99% Alumina Ceramic Properties

99% Alumina Ceramic Properties
Item	Unit
Physical Properties
Color		Ivory/Beige
Density	g/cm3	3.85
Alumina Content	%	99%
Gas permeability		0
Water Absorption		0
Mechanical Properties
MONS’ Hardness	Grade	9
Rockwell Hardness	HRA	92
Vickers Hardness (Hv50)	Gpa(Kg/mm²)	15.7（1600）
Flexural Strength(20°C)	Mpa	330
Compressive Strength(20°C)	Mpa	2000
Fracture Toughness(20°C)	MPam1/2	4
Modulus of Elasticity	Gpa	350-400
Thermal Properties
Thermal Conductivity(20°C-400°C)	W（m.K）	27.5
Thermal Expansion Coefficient	10-6/°C	7.6
Thermal Shock Resistance	△T°C	200
Maximum Use Temperature	°C	1650
Electronic Properties
Dielectric Strength	KV/mm	＞10
Dielectric Constant	Er	9.1
Dielectric Loss Angle(1MHz)		0.0002-0.0003
Volume Resistivity(20°C）	Ω.cm	＞1014

Composition of 99% Alumina Ceramics
Al2O3 (%)	≥99.00
SiO2 (%)	≤0.10
Fe2O3 (%)	≤0.10
Na2O (%)	≤0.40
Others （%）	≤0.40