1、Chemical composition in approximate weight:（ｗｔ％） CHEMICAL DATA SiO2 Al2O3 CaO+MgO Na2O K2O Other wt% 71 2 8 16 2 1  2、Physical Data: Coefficient of mean linear thermal expansion Softening point （℃） Annealing point （℃） Density（g/cm3） Light transmiting 98.0×10-7/℃ 695 514 2.47 （546nm）92%  3.Specification of tubing: We can surpply ￠7-￠30mm Soda Lime glass tubing.