Updated October 20, 2006

Alumina is generally available in two concentrations: 99.5% and 96%. This ceramic is the workhorse of the microwave integrated circuit (MIC) business. 96% alumina is primarily used in high-temperature co-fired circuits, while 99.5% alumina is primarily used in thin film networks.

The data came from CoorsTek. The other 4% of the material is probably made up of some type of glass to lower the melting temperature.

Formula or Composition:	Al2O3
Dielectric Constant ():	9.0
Dissipation Factor (a.k.a. loss tangent, or tan):	0.0002
Temperature Coefficient of :	ppm/°C
Bulk Resistivity:	>10E14 -cm
Temperature Coefficient of Resistivity (TCR):	ppm/°C
Mass Density:	3.72 gr/cc
Specific Heat:	0.88 J/g/°C
Thermal Conductivity (k):	24.7 W/m°C
Temperature Coefficient of Expansion (TCE):	8.2 ppm/°C
Melting Point	°C °F