Materials | Fused Silica | Corning(R) 7980 Glass

Glass Type: Fused Silica

Description

Corning(R) 7980 glass is a result of melting synthetically derived silicon dioxide and is used in many of the same applications as fused quartz. The main differences are that fused silica transmits better in the UV and fused quartz is lower in OH content. Both are highly pure, have high chemical resistance, good thermal shock resistance, and low thermal expansion coefficient. CGQPI can CNC mill, cut, drill, lap, and polish Corning(R) 7980 into any dimension or surface finish.

Thermal Properties			Mechanical Properties
Thermal Coefficient of Expansion	(0/300°C): 5.5 X 10 -7/°C	Density	2.201 g/cm3
Annealing Point	1042°C/1907.6 °F	Knoop Hardness	522 Kg/mm2
Softening Point	1585°C / 2885 °F	Young's Modulus	72.7 Gpa
Strain Point	893°C/1639.4°F	Poisson's Ratio	.16

Thermal Properties

Mechanical Properties

Thermal Coefficient of Expansion

(0/300°C): 5.5 X 10 -7/°C

Density

2.201 g/cm3

Annealing Point

1042°C/1907.6 °F

Knoop Hardness

522 Kg/mm2

Softening Point

1585°C / 2885 °F

Young's Modulus

72.7 Gpa

Strain Point

893°C/1639.4°F

Poisson's Ratio

.16

Chemical Properties			Electrical Properties
Hydrolytic Resistance	N/A	Dielectric Constant	E=3.8
Acid Resistance	N/A	Resistivity	N/A
Alkali Resistance	N/A	Dielectric Strength	N/A

Chemical Properties

Electrical Properties

Hydrolytic Resistance

N/A

Dielectric Constant

E=3.8

Acid Resistance

N/A

Resistivity

N/A

Alkali Resistance

N/A

Dielectric Strength

N/A

Optical Properties
Refractive Index	1.45840 (589 nm)

Optical Properties

Refractive Index

1.45840 (589 nm)