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- Sapphire Crystal

China Sapphire Crystal Suppliers

Sapphire glass
Sapphire Crystal has a crystalline rather than a glass-like structure. Sapphire has a Mohs hardness of 9, which is the third hardest of all transparent materials after Moissanite and diamond, so it is particularly valuable in this application because of its scratch resistance. Sapphire crystal is a high-purity synthetic sapphire (single crystal) made of fused alumina. The chemical formula is Al2O3, and the sapphire crystal is corundum.
Compared with traditional Quartz Glass or mineral glass, sapphire glass is slightly less sensitive to impact, and has a very high light transmittance and refractive index.
The physical properties of synthetic sapphire crystals:

Hexagonal crystal structure
Density: about 4 g / cm³
Melting point: +2050℃
Thermal conductivity at 25℃: 42 W/(m·K)
Compressive strength at 24°C: 2GPa
Tensile strength at 24°C: 186.4 MPa
100% acid resistance