High Purity Fused Silica

Product Item : AT-61149
Category： Glass-Ceramic Optical Substrates
Product description：Fused Silica is offered in many different grades to support various product applications. Glass codes 7980, 7979, and 8655 are high purity non-crystalline silica glasses with excellent optical qualiti
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High Purity Fused Silica

Fused Silica is offered in many different grades to support various product applications. Glass codes 7980, 7979, and 8655 are high purity non-crystalline silica glasses with excellent optical qualities.

Product characteristics include 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; all of which are critical to our customers’ demanding needs.

Summary of Key Attributes

Attribute	Fused Silica
Attribute	7980 Standard Grade	7980 KrF Grade	7980 ArF Grade	7980 Mirror Grade	7980 Industrial Grade	7979 IR Grade	8655 ArF Grade
Visible TransmittanceTransmittance	■	■	■	■	■	■	■
UV Transmittance	■	■	■				■
Infrared Transmittance						■	■
Homogeneity Certified in Use-Axis AA, A, C, F (By Size)	■	■	■			■	■
Inclusion Class Certified 0, 1, 2, 5	■	■	■	■		■	■
Striae Certified ISO 10110-4 Class 5 (None)	■	■	■	■		■	■
Homogeneity Certified in Off-Axis AA, A, C, F (By Size)	■	■	■			■	■
Low Birefringence	■	■	■	■		■	■
UV Laser Resistant (Data available upon request)		■	■				■
Economical (No certification of any properties except visible transmission. Tooling applications.)					■

Quality Grade Selection Chart

For Mirror Grade - see chart on next page

Inclusion Class			Homogeneity 3,4 [ppm]
Inclusion Class			Grade
Class	Total Inclusion Cross Section1 [mm2]	Maximum Size2 [mm]	AA ≤ 0.5	A ≤ 1	B ≤ 1.5	C ≤ 2	D ≤ 3	E ≤ 4	F ≤ 5	G NS5
0	≤0.03	0.10	■	■	■	■	■	■	■	■
1	≤0.10	0.28		■	■	■	■	■	■	■
2	≤0.25	0.50			■	■	■	■	■	■
3	≤0.50	0.76				■	■	■	■	■
4	≤1.00	1.00				■	■	■	■	■
5	≤2.00	1.27				■	■	■	■	■