Features of quartz glass:
Quartz glass (also known as fused silica or fused silica) is an amorphous material with high-purity silicon dioxide (SiO ₂) as the main component. Because of its unique physical and chemical properties, it is widely used in optics, semiconductor, chemical industry, medical and other fields. The following are its main features:
1. Extremely high thermal stability
High temperature resistance: The softening point is as high as about 1700 ℃, and it can withstand high temperatures of over 1200 ℃ in the short term and over 1000 ℃ in the long term.
Low thermal expansion coefficient: The thermal expansion coefficient is extremely low (about 5.5 × 10 ⁻⁷/℃), with excellent heat shock resistance and the ability to withstand rapid temperature changes without cracking.
2. Excellent optical performance
High transmittance: High transmittance is observed in the ultraviolet to infrared wavelength range (190nm~350nm), with better transmittance in the ultraviolet region compared to ordinary glass.
Low refractive index: The refractive index is about 1.458 (wavelength 589nm), with low dispersion, suitable for precision optical components such as lenses and prisms.
3. Excellent chemical stability
Corrosion resistance: Except for hydrofluoric acid and hot phosphoric acid, it hardly reacts with other acids, bases, and salts, and its acid resistance is better than most materials.
High purity: Synthetic quartz glass has extremely low impurity content (<1ppm), suitable for harsh environments such as semiconductors and high-purity reagent containers.
4. Excellent mechanical and electrical properties
High hardness: Mohs hardness level 7, good wear resistance, but high brittleness, mechanical impact should be avoided.
Strong insulation: high resistivity (>10 ¹⁸Ω· cm at 20 ℃), low dielectric loss, making it an ideal high-temperature insulation material.
