Tables of Material Data

Table 2: Material Data

Column 2: The sealing metals indicated are described in table 3.
Column 3: a _20-300: Mean linear coefficient of expansion in the temperature range from 20 to 300°C according to DIN 52 328.
Column 4: T_g: Transformation temperature according to DIN 52 324
Column 5: Viscosity: The indicated viscosity temperatures mark the following processing stages.
10^7.6 dPas (softening temperature): Noticeable deformation of glasses under their own weight, even after short heating periods (minutes).
10⁴ (processing temperature): Central viscosity of the range from 10³ to 10⁵ dPas in which most processing techniques such as pressing, blowing and drawing are applied.
Column 7: t_k100 value: Temperature at which the electrical resistivity is 10⁸ W cm according to DIN 52 326.
Column 9: DZ: Dielectric constant; tan d: Dissipation factor.
Column 10: W: Resistance to water according to DIN ISO 719
S: Resistance to acid according to DIN 12 116
L: Resistance to alkaline solutions according to DIN ISO 695
W is subdivided into 5 resistance classes, S into 4 and L into 3. The higher the class number, the lower the resistance.