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 µ 50%, 6 µ 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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