Ceramic Alumina

PROPERTY	UNITS	TEST	AD-94	AD-995	AD-998	AD-999
Density	gm/cc	ASTM-C 20	3.7	3.93	3.92	3.96
Crystal , Avg	MICRONS	THIN-SECTION	12	6	6	3
Color	*	*	White	Ivory	Ivory	Ivory
Flexural Strength (MOR), 20 degree	MPa	ASTM-F417	352 (51)	400 (58)	375 (54)	552 (80)
Elastic Modulus, 20 degrees	GPa	ASTM-C848	303 (44)	370 (54)	370 (54)	386 (56)
Poisson's Ratio 20 degrees	*	ASTM-C848	0.21	0.22	0.22	0.24
Compressive Strength, 20 degrees	MPa	ASTM-C773	2103 (305)	2680 (390)	2500 (363)	3792 (550)
Fracture Toughness, Klc	Mpa m^1/2	Notched Beam	4 5	4 5	4 5	4 5
Thermal Conductivity, 20 degree	W/m K	ASTM-C408	22.4	30	30	36
CTE, 25-1000 degrees	1X10^-6/ C	ASTM-C372	8.2	8.2	8.2	8.4
Thermal Shock Resistance	C	NOTE 3	250	200	200	200
Maximum Use Temp.	C	NO-LOAD COND.	1700	1750	1750	1900
Volume Resistivity, 25 Degrees	Ohm-cm	ASTM-D1829	>10^14	>10^14	>10^14	>10^14
Volume Resistivity, 500 Degrees	Ohm-cm	ASTM-D1829	4 X 10^9	1 X 10^10	2 X 10^10	3.3 X 10^12
Volume Resistivity, 1000 Degrees	Ohm-cm	ASTM-D1829	5 X 10^5	3 X 10^6	2 X 10^6	1.1 X 10^7
Hardness	GPa	Rockwell 45N	78	83	83	90