Technical Data:
Physical Property
No. Physical performance Numerical Value Unit
1 Coefficient of mean linear thermal expansion(*0?, **0?) 3.3?0.1 ***6K*1
2 Transformation temperature **5?*5 ?
3 Softening point **0?*0 ?
4 Working point ***0?*0 ?
5 Density at *0? 2.*3?0.*2 g/cm3
6 Mean thermal conductivity(*0?***0?) 1.2 w/m2k
7 Refractive index 0.*2 1

Main Composition
SiO2 B2O3 Na2O+K2O Al2O3
*1 *3 4 2

Chemical Property
Hydrolytic resistance at *8? ISO***-HGB 1
Hydrolytic resistance at **1? ISO***-HGA 1
Acid resistance Class ISO****-First Class