Alumina is one of the most cost effective and widely used material in the family of engineering ceramics. The raw materials from which this high performance technical grade ceramic is made are readily available and reasonably priced, resulting in good value for the cost in fabricated alumina shapes. With an excellent combination of properties and an attractive price, it is no surprise that fine grain technical grade alumina has a very wide range of applications.

Key Properties

- Hard, wear-resistant
- Excellent dielectric properties from DC to GHz frequencies
- Resists strong acid and alkali attack at elevated temperatures
- Good thermal conductivity
- Excellent size and shape capability
- High strength and stiffness
- Available in purity ranges from 94%, an easily metallizable composition, to 99.8% for the most demanding high temperature applications.

Key Features of Some Advanced Technical Ceramics

Characteristics	Unit	95 Al2O3	99 Al2O3	ZrO2	SSiC	SiSiC	B4C	HPS3N4
Color		white	ivory	white	black	black	black	dark gray
Density	g/cm3	3.65	3.88	6.05	3.12	3.06	2.51	3.25
Young's Modulus	Gpa	280	350	205	400	320	420	310
Vickers Hardness	Gpa	14	20	12	25	22	36	22
Flexural Strength	Mpa	280	300	900	400	300	370	850
Compressive Strength	Mpa	1700	2000	2500	2200	2000	2900	2800
Thermal Conductivity	W/(m?K)	25	30	2.2	100	130	35-40	27
Thermal shock resistance	ΔT(C°)	220	180-200	400	350	220	130	450-650
Max. Working Temperature	C°	1500	1700	850	1500	1300	1500	1200
Volume Resistivity ( 20 C° )	Ω?cm	>10^15	>10^14	>10^12	>10^6	>10^6	_	>10^14

Typical Uses
- Gas laser tubes
- Wear pads
- Seal rings
- High temperature electrical insulators
- High voltage insulators
- Furnace liner tubes
- Thread and wire guides
- Electronic substrates
- Ballistic armor
- Abrasion resistant tube and elbow liners
- Thermometry sensors
- Laboratory instrument tubes and sample holders
- Instrumentation parts for thermal property test machines
- Grinding media