commonly

Chemical composition

Single Crystal Al2O3

melting point

2050℃

thermal physics

Coefficient of expansion

Parallel optical axis： 6.7×10-6 

Vertical axis： 5.0×10-6 

specific heat

1011Ω/cm 25℃；106Ω/cm 50℃；103Ω/cm 100℃

Mechanics

density

7.5-10

hardness

Normal atmospheric temperature is not affected by acid corrosion，It can be eroded by HF at 300 centigrade

Modulus of elasticity

340-380Gpa

compressive strength

2.1Gpa

tensile strength

0.19Gpa

optics

Refractive index

Parallel optical axis：1.769；Vertical axis：1.76

Light transmittance

83% （300nm~~5500nm）

Electrical

resistivity

1011Ω/cm 25℃；106Ω/cm 50℃；103Ω/cm 100℃

Dielectric constant

7.5-10

Chemistry

Corrosion resistance

Normal atmospheric temperature is not affected by acid corrosion，It can be eroded by HF at 300 centigrade