... adopt platinum molding technology OD:4~315mm,Wall Thick:1-10mm We have our own furance for the ... The outer diameter is 4~315mm, wall thickness is 1~10mm, and the length is freeWe adopt platinum molding ... ) Na2O(+K2O): 4.3 0.2% Chemical properties: 1) Coefficient of mean linear thermal expansion (20 C/300 ... C):3.3 0.1 (10-6K-1) 2) Transformation temperature: 525 15 C 3) ...