Properties Of Sapphire

.Basic Information Of Synthetic Sapphire 

    For Your Better Understanding of Synthetic Sapphire, We supply the basic properties of our materials.Please check the below Form and the properties for Sapphire material :

Basic Properties Of Synthetic Sapphire 

Properties Index
 Chemical Formula:  Al2O3
 Optical Index Of Refraction:  No:1.768/ Ne:1.760 @589.3nm
 Compressive Strength:  300,000 PSI
 Flexural Strength :  100,000 PSI
 Tensile Strength:  58,000 PSI
 Mohs Hardness:  9 Grade
 Maximum Temperature (Continuous):  2000℃
 Coefficient Of Expansion-Perpendicular to C-axis:

 4.3x10-6/℃ 

 Coefficient Of Expansion-Parallel to C-axis:  5.4x10-6/℃ 
 Conductivity:  46w/mk
 Specific Heat (0~100℃):  0.16cal/g℃ 

 

.Advantages Of Synthetic Sapphire 

   Please check the following list of competitions between sapphire and other optical materials .

Basic Specifications Of Common Optical Materials

  Properties/Name

B270 CaF2 Ge N-BK7 Fuzed Silica Sapphire

Refractive index (nd)

1.523 1.434 4.003 1.517 1.458 1.768
Coefficient of dispersion (Vd) 58.5 95.1 N/A 64.2 67.7 72.2

Density(g/cm3)

2.55 3.18 5.33 2.46 2.2 3.97

TCE(μm/m℃)

8.2 18.85 6.1 7.1 0.55 5.3
Soften Temperature(℃) 533 800 936 557 1000 2000
Knoop hardness(kg/mm2) 542 158.3 780 610 500 2200

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