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Milky Quartz Glass

Milky Quartz Glass
The milky quartz glass is made by melting vein quartz and quartz sand at high temperature, containing SiO2 over 99.5% . The material contains a large number of small bubbles (5000-8000/cm3), specifically used to manufacture quartz glass product for far-infrared heaters. When the heater is working normally, the visible light and infrared light emitted by the heating element (tungsten wire, nickel chromium wire) refract and reflect at the interface between bubbles and glass, forming a scattering effect. Photons transfer energy to Si and O molecules, generating vibrations with resonance frequencies located in the far-infrared region. They convert visible and near-infrared light into far-infrared, enhancing the intensity of far-infrared light. The infrared radiation energy of milky white quartz glass is 20%~38% higher than that of transparent quartz glass, which has energy-saving effect. The physical and chemical properties of milky white quartz glass are shown in the table below, where indicators such as thermal radiation coefficient, electrical energy to radiation energy conversion rate, and far-infrared transmittance are closely related to energy-saving effects.

The physical and chemical properties of milky white quartz glass

Properties
 Value
Density/（g/cm3）
 2.15
Coefficient of thermal expansion/×10-7℃-1
 5.4
Young's modulus/×10-4MPa
 7.4
Electrical resistivity（20℃）/(Ω/cm)
 2×1015
Electrical resistivity（800℃）/(×105Ω/cm)
 2×105
Thermal inertia
 Reaching equilibrium temperature 10~30s
Breakdown voltage（400℃）/kV
 3.25
Permeability（100℃）
 Non permeable to aqueous and acidic solutions
Voltage withstand（20℃）/（kV/mm）
 10
Voltage withstand（500℃）/（kV/mm）
 2~3
Thermal radiation coefficient ε
0.92
Electricity to radiation conversion rate η/%
 60~65
Purity（SiO2）/%
 99.8~99.9
Far infrared transmittance
 Good

Milky white quartz glass can be used to manufacture infrared heaters, heaters, crystal heaters, etc. It is mainly used for heating electroplating solutions, acid heating, household heating, tempered glass heating, etc. It is also used as a drying oven for industrial paint baking (bicycles, cars, etc.), as well as in the food, paper, and textile industries.

Milky Quartz Glass

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