PROPERTIES	UNITS	VALUE
Density	gm/cc	397.00%
Hardness	knoop	1900/2200
Modulus of Elasticity	psi x 10^6	68
Flexural Strength	kpsi	100
Compressive Strength	kpsi	425
Poisson's Ratio		0.28
Fracture Toughness	MPa m^1/2
Dielectric Strength	ac volts/mil	1200
Dielectric Constant	averahe	11.5/9.3
Volume Resistivity	ohm-cm^2/cm	>10^14
Coefficient Thermal Expansion	x10^6/C	5.4/4.3
Thermal Conductivity	W/mK	46
Specific Heat	cal/gC	0.16
Max. Working Temp	C	2000
Shock Resistance	C diff.
Index of Refraction		1.768/1.76
Birefringence	N-N	0.008
Transmission Band	Wavelength of Microns	0.3--5.0