FIELD: chemistry.
SUBSTANCE: glass comprises the following in wt %: SiO2 15.0-22.0; B2O3 8.0-12.0; Al2O3 8.5-14.5; PbO 40.0-48.0; ZrO2 3.0-4.0; ZnO 2.0-5.0; CuO 0.1-1.0; BeO 1.0-2.0; MgO 5.0-10.0.
EFFECT: increased flowing temperature of glass.
1 tbl
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|
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