| Alkali Free Borosilicate: Corning® 7059 | ||
|---|---|---|
Glass Code: Corning® |
7059 |
|
Type |
Alkali Free Borosilicate |
|
Color |
Clear |
|
Principal Use |
Optics & Electrical Substrates |
|
Thermal Expansion Multiply by 10-7 cm/cm/°C |
0 - 300°C. |
46.0 |
Viscosity Data This data is subject to normal manufacturing variations. |
Strain Point°C. |
539 |
Annealing Point°C. |
639 |
|
Softening Point°C. |
844 |
|
Density q/cm3 |
2.76 |
|
Log10of Volume Resistivity ohm/cm. |
250°C |
13.1 |
Dielectric Properties (1 MHz 20°C) |
Dielectric Constant |
5.84 |
Loss Factor % |
.10 |
|
Refractive Index @ 435.8nm 546.1nm 643.nm |
1.544 1.534 1.531 |
|
Transmittance (t=0.5mm) |
˜70% (320nm) ˜90% (360nm) >90% (380-2200nm) |
|
Surface Smoothness |
.5 micro inch(typ) |
|
Surface Flatness |
.004 in/in typ |
|