Ceramic protective tubes are mainly used to protect thermocouples or temperature sensors in high-temperature environments. They can effectively isolate high temperatures, corrosive gases, and external mechanical damage, ensuring the stability of temperature measurement and extending service life.

Common materials are alumina ceramics (Al₂O₃) or other high-temperature ceramic materials, which have high hardness, high heat resistance and good chemical stability, making them suitable for applications in high-temperature furnaces, heat treatment equipment and industrial process temperature monitoring.

The ceramic material is sintered at high temperature to form a corundum structure, which has excellent high temperature resistance and corrosion resistance. It can be used in high temperature environments for a long time and provides good electrical insulation. It is a commonly used protective sheath material for thermocouples and high temperature sensing elements.

In addition, Guan Hui also provides customized ceramic protective tube services, which can produce different specifications such as outer diameter, inner diameter, length and alumina purity according to customer needs, and can be combined with single-end closure or other special designs to meet the needs of various industrial equipment and temperature measurement applications.

Product Features

01.Excellent high-temperature resistance

Ceramic protective tubes are typically made of high-purity alumina ceramic, which can withstand high-temperature environments and maintain stable structural properties, making them suitable for various high-temperature processes and industrial furnace equipment.

02.High hardness and wear resistance

Alumina ceramics have a corundum structure, high hardness and excellent wear resistance, which can effectively protect internal thermocouple elements and prevent damage caused by external environment or mechanical contact.

03.Excellent corrosion resistance

Ceramic materials are chemically stable and have good resistance to various corrosive gases and environments, allowing for long-term use in high-temperature and corrosive atmospheres.

04.Good electrical insulation

Ceramics have excellent electrical insulation properties, which can effectively isolate thermocouple signals from external environmental interference, thereby improving the stability and reliability of the temperature measurement system.

05.Smooth surface, oxidation resistant

The ceramic tube has a dense surface that is not easily oxidized. It is not prone to corrosion or contamination during long-term use and can maintain a stable protective effect.

Common Materials

• Alumina ceramics（Al₂O₃）
• Silicon carbide（SiC）

※ Different materials can be selected according to the actual operating temperature and environmental conditions, such as high-temperature furnaces or highly corrosive environments.

Standing Specifications

Guan Hui's ceramic protective tubes are available in a variety of sizes and lengths, with a closed-end design, and can be cut or customized to the required length.

Alumina content 95%

Alumina content 99.9%

Alumina content 99.7%

Alumina content 99.5%

※ The length can be made or cut to size as needed.

Application

Ceramic protective tubes are widely used in various high-temperature measurement and industrial equipment, such as:

• High-temperature furnace temperature measurement
• Heat treatment equipment
• Metallurgical and Metalworking Processes
• Industrial heating equipment
• Kiln and high-temperature reactor

※ Can be used with various thermocouples (K, R, S, B types) or high-temperature sensors.