General Introduction: Corning 7979 are high purity, noncrystalline silica glasses that combine a very low thermal expansion coefficient with excellent optical qualities and exceptional transmittance. Characteristics include homogeneity, low birefringence and outstanding transmittance in the DUV, UV, visible, and infrared ranges.
Corning HPFS Fused Silica glasses are known throughout the industry for their consistent, repeatable performance. We offer many different grades of fused silica to support various product applications. Glass codes 7979 is high purity non-crystalline silica glasses with excellent optical qualities. Product characteristics include extraordinarily low refractive index variations leading to state-of-the-art homogeneity values, low 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
Products Name: Corning 7979 Fused Silica Glass
Alias: HPFS Fused Silica 7979,Corning 7979, Corning 7979 fused silica, Corning 7979 fused silica glass, HPFS Corning 7979 fused silica, Corning 7979 semiconductor, 7979 Corning, 7979 Corning glass, Corning 7979 glass, 7979 Corning fused silica,etc
Optical and Thermal Properties:
Glass Code: | 7979 | Viscosity |
Softening Point* | 1627 ˚C | 107.6 poises |
Annealing Point* | 1180 ˚C | 1013 poises |
Strain Point* | 1068 ˚C | 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 ˚C to 35 ˚C | 0.52 x 10-6 | |
0 ˚C to 200 ˚C | 0.57 x 10-6 | |
-100 ˚C to +200 ˚C | 0.48 x 10-6 | |
ASTM Procedures - *C-598, **E-228 |
Unless otherwise stated, all values @ 25 °C | |
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 |
Grade | 7979 IR Grade; |
Inclusion Class | 0, 1, 2 |
Homogeneity Grade | AA, A, C, F |
Birefringence Lower specifications available upon request[nm/cm] |
≤ 5 |
Striae ISO 10110-4 Class | 5 |
Metallic Impurities [ppb] | < 100 |
OH Content [ppm] | < 1 |
Applying Fields: |
Application of microlithography Lithography lens, Photomask substrate Deep ultraviolet laser element Optical standard parts Excimer laser optics Lithographic optics Beam transmission element Light guide Laser fusion Application of various aerospace technologies |
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Main Cooperation Materials Manufacturers:
CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas:
Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Name: Mr. Rex Wang
Mobile:008618918819340
Tel:0086 021-59962058
Email:rex@smart-crystal.cn
Add:No.518, Hengguan Road, Shanghai,China,202018