The fire resistance temperature of mullite thermal insulation brick is different due to specific composition, production technology and service conditions. According to the search results, the fire-resistant temperature range of mullite thermal insulation brick is roughly as follows:

I. Long-term service temperature:

The long-term service temperature of mullite insulation brick is usually between 1350℃ and 1600℃. The long-term service temperature of some high-purity or specially treated products can reach 1650℃.

II. Short-term fire resistance temperature:

In short-term use or emergency situations, mullite insulation bricks can withstand higher temperatures, up to 1770℃.

III. Fire resistance limit:

The fire resistance limit of some mullite insulation bricks can reach 5.3 hours, which shows that they can still maintain structural integrity under extreme high temperature conditions.

The fire resistance of mullite thermal insulation brick mainly depends on its composition and structure. Mullite (3Al₂O₃·2SiO₂) is its main component, which has high melting point and low thermal expansion coefficient, which makes the brick body stable at high temperature. In addition, mullite thermal insulation brick also has a low thermal conductivity (usually 0.15 ~ 0.35 W/(m k) at room temperature), which can effectively insulate heat in high temperature environment and reduce heat loss.

In practical application, mullite insulation bricks are widely used as lining materials for high-temperature furnaces, such as steel, glass, ceramics and other industries, which can significantly improve the thermal efficiency of furnaces and reduce energy consumption.