium oxide and titanium dioxide

摘要

Glass/glass ceramic comprises (in weight%) silica (37.5-57.5), alumina (22.5-37.5), magnesium oxide (9.5-18.5), and titanium dioxide (2.5-10). The ratio of alumina and magnesium oxide is 1:1-1:2.25. Independent claims are included for the following: (1) molded product; and (2) preparation of molded product.