High-temperature wools, also known as refractory or thermal insulation wools, are fibrous materials designed to provide excellent thermal insulation at elevated temperatures. They are commonly used in various industrial applications where high temperatures are present, such as furnaces, kilns, boilers, and other heat-processing equipment. These wools offer high thermal resistance, low thermal conductivity, and excellent resistance to thermal shock.

The most common types of high-temperature wools include:

1. Ceramic Fiber Wool: Ceramic fiber wool is made from alumina-silicate or other refractory oxide fibers. It can withstand temperatures up to 2300°F (1260°C) or higher, depending on the grade. Ceramic fiber wool is lightweight, flexible, and offers excellent thermal insulation properties, making it suitable for use in high-temperature applications such as furnace linings, kiln insulation, and pipe insulation.

2. Alumina Fiber Wool: Alumina fiber wool is made from high-purity alumina-silicate fibers and offers even higher temperature resistance than ceramic fiber wool, with some grades capable of withstanding temperatures up to 3000°F (1650°C) or more. It is used in demanding applications where extreme temperatures and thermal stability are required, such as in aerospace and defense industries.

3. Silica Fiber Wool: Silica fiber wool, also known as quartz wool, is made from high-purity silica fibers. It can withstand temperatures up to 1800°F (982°C) and is often used in applications requiring high-temperature insulation and resistance to chemical corrosion, such as in glass manufacturing and laboratory equipment.

4. Mineral Wool: Mineral wool, also known as rock wool or slag wool, is made from molten rock or slag spun into fibers. While not as temperature-resistant as ceramic or alumina fiber wool, mineral wool can still withstand temperatures up to around 1000°C (1832°F). It is commonly used for thermal and acoustic insulation in buildings, industrial equipment, and appliances.

High-temperature wools offer several advantages, including low thermal conductivity, lightweight, ease of installation, and resistance to thermal shock and chemical corrosion. However, proper handling and safety precautions should be followed during installation and use to prevent exposure to airborne fibers, which can pose health risks if inhaled. Additionally, selecting the appropriate type and grade of high-temperature wool is crucial to ensure it meets the specific requirements of the application.