Quartz glass

Quartz glass for round sight gauge glass or tubular sight gauge glass
Normally,quartz glass is fused quartz is the widely usage in industry and home appliances.it is a glass consistant of almost pure silica in amorphous form,it’s purity up to 99.9% according to requirement.
Softening point is 1730,long time work temperature 1100,short time work temperature 1400
Shock thermal:taking out the glass from 1100 furnace into 20 water,no breakage three times.
The visible light transmittance is more than 93%.
Corrosion resistant:quartz glass can work in the intense acid and alkaline environment
Synthetic Quartz Silica and Infrared Optical Quartz both used as the optical glass.
Property  Typical Values
Density    2.2x103 kg/m3
Hardness 5.5 - 6.5 Mohs' Scale 570 KHN 100
Design Tensile Strength  4.8x107 Pa (N/m2) (7000 psi)
Design Compressive Strength          Greater than 1.1 x l09 Pa (160,000 psi)
Bulk Modulus   3.7x1010 Pa (5.3x106 psi)
Rigidity Modulus      3.1x1010 Pa (4.5x106 psi)
Young's Modulus      72GPa (10.5x106 psi)
Poisson's Ratio         0.17
Coefficient of Thermal Expansion    5.5x10 -7 cm/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 Resistivity         7x107 ohm cm (350°C)
Dielectric Properties        (20°C and 1 MHz)
Constant 3.75
Sonic Attenuation    Less than 11 db/m MHz
Permeability Constants(700°C)       (cm3 mm/cm2 sec cm of Hg)
Helium     210x10-10
Hydrogen          21x10-10
Deuterium        17x10-10
Strength  5x107 V/m
Loss Factor       Less than 4x10-4
Dissipation Factor   Less than 1x10-4
Index of Refraction  1.4585
Constringence (Nu) 67.56
Velocity of Sound-Shear Wave 3.75x103 m/s
Velocity of Sound/Compression Wave     5.90X103 m/s
Neon         9.5x10-10