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HOME PRODUCTS Quartz Blanks Custom Size Corning 7979 IR Grade Quartz

Custom Size Corning 7979 IR Grade Quartz Blanks

Product Item : HYRD-Q003
Category： Quartz Blanks
Material: Corning 7979 IR Grade Quartz
Silica purity: 99.99%
Dimension: Custom or Standard
Minimum Order Quantity: Negotiable
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Custom Size Corning 7979 IR Grade Quartz Blanks

Corning 7979 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.

HPFS® Summary of Key Attributes

Attribute	7979 IR Grade	7979 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.)		*

HPFS® Data and Properties

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]

7979 IR Grade

0, 1, 2

AA, A, C, F

”≤5

<100

7979 Industrial Grade

≤5

Mechanical Properties

Unless otherwise stated, all values @ 25 ℃
Elastic (Young’s) Modulus	73 GPa
Shear Modulus	31 GPa
Modulus of Rupture, abraded	52.4 MPa
Bulk Modulus	35.9 GPa
Poisson’s Ratio	0.16
Density	2.20 g/cm3
Knoop Hardness (100g load)	522 kg/mm2
Tensile Strength	54 MPa
Compressive Strength	1.14 GPa

Thermal Properties

Glass Code:	7979	Viscosity
Softening Point*	1627 ℃	107.6 poises
Annealing Point*	1180 ℃	1013 poises
Strain Point*	1068 ℃	1014.5 poises
Specific Heat 0.770 J/(g K)
Thermal Conductivity 1.38 W/(m K)
Thermal Diffusivity 0.0075 cm²/s
Thermal Expansion** (ppm/C):
5 ℃ to 35 ℃		0.52 x 10^-6
0 ℃ to 200 ℃		0.57 x 10^-6
-100 ℃ to +200 ℃		0.48 x 10^-6
ASTM Procedures - C-598, *E-228