prov:value
| - Preferable glasses are multi-component glasses that comprise two or more oxides selected from the group consisting of BaO, CaO, MgO, ZnO, SrO, SiO2, ZrO2, B2O3, Al2O3 and Bi2O3 such as borosilicate glasses, aluminosilicate glasses, boro aluminosilicate glasses, calcium silicate glasses, calcium aluminosilicate glasses, magnesium aluminosilicate glasses, and mixtures thereof.
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