ALUMINUM OXIDE CERAMIC BALLS (Al2O3)

Polycrystalline structure light weight oxide balls, they provide good mechanical characteristics, corrosion, abrasion and heat resistance. They are auto lubricant and good electric insulators. Natural colour white/ivory.
Applications
Special bearings, check valves, pumps and valves that operate in aggressive environments, petroleum pumps, flow meters, measurement instruments, medical devices.
Commercial name
Other name
Formula
Oxide %
Aluminum Trioxide
Alumina
Al2O3
99.00 - 99.99
Physical / mechanical / thermal / electric / magnetic properties
Property
Symbol
U.o.M.
Type
Notes
Values
Density
δ
[g/cm3]
Physical
Room temp.
3.90
Young's modulus
E
[GPa]
Mechanical
-
365
Friction coefficient
µ
-
Mechanical
Room temp.
0.2
Specific heat
c
[J/kg-K]
Thermal
Room temp.
795
Coefficient of linear thermal expansion
α
[10^-6/ºC]
Thermal
(ΔT=0-100°C)
7.8
Thermal conductivity
λ
[W/(m·K)]
Thermal
Room temp.
31.0
Volume resistivity
ρ
[Ω*m]
Electric
-
> 10^14
Relative magnetic permeability
µ
-
Magnetic
Diamagnetic
<~1
Technical data
Property
Type
U.o.M.
Values
U.o.M.
Values
Hardness
Mechanical
[HV]
1250 - 1700
-
-
Ultimate compressive strength
Mechanical
[MPa]
2100 - 2600
[psix10^3]
304 - 377
Service temperature
Thermal
[ºC]
-100 / 1600
[ºF]
-148 / 2912
Range
Diameters (min/max)
U.o.M.
Diameters (min/max)
U.o.M.
Precision grades (ISO 3290 / AFBMA)
0.300 - 100.000
[mm]
1/64 - 4
["]
G10-16-20-25-28-40-60-100
Corrosion Resistance
Excellent corrosion resistance in water, salt solutions, acids, they are resistant even into aggressive environments excepted hydrofluoric, hydrochloric acids, hot sulphuric acid and strong alkaline solutions.
Revision n.12