... coefficient,high temperature resistance,high intensity, high rigidity, transparency,chemical stability. COE:3.3 Regular1.diameter of our glass rod ... poisonous, and it has made the big progress in its mechanical property, thermal stability, hydrolytic resistance.acid resistance and alkali ... 4+- 0.2% 4) Na2O(+K2O): 4.3+-0.2%Chemical properties:1.Coefficient of mean linear thermal expansion: (20°C/300 ...