US Patent 9324894 Glass sheet with high energy transmission

The invention relates to an extra-clear glass sheet, i.e. a glass sheet with high energy transmission, which can be used in particular in the field of solar energy. Specifically, the invention relates to a glass sheet having a composition that includes, in an amount expressed in wt % for the total weight of the glass: 60-78% of SiO2; 0-10% of Al2O3; 0-5% of B2O3; 0-15% of CaO; 0-10% of MgO; 5-20% of Na2O; 0-10% of K2O; 0-5% of BaO, wherein the total amount of iron (in the form of Fe2O3) is 0.002-0.03%, and the composition includes a ratio of manganese/(total iron) of 1 to 8.5, the manganese content being expressed in the form of MnO in wt % relative to the total weight of the glass.