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Formula: Al₂O₃
Form: Tube
Material: Alumina
CAS Number: 1344-28-1
Commodity: Ceramics
Alumina Tube is a ceramic tube made from aluminum oxide that is part of Goodfellow's range of technical ceramic products. With 68 size variations, Goodfellow's alumina tubes provide options for a wide variety of applications. The high hardness, wear resistance, and corrosion resistance of alumina make Goodfellow's alumina tubes well suited for use in equipment for semiconductor manufacturing, glass manufacturing, and other high-temperature industrial processes. The precise dimensions and reliable quality of the alumina tubes also make them useful for scientific instrumentation and experimental research apparatuses.
Tolerances
Tube
| Outside Diameter | =<2mm | ±10% |
|---|---|---|
| Outside Diameter | =<5mm | ±10% |
| Outside Diameter | >5mm | ±10% |
| Wall Thickness | ±20% |
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 |