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Physical characteristics

Item	Brown Aluminum Oxide	White Aluminum Oxide	Pink Aluminum Oxide	Black Silicon Carbide	Green Silicon Carbide
Basic mineral	ά-Al₂O₃	ά-Al₂O₃	ά-Al₂O₃	ά-SiC	ά-SiC
Crystal system	Hexagonal	Hexagonal	Hexagonal	Hexagonal	Hexagonal
Crystal color	Brown	White	Pink	Black	Green
Density	> 3.90g/cm³	> 3.90g/cm³	> 3.90g/cm³	> 3.12g/cm³	> 3.18g/cm³
Mohs hardness	9	9	9	9.15	9.15
Micro hardness	HV1800-2200	HV2200-2300	HV2200-2300	HV3100-3280	HV3280-3400
Grinding ability (compared with diamond as one)	0.10	0.12	0.12	0.25	0.28
linear expansion coefficient(when 900¡æά¡¤10^-6k^-1)	7.6	8.3	8.3	4.4	4.6
Electrical resistivity	10¹⁴~10¹⁶Ω cm			3 X 10⁵~3 X 10⁷Ω .cm