Sapphire

What is Sapphire?

Sapphire (α-Al₂O₃) is widely used in many fields for its excellent characteristics, in particular chemical resistance, thermal conductivity, hardness, transparency. Orbray grows single crystal sapphire by EFG method, by which different cross-section forms can be obtained.

Characteristics of Single Crystal Sapphire

High-hardness
- abrasion resistance
Transparency
- in the range from ultraviolet to infrared light (200∼7000nm)
Chemical resistance and heat resistance
- resist almost all kinds of acid and alkaline, heat up ∼2000°C
Suitable for the application of insulation property required.

Applications of Single Crystal Sapphire

Sapphire Wafers
Semiconductor wafers
LED wafers
Projectors
Optical device wafers

Physical Properties Table

Single Crystal Sapphire Growth

Orbray produces single crystal sapphire in any desired section shape by EFG Method.
(Edge-defined Film-fed Growth Method)

Characteristics of EFG Method

Growth of sapphire wafers with large diameter
Controllability of crystal orientation

Crystal Shape after pull-up

Dimensions	Tolerance	Crystal Orientation	Surface Flatness
0.3∼300mm t=0.01∼100	±0.005	±2deg	Ra=0.0001μm
0.3∼300mm	±0.005	C Axis in	5μm
O.D:Max.φ100mm I.D:Min.Φ2.0mm	±0.005 ±0.002	- -	5μm
Offer any desired sectional shape.	-	C Axis in	5μm