Corning® HPFS®7980 Fused Silica

Optical Materials Product Information

Corning 7980 is high purity non-crystalline silica glass with excellent optical qualities produced by Corning Company. The material is with extraordinary low refractive index variations leading to state-of-the-art homogeneity values, lowest birefringence values, large size capabilities, exceptional transmittance from the deep ultraviolet through the infrared region, and an ultra-low thermal expansion coefficient. The detail specification of Corning 7979 fused silica is as follows:

Attribute	7980 Standard Grade	7980 KrF Grade	7980 ArF Grade	7980 Mirror Grade	7980 Industrial Grade
Visible Transmittance	*	*	*	*	*
UV Transmittance	*	*	*
Infrared Transmittance
Homogeneity Certified in Use-Axis: AA, A, C, F (By Size)	*	*	*
Inclusion Class: 0, 1, 2, 5	*	*	*	*
Striae: ISO 10110-4 Class 5 (None)	*	*	*	*
Homogeneity Certified in Off-Axis: AA, A, C, F (By Size)	*	*	*
Low Birefringence	*	*	*	*
UV Laser Resistance (data available upon request)		*	*
Economical (No certification of any properties except visible transmission and birefringence. Tooling applications.)		*			*

Quality Grade Selection Chart

Attribute	ISO 10110-1 Inclusion Class	Homogeneity Grade [ppm]	Birefringence Lower specifications available upon request [nm/cm]	ISO 10110-4 Striae Class	Metallic Impurities [ppb]	OH Content [ppm]
7980 Standard Grade**	0-5	AA - F	≤5	5	<1000	800 - 1000
7980 KrF Grade*	0, 1, 2	AA, A, C, F	≤1	5	<500	800 - 1000
7980 ArF Grade*	0, 1, 2	AA, A, C, F	≤1	5	<100	800 - 1000
7980 Mirror Grade	See below	NS	≤5	1	NS	800 - 1000
7980 Industrial Grade	NS	NS	≤5	1	NS	800 - 1000

* No visible fluorescence when exposed to deuterium source from 215 nm - 400 nm. Material contains hydrogen to minimize absorption under UV exposures.
** HPFS® 7980 Standard Fluorescence-Free Grade available upon request.

Mechanical Properties