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Grade: Grade 5
Formula: Al₂O₃
Form: Balls
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Diameter:
1mm
Quantity:
10 piece
Sphericity:
0.125µm
Grade 5 Alumina Balls are spherical granules made of high purity alumina ceramic. This material is characterized by its high hardness, wear resistance, and chemical inertness. Grade 5 Alumina Balls are commonly used as grinding media in ball mills for mineral processing and in the manufacturing of cements, ceramics, glazes, and inks. They are part of Goodfellow's range of ceramic spherical granules, with a number of quantitie variations available.
Tolerances
Balls
| Diameter | Standard | ±5% |
|---|---|---|
| Diameter | Precision | See Item |
Material Properties for Ceramics
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Good |
| Acids - dilute | Good |
| Alkalis | Good |
| Halogens | Good |
| Metals | Good |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 9-10.1 |
| Dielectric strength( kV mm⁻¹ ) | Oct-35 |
| Volume resistivity( Ohmcm ) | >10¹⁴@25 |
Physical Properties
| Element | Value |
|---|---|
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 3.9 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 2100 |
| Upper continuous use temperature( C ) | 1700 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 850-900@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 26-35@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 8@20-1000°C |
Mechanical Properties
| Element | Value |
|---|---|
| Tensile modulus( GPa ) | 300-400 |
| Hardness - Knoop( kgf mm⁻² ) | 2100 |
| Hardness - Vickers( kgf mm⁻² ) | 1500-1650 |
| Shear strength( MPa ) | 330 |
| Tensile strength( MPa ) | 260-300 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 2200-2600 |