Quartz glass Characteristics of quartz glass Quartz glass is a one-component glass (SiO2). It is one
Characteristics of quartz glass
Quartz glass is a one-component glass (SiO2). It is one of the most valuable materials for both
science and industry. There is a distinction between synthetic and natural quartz glass. Synthetic
quartz glass is made from pure silicon tetrachloride (SiCl4) following the Flammpyrolyse-method.
The raw material of quartz glass is a natural crystal mined from the earth as rock crystal or
pegmatite quartz. The raw material is pulverized to a fine-particle granulate and melted to quartz
glass in an oxy-hydrogen flame.
Quartz glass features
- good transmission behavior in ultra-violet, visible and infrared wavelengths
- high temperature endurance
- a low coefficient of thermal expansion
- good thermal shock resistance
- excellent electrical insulation
- high chemical purity
- a maximum operating temperature of 1100°C (permanently), or 1300°C (short-time)
Thermal extension: 20/300 = 5,1×10-7 K-1Density: 2,2 g/cm³Modulus of elasticity: 70000 N/mm²Poisson's ratio m: 0,17Compressive strength: 1150 N/mm²Tensile strength: 50 N/mm²Bending strength: 67 N/mm²Thermal conductivity: (20-100°C) 1,38-1,46 W m-1 K-1
Logarithm of the electrical volume resistance in -cmat 20°C 20at 100°C 18at 600°C 12at 1000°C 8Dielectrical properties for 1 MHz at 25°C DZ 3,7Refractive index nd (=587,6 nm): 1,459Stress-optical constant: 3,57×10-6 N -1
Chemical resistanceResistance to water (DIN ISO 719):HGB 1 Hydrolytic class 1Resistance to acid (DIN 12116) class 1Resistance to alkali (DIN ISO 695)class 1
Applications
- high-temperature processes (high temperature resistance)
- semiconductor- and light-industry (purity)
- optics (good light transmission in visible, UV and IF wavelengths)
- laser technology
- electronics and electro-technology (low conductivity, high penetration field strength, low dielectric loss factor)
- chemistry and pharmaceutics (chemical resistance, not hygroscopic, chemical purity, thermal shock resistance)