EES Engineering are now working with synthetic sapphire for the medical industry. Tough, long lasting material now being worked by EES Engineering

Synthetically produced Sapphire. Single crystal Sapphire has a high thermal conductivity, volume resistivity, hardness and wear resistance, as well as a high upper use temperature. The energy band gap is large (10eV). Sapphire is a transparent material having useful transmission of wavelengths in the range 0.2 to 5.5 microns. It is much stronger than glass and can be used as viewing windows in high pressure and vacuum applications.

• Used in high-power, high-frequency CMOS integrated circuits.
• Used for high-power radio-frequency (RF) applications such as those found in mobile phones, police radios, and satellite communication systems
• Used in new generation phones using synthetic sapphire
• sapphire has a quite low conductivity for electricity, but a much-higher conductivity for heat.
• Good electrical insulation conducting away great heat from circuits.
• Sapphire is cut to wafers, wafers of single-crystal sapphire material are also used in the semiconductor industry as a non-conducting substrate
• The use of the sapphire material significantly reduces the cost as less germanium in compound.

  
  Chemical Resistance
  
  Acids - concentrated Good
  Acids - dilute Good
  Alkalis Good
  Halogens Good
  Metals Good
  
  Electrical Properties
  
  Dielectric constant 7.5-11.5
  Dielectric strength ( kV mm-1 ) 15-50
  Volume resistivity @25C ( Ohmcm ) >1014
  Mechanical Properties
  Compressive strength ( MPa ) 2100
  Hardness - Knoop ( kgf mm-2 ) 2000
  Hardness - Vickers ( kgf mm-2 ) 1600-1800
  Tensile modulus ( GPa ) 350-390
  
  Physical Properties
  
  Apparent porosity ( % ) 0
  Density ( g cm-3 ) 3.985
  Refractive index 1.71-1.79
  Useful optical transmission range 200-5500nm
  Water absorption - saturation ( % ) 0
  
  Thermal Properties
  
  Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 5.8
  Melting point ( C ) 2050
  Specific heat @25C ( J K-1 kg-1 ) 750
  Thermal conductivity @20C ( W m-1 K-1 ) 35-40
  Upper continuous use temperature ( C ) 1800-1950
  Properties for Sapphire Monofilament
  
  Property Value
  
  Filament diameter 0.11mm
  Density g cm-3 3.97
  Melting point C 2050
  Orientation <0001>
  Tensile modulus GPa 410
  Tensile strength GPa 2.1-3.4

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