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Formula: Al₂O₃
Form: Washer
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Alumina Washer are ceramic washers offered by Goodfellow within its extensive range of bolts and fasteners. With 101 size variations, these washers provide high hardness and compressive strength. Alumina Washer are electrically insulating and chemically inert, making them ideal for applications in corrosive environments. They also have high thermal conductivity, allowing them to dissipate heat in electronic components. Alumina's hardness and low friction make these washers suitable for high-wear applications.
Tolerances
Washer
| Size | 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 |