FIELD: glass materials. SUBSTANCE: glass has, wt.-%: silicon oxide 44.1-48.5; aluminium oxide 7.8-9.9; calcium oxide 4.1-5.2; magnesium oxide 10.8-11.9; titanium oxide 7.7-8.3; sodium oxide 3.1-4.5; zirconium oxide 1.8-2.3; manganese oxide 10.7-12.0; lithium oxide 0.01-2.3; zinc oxide 1.6-2.4, and cobalt oxide 0.001-0.9. Glass properties: microhardness is 810-825 kgf/mm2, height shear at treatment with diamond cut-off disks is 16-18 mcm. Glass is used for production of magnetic heads used in recording equipment and computer engineering. EFFECT: enhanced quality of glass. 2 tbl
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