The maximum temperature of plug brick varies with the material and production process. According to the search results, the following are several common types of plug bricks and their maximum service temperatures:

I. High alumina plug brick:

High-alumina plug bricks have high fire resistance and can usually withstand temperatures above 1700℃. For example, the fire resistance of LZ-75 brand high alumina brick can reach 1790℃.

II. ALO-SiO-C impregnated plug brick:

This type of plug brick shows good high temperature resistance in practical use, and the highest service temperature can reach 1500℃.

III. Aluminum silicate plug brick:

Its temperature range is wide, and it can withstand the highest high temperature of 1200℃.

IV. Corundum plug brick:

Corundum plug brick has excellent corrosion resistance and erosion resistance, and its maximum service temperature can reach above 2000℃.

It should be noted that the actual service temperature of the plug brick is also affected by many factors such as specific working conditions, service frequency and cooling conditions. In practical application, the appropriate plug brick type should be selected according to the specific needs, and the operation and maintenance should be carried out in strict accordance with the technological requirements to ensure its performance and service life.