Inquiry
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Alumina Tube
High Purity Alumina Tube, 99.6% Al2O3 Ceramic Tube
High purity alumina tubes can withstand very high temperatures under reducing, inert or high vacuum conditions. They remain good chemical resistance under high temperatures and have excellent wear and abrasion resistance. 99.6% Alumina tube can withstand up to 1800℃.
Our high purity alumina (Al2O3 content > 99%) ceramics are purpose-built to perform across a wide range of high-temperature applications. Our high purity alumina shows considerable resistance to chemical attack due to the lack of glassy phases that tend to determine corrosion resistance.
Alumina tubes can be used in a multitude of applications include:
- Turbine casting supports
- Surgical devices
- Knife sharpeners
- Wafer processing components
- Ceramic insulators
- Vacuum devices
- High-power resistor
- Thermocouple components
- Protection tubes
- Igniter tubes
- Thermostats
Alumina Tube Features
- Alumina purity: 99.6%
- Color: Ivory
- Sintering temperature: 1810℃
- Max. working temperature: 1800℃
- Sag Temp. Unsupported Tube: 1600℃
| Chemical Composition (%) |
Al2O3 | >99.6 |
| SiO2 | <0.1 | |
| Fe2O3 | <0.05 | |
| R2O | <0.1 |
Alumina Tube Standard size
| OD x ID x Length (mm) | |
| 28 x 22 x 200-1500mm | 30 x 24 x 200-1500mm |
| 32 x 26 x 200-1500mm | 35 x 28 x 200-1500mm |
| 40 x 30 x 200-1500mm | 50 x 40 x 200-1500mm |
| 60 x 50 x 200-1500mm | 70 x 60 x 200-1500mm |
| 80 x 70 x 200-1500mm | 90 x 80 x 200-1500mm |
| 100 x 90 x 200-1500mm | 120 x 110 x 200-1500mm |
*Other sizes can be produced according to your requirement.
Note: Alumina products are sensitive to thermal shock. Try to warm up the furnace chamber slowly. A heating rate between 150℃~300℃/hour is recommended for the first 1-1.5 hours so that the alumina products can be evenly heated to reduce the impact of thermal shock.
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Performance |
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Item |
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Unit |
95 Al2O3 |
96 Al2O3 |
99 Al2O3 |
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Physical Characteristics |
Bulk density |
g/cm3 |
3.6 |
3.6 |
3.9 |
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Water absorption |
% |
0 |
0 |
0 |
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Mechanical Characteristics |
Flexural strength |
Mpa |
320 |
340 |
360 |
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Hardness Vickers |
Gpa |
12.2 |
13.5 |
15.6 |
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Elastic modulus |
Gpa |
280 |
320 |
370 |
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Poisson’s ratio |
- |
0.22 |
0.23 |
0.23 |
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Thermal Characteristics |
Linear expansion coefficient |
(200C-5000C) 10-6/0C |
7.1 |
7.2 |
8 |
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Thermal conductivity |
w/(m.k) |
16 |
24 |
32 |
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Specific Heat |
*10-3J/(kg*K) |
0.78 |
0.78 |
0.9 |
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Electrical Characteristics |
Dielectric constant (1MHZ) |
- |
9 |
9.4 |
9.9 |
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Dielectric loss angle |
*10-4 |
15 |
5 |
1 |
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Dielectric strength |
*106V/m |
12 |
15 |
15 |
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