Raw materials
Quality quartz glasses, which Techno Quartz processes into a variety of components, feature
good heat resistance, high purity, and transparency.
Quartz Glass material
Quartz glass ingot
(weight: approx.3 tons)
Quartz glass is classified into 2 different types:
One is fused quartz fabricated by melting natural quartz crystal powders and the other is synthetic quartz, which is fabricated by chemically synthesizing silicon tetrachloride.
Other than SiO2 as principal component, there exists a fairly modest amount of hydrogen and chlorine (at most 0.1%) to form Si-OH group and Si-Cl group inside quartz. However, metal impurities are very little with some containing at most 10ppm and others containing less than 10ppb of metal impurities.
As seen above, quartz glass features many such properties as heat resistance, light transmission, electrical insulation, and chemical stability besides its high purity.
Standard physical property of fused quartz glass
| Characteristic | Standard value |
|---|---|
| Specific gravity | 2.2×103kg/m3 |
| Hardness | 5.5-6.5(Mohs） 570KHN100 |
| Tensile strength | 4.8×107Pa（N/m2）（7000psi) |
| Compressive strength | 1.1×109Pa以上（160,000psi) |
| Volume elasticity | 3.7×1010Pa（5.3×106psi) |
| Rigidity modulus | 3.1×1010Pa(4.5×106psi) |
| Young's modulus | 7.2×1010Pa（10.5×106psi) |
| Poisson ratio | 0.17 |
| Coefficient of thermal expansion (20-320 degree-c) | 5.5×10-7cm/cm・℃ |
| Heat conductivity | 1.4W/m・℃ |
| Characteristic | Standard value |
|---|---|
| Specific heat | 670J/kg・℃ |
| Softening point | 1683℃ |
| Slow cooling point | 1215℃ |
| Strain point | 1120℃ |
| Specific resistance (350 degree-c) | 7×107Ω・cm |
| Refracture index | 1.4585 |
| Astringency | 67.56 |
| Sonic velocity (Transverse wave) | 3.75×103m/s |
| Sonic velocity (Longitudinal wave) | 5.90×103cm/s |
| Sound-wave damping ratio | 11dB/m MHz or less |
Crystal silicon material
Large crystal silicon（Square 800mm）
Silicon is the second most common element to oxygen on the earth.
Silica stone, combined with oxygen to be a chief component of dirt and sand in nature, is something familiar to us.
Crystal Silicon , purified by reducing, distilling, and then refining silica stone, is one of the vital semiconductor raw materials in fabrication of silicon substrate from which IC chips origin
Techno Quartz fabricates and supplies a variety of highly pure Crystal Silicon products for Semiconductor Manufacturing equipment.