Ferro-Ceramic Grinding Inc. machines over 15 different materials

Alumina 99.5% Properties

Alumina 99.5% Alumina represents the most commonly utilized ceramic material in industry. Purity levels are available from 85% through 99.99%
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Alumina 99.5%

Alumina represents the most commonly utilized ceramic material in industry. Purity levels are available from 85% through 99.9%.  This is because of extremely superior abrasion, high temperature and chemical resistance.  It is electrically insulating as well.  This material has an excellent cost to part life performance record.

Applications include wear and heat resistant liners, mechanical and pump seals, nozzles, semiconductor equipment components, insulators, etc

Properties	Units	Test	Value
Physical
Chemical Formula	-	-	Al2O3
Density, r	g/cm3	ASTM C20	3.7-3.97
Color	-	-	ivory/white
Crystal Structure	-	-	hexagonal
Water Absorption	% @R.T.	ASTM C373	0.0
Hardness	Moh's	-	9
Hardness	knoop (kg/mm2)	Knoop 100g	2000
Mechanical
Compressive Strength	MPa @ R.T.	ASTM C773	2070-2620
Tensile Strength	MPa @ R.T.	ACMA Test #4	260-300
Modulus of Elasticity (Young's Mod.)	GPa	ASTM C848	394
Flexural Strength (MOR)	MPa @ R.T.	ASTM F417	310-379
Poisson's Ratio, u	-	ASTM C818	0.27
Fracture Toughness, KIc	MPa x m1/2	Notched Beam Test	4.5
Thermal
Max. Use Temperature (* denotes inert atm.)	ºC	No load cond.	1750
Thermal Shock Resistance	DT (ºC)	Quenching	200
Thermal Conductivity	W/m-K @ R.T.	ASTM C408	35
Coefficient of Linear Thermal Expansion, al	mm/m-ºC (~25ºC through ±1000ºC)	ASTM C372	8.4
Specific Heat, cp	cal/g-ºC @ R.T.	ASTM C351	0.21
Electrical
Dielectric Constant	1MHz @ R.T.	ASTM D150	9.6
Dielectric Strength	kV/mm	ASTM D116	15
Electrical Resistivity	Wcm @ R.T.	ASTM D1829	>1014

*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.