| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to technology of silicates and concerns composition of stone casting, used in construction. Stone casting includes the following constituent materials in mass %: SiO2 - 53.0-57.0; Al2O3 - 9.0-11.0; CaO - 8.0-12.0; MgO - 10.0-14.0; FeO - 0.9-1.5; Fe2O3 - 2.3-3.0; Na2O - 1.5-2.5; MnO - 4.0-6.0; SO3 - 0.1-0.2; B2O3 - 1.5-2.5. ^ EFFECT: increase of strength of stone casting. ^ 1 tbl |
