Alumina 99.5%

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 99.9%.

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	GPa	Knoop 1000gm	14.1
Mechanical
Compressive Strength	MPa @ R.T.	ASTM C773	2600
Tensile Strength	MPa @ R.T.	ACMA Test #4	262
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/mK	ASTM-C408	30
Coefficient of Linear Thermal Expansion, al	mm/m-ºC (~25ºC through ±1000ºC)	ASTM C372	8.2
Specific Heat, cp	J/kg*K	ASTM-E1269	880
Electrical
Dielectric Constant	1MHz @ R.T.	ASTM D150	9.7
Dielectric Strength	ac-kv/mm	ASTM D116	8.7
Electrical Resistivity	Wcm @ R.T.	ASTM D1829	>1014