Sapphire-Optical crystal-Beijing Honour Optics Co., Ltd-Honour Optics Co., Ltd

Sapphire

Sapphire is one of the high quality infrared materials with excellent transmitting property across visible and mid-infrared waveband. It is the main substrate material for GaN LED. Because of its high hardness, sapphire is also used as protective windows of watches and other precise mechanical devices.

Physical Properties

Melting Point (℃)	2040
Density (g/cm3)	3.98
Hardness(knoop)(kg/mm2)	9Mohs
	1800 knoop, parallel to C-axis
	2200 knoop, perpendicular to C-axis
Young’s Modulus (Gpa)	410
Poisson's Ratio	0.27
Flexural Strength (Mpa)	880
Thermal Expansion Coefficient (10-6, K-1)	6.7,parallel to C-axis
Thermal Expansion Coefficient (10-6, K-1)	5.0,perpendicular to C-axis
Thermal Conductivity (@300K,Wm-1.K-1)	35,parallel to C-axis
Thermal Conductivity (@300K,Wm-1.K-1)	33,perpendicular to C-axis
Heat Capacity (Cal/g.K)	0.18

Optical Properties

Refractive Index (@0.58μm) 1.769

QQ图片20201224141022.png

Dielectric Constant 11.5,parallel to C-axis

9.4,perpendicular to C-axis

Products Specifications

Shape only boule available

Maximum Dimension ∮180×180mm