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UV Fused Silica

Fused Silica is formed by chemical combination of silicon and oxygen. Fused Silica is perfect optical material due to its good UV and IR transmission, low coefficient of thermal expansion. It has high stability and resistance to thermal shock over large temperature excursions, wide temperature operating range and high laser damage threshold.
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Fused Silica is formed by chemical combination of silicon and oxygen. Fused Silica is perfect optical material due to its good UV and IR transmission, low coefficient of thermal expansion. It has high stability and resistance to thermal shock over large temperature excursions, wide temperature operating range and high laser damage threshold.
 
Properties
Density 2.20g/cm3
Abbe Constant 67.6
Refractive Index (nd) at 588nm 1.4586
Wavelength
(um)
Refractive
 Index (n)
Wavelength
(um)
Refractive
Index (n)
0.2 1.55051 1 1.45042
0.22 1.52845 1.064 1.44962
0.25 1.50745 1.1 1.4492
0.3 1.48779 1.2 1.44805
0.32 1.48274 1.3 1.44692
0.36 1.47529 1.5 1.44462
0.4 1.47012 1.6 1.44342
0.45 1.46557 1.7 1.44217
0.488 1.46302 1.8 1.44087
0.5 1.46233 1.9 1.43951
0.55 1.46008 2 1.43809
0.588 1.4586 2.2 1.43501
0.6 1.45804 2.4 1.43163
0.633 1.45702 2.6 1.42789
0.65 1.45653 2.8 1.42377
0.7 1.45529 3 1.41925
0.75 1.45424 3.2 1.41427
0.8 1.45332 3.37 1.4099
0.85 1.4525 3.507 1.40566
0.9 1.45175 3.707 1.39936
 

There are different types Fused Silica according the different application. In China, there are mainly three types, i.e. JGS1, JGS2, JGS3.Below are the application and their equivalent to other Fused Silica supplier.


JGS1


UV grade Fused Silica: (JGS1) is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in thf orientation and temperature instability inherent in the crystalline form. Fused silica is used for both transmissive at ultraviolet. Transmission and homogeneity exceed those of crystalline quartz without the problems on reflective optics, especially where high laser damage threshold is required. JGS1 is transparent in the ultraviolet and visible regions, and has no absorption bands in the 170-250 nm wavelength intervals. It has an intensive OH absorption band in the interval of wavelength 2600-2800 nm.  


JGS1 is used for optics operating in the deep UV and the visible wavelength range (Laser Lenses, Windows, Prisms, Mirrors, etc.). It is practically free of bubbles and inclusions.



JGS2


Optical Grade Fused Quartz (JGS2) provides good UV and visible transmission. It has almost the same physical and chemical properties with JGS1. However only in thin & small sheet pieces, JGS2 is virtually bubble-free. Elements built from larger pieces will most likely contain bubbles, so application should not be sensitive to these inclusions. But in cases where simple light gathering and strong mechanical properties are the primary goals, JGS2 grade provides excellent performance at a low price.  Ideal Applications for JGS2:  


● Condenser optics not concerned with scatter or distortion
● High temperature and pressure applications
● Optical flats, microscope slides and sight glasses


JGS3


JGS3:equivalent to Suprasil 300 (Heraeus). JGS3 is transparent in the ultraviolet, visible and infrared spectral regions, without considerable absorption bands in the 185-250 nm spectral region.

 

Hardness 5.5 - 6.5 Mohs Scale 570 KHN 100 
Design Tensile Strength 4.8x107 Pa (N/mm2) (7000 psi) 
Design Compressive Strength Greater than 1.1x109 Pa (160,000 psi) 
Bulk Modulus 3.7x1010 Pa (5.3x106 psi) 
Rigidity Modulus 3.1x1010 Pa (4.5x106 psi) 
Youngs Modulus 7.2x10-10 Pa (10.5x106 psi) 
Poissons Ratio 0.17 
Coefficient of Thermal Expansion 5.5x10-7cm/cm.°C (20°C-320°C) 
Thermal Conductivity 1.4 W/m.°C 
Specific Heat 670 J/kg.°C 
Softening Point 1683°C 
Annealing Point 1215°C 
Strain Point 1120°C 
Electrical Receptivity 7x107 ohm.cm (350°C) 
Dielectric Properties (20°C and 1 MHz)
Constant 3.75
Strength 5x107 V/m
Loss Factor Less than 4x10-4
Dissipation Factor Less than 1x10-4 
Velocity of Sound-Shear Wave 3.75x103 m/s 
Velocity of Sound/Compression Wave 5.90x103 m/s 
Sonic Attenuation Less than 11 db/m MHz 
Permeability Constants (cm3mm/cm2 sec cm of Hg) (700°C)
Helium 210x10-10
Hydrogen 21x10-10
Deuterium 17x10-10
Neon 9.5x10-17
Chemical Stability (except hydrofluoric) High resistance to water and acids 


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Crystallographic properties
Syngony Cubic
Crystal Form Poly or Single Crystal
Lattice Constant 5.66
Cleavability <111>, non-perfect
Molecular Weight 72.6
Physical properties
Density, at 20 °C 5.33
Hardness, Mohs 6.3
Dielectric Constant for 9.37 × 109 Hz at 300 K 16.6
Melting 937
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Thermal Expansion, 1/K at 298 K 6.1 × 10-6
Specific Heat Capacity, J/(kgK) at 273-373 K 0.074
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Knoop Hardness, kg/mm2 800
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Debye Temperature, K 370
Poissons Ratio 0.278
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Molecular Weight 72.59

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Syngony Cubic
Lattice Constant, A 5.43
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Melting point, оС 1414
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Thermal Expansion, 1/K at 293 K 2.6x10-6
Specific Heat Capacity, J/(kg°C) 712.8
Bandgap, eV 1.1
Knoop Hardness, kg/mm2 1100
Youngs Modulus, Gpa 130.91
Shear Modulus, GPan 79.92
Bulk Modulus, GPa 101.97
Debye Temperature, K 640
Poissons Ratio 0.28
Chemical properties
Solubility in water None
Molecular Weight 28.09

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Surface Quality: ----------------------------80-50 scratch and dig
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