Properties of
Synthetic Sapphire

Outstanding advantages
of synthetic sapphire and ruby

» High polish and low friction
» Hardness
» Miniature size, close tolerances
» Long, accurate wear life
» Resistance to heat, corrosion and deformability
» Non-magnetic properties
» High dielectric strength



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  Chemical composition Al2 O3
  Physical properties Crystal structure
Specific gravity
hexagonal rhombohedral
3,99 + 3,98
  Thermal properties Melting point
Thermal expansion
2050 C
5,4-106/0 C face perp. C axis
6,2-106/0 C face parall. C axis
  Mechanical properties Hardness mohs
Hardness knoop
Modulus of elasticity
9
1800 face perp. C axis
2200 face parall. C axis
4,4 x 106 kg/cm2/1% young
  Chemical properties Acids and alkalis attack
Porosity
0 at 300 C
0
  Electrical properties Dielectric constant
Electrical resistence
9,4 at 11,3
1011 ohm/cm at 500
106 ohm/cm at 1000
103 ohm/cm at 2000
  Optical properties Refractive index (at 5893 A nd)
Cromatic dispersion (6563)
Transmission visible
Infrared (th.1mm)
Ultraviolet:
Standard corundum

UV corundum
1760 face perp. C axis
1769 face parall. C axis
0,011
Excellent, 85%, 0.75-5
50%, 6
80% 4000 3000 A
50% 2000 A
80% 4000 3000 A
75% 2000 A
65% 1800 A
50% 1600 A
30% 1470 A
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