PotteryCrafts Frit P2959 Silica/Alumina ratio: 8.2:1 Equivalent Molecular Weight: 456.087 Molecular Formula of PotteryCrafts Frit P2959: Na2O 0.400 Al2O3 0.300 SiO2 5.000 CaO 0.300 B2O3 1.000 MgO 0.250 ZnO 0.050 Percentage Analysis 65.84 % SiO2 6.71 % Al2O3 5.44 % Na2O 2.21 % MgO 3.69 % CaO 0.89 % ZnO 15.23 % B2O3 _____________________ 100 % TOTAL Comments: High temperature borax frit. From PotteryCrafts in England.