Click on table links below to see properties
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Ferro-Ceramic Grinding Inc. machines over 15 different materials

Sapphire

Sapphire Properties
Sapphire The advantages of sapphire as a design material are numerous. Extremely high use temperature, hardness, optical clarity and flexural.

Sapphire Properties

Sapphire

The advantages of sapphire as a design material are numerous. Extremely high use temperature, hardness, optical clarity, flexural strength, and chemical resistance make this an increasingly popular choice. Applications include grocery store scanner windows, watch glasses, and countless semiconductor and aerospace/military applications.

  

Properties
Units
Test
Value
Physical
Chemical Formula
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a-Al2O3
Density, r
g/cm3
ASTM C20
3.97
Color
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white/ transparent
Crystal Structure
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trigonal
Water Absorption
% @R.T.
ASTM C373
0.0
Hardness
Moh's
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9
Hardness
knoop (kg/mm2)
Knoop 100g
2200
Mechanical
Compressive Strength
MPa @ R.T.
ASTM C773
2000
Tensile Strength
MPa @ R.T.
ACMA Test #4
250 - 400
Modulus of Elasticity
(Young's Mod.)
GPa
ASTM C848
250 - 400
Flexural Strength (MOR)
MPa @ R.T.
ASTM F417
760 - 1035
Poisson's Ratio, u
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ASTM C818
0.29
Fracture Toughness, KIc
MPa x m1/2
Notched Beam Test
1.89
Thermal
Max. Use Temperature
(* denotes inert atm.)
șC
No load cond.
~2000
Thermal Shock Resistance
DT (șC)
Quenching
200
Thermal Conductivity
W/m-K @ R.T.
ASTM C408
40
Coefficient of Linear Thermal Expansion, al
mm/m-șC (~25șC through ±1000șC)
ASTM C372
7.9 - 8.8
Specific Heat, cp
cal/g-șC @ R.T.
ASTM C351
0.18
Electrical
Dielectric Constant
1MHz @ R.T.
ASTM D150
9.3 - 11.4
Dielectric Strength
kV/mm
ASTM D116
15 - 50
Electrical Resistivity
Wcm @ R.T.
ASTM D1829
1017
 
 
*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.