The present invention relates to a glass composition that includes: 57 to 75 percent by weight of SiO2; 3 to 11 percent by weight of Al2O3; 6 to 11 percent by weight of Na2O; 16 to 21 percent by weight of CaO; 0.01 to 0.1 percent by weight of Li2O; and less than 0.05 percent by weight of K2O. Each percent by weight is based on total weight of the glass composition. Glass products are also provided that have a bulk glass composition as described above. The glass products, such as flat glass products and glass substrates, have a strain point of at least 590° C. and a thermal expansion of at least 7.4 ppm/° C. The present invention also relates to magnetic recording articles and photovoltaic cells that include a glass substrate that has a bulk glass composition as described above.
申请公布号
US2014144498(A1)
申请公布日期
2014.05.29
申请号
US201213687091
申请日期
2012.11.28
申请人
PPG INDUSTRIES OHIO, INC.
发明人
SHELESTAK LARRY J.;MCCAMY JAMES W.;OHODNICKI, JR. PAUL R.;LI HONG;POLCYN ADAM D.