FIELD: glass materials. SUBSTANCE: glass has, wt.-%: PbF2 29.27-58.01; B2O3 15.65-19.30; ZnO 0.2-1.0; CdO 0.1-1.5; Bi2O3 23.18-53.38; Al2O3 0.05-4.18; CuO 0.01-1.5; NiO 0.01-0.50. Properties: TCLE, α(10 - 144)·10-7 1/degree, temperature of softening start is 290-358 C, temperature of deformation start is 330-385 C, microhardness is 390-470 C, spreading temperature is 500 C, time of exposition at the spreading temperature up to the appearance of the first symptoms of crystallization is 20-300 min. Glass is used for making of magnetic heads made of ferrites or metallic alloys. EFFECT: increased crystallizing stability. 2 tbl
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