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.

Formula or Composition:	Al2O3
Dielectric Constant ():	9.8
Dissipation Factor (a.k.a. loss tangent, or tan)	.0001
Temperature Coefficient of :	ppm/°C
Bulk Resistivity:	>1E14 -cm
Temperature Coefficient of Resistivity (TCR):	ppm/°C
Mass Density:	3.97 gr/cc
Specific Heat:	J/g/°C
Thermal Conductivity (k):	25.5 W/m°C
Temperature Coefficient of Expansion (TCE):	7.0
Melting Point	2072 °C 3762 °F