21.Ferro Frit 3271 M.P./°F 1500 Equivalent Molecular Weight: 247.577 Molecular Formula of Ferro Frit 3271: Na2O 0.514 B2O3 0.768 SiO2 2.250 CaO 0.486 Percentage Analysis 54.58 % SiO2 12.87 % Na2O 11.01 % CaO 21.54 % B2O3 _____________________ 100 % TOTAL Comments: 9.3 x 10-6 coefficient of expansion (50-450° C)