High-Alumina Ceramic Tube
High-alumina ceramic tube is made from high purity aluminum oxide – Al₂O₃. This tube handles high heat, blocks electricity, resists wear, and doesn't react with most chemicals. You see them in industrial furnaces, heating systems, and labs.
Danyang Dingfeng Industrial Furnace Co., Ltd. is one of the most reliable manufacturers and suppliers of high-alumina ceramic tube in China. If you're going to wholesale durable high-alumina ceramic tube made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Product Definition
High-alumina ceramic tube is made from high purity aluminum oxide – Al₂O₃. This tube handles high heat, blocks electricity, resists wear, and doesn't react with most chemicals. You see them in industrial furnaces, heating systems, and labs.
Working Principle
The tube is a barrier. The dense crystalline structure – mostly corundum phase – keeps the outside out. Put a thermocouple or heating element inside the tube, and the tube protects it from the furnace atmosphere. No oxidation, no corrosion, no slag sticking to it.
At the same time, the tube conducts heat well enough that the thermocouple still reads accurately. You don't lose much temperature through the wall.
Features
- High heat resistance. These high-alumina ceramic tubes run at high temperature for a long time without getting brittle or warping. A 99% alumina tube can run at 1700°C continuously.
- Hard and wear resistant. The material is hard. It doesn't wear down from abrasive gases or particles passing over it. In a fluidized bed furnace, a high-alumina tube lasts years. A steel tube would be gone in weeks.
- Good electrical insulation. Alumina is an electrical insulator. You can run a heating element inside it without shorting out. And it resists acids, alkalis, and other aggressive chemicals.
Applications
Industrial furnaces
Annealing, tempering, sintering, carburizing, vacuum furnaces. Anywhere you need to protect a sensor or pass something hot through a wall.
Temperature measurement
Thermocouple protection tubes, sensor sheaths, instrument guards. These are probably the most common use.
Electric heating gear
Support high-alumina ceramic tubes for heating elements. Insulation sleeves. Furnace accessories.
Metallurgy
Testing the temperature of molten metal. You dip a thermocouple in a ceramic tube into the melt.
Lab equipment
High temperature furnaces, analytical instruments, thermal testing devices.
Semiconductor and electronics
Insulation parts for high temperature process equipment.
Customization
Dingfeng Industrial Furnace. We build to your needs.
- 95% alumina tube – good for most work, cheaper
- 99% alumina tube – higher temperature, better chemical resistance
- Closed end design – one end sealed
- Multi-bore design – several holes through the tube
- Custom dimensions – diameter, length, wall thickness
- Precision machined surfaces – for better sealing or fit
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