ALKALI FREE 7059® - CORNING®7059

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

 

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Designed by Kim Kelly