After working in the high-temperature kiln industry for more than ten years, I have observed one thing: when many purchasing and technical personnel select integrated furnace bricks, the first thing they are most accustomed to asking is - 'What is the content of aluminum oxide (Al₂O₃)?' 68%, 75%, 80%...the higher the number, the more secure it seems. But to be honest, choosing a brick based on its Al₂O₃ content is like buying a car based only on its engine displacement. Large displacement does not necessarily mean stable running, and high content does not necessarily mean durability. Today we will talk about, in addition to the composition report, when choosing integrated furnace bricks in 2026, you should also look at several more critical indicators.

In the final analysis, the selection of lining materials for copper smelting furnaces is to withstand high temperatures, resist slag erosion, and withstand the thermal shock caused by frequent temperature fluctuations. Magnesia-chromium bricks not only have excellent high temperature and pressure resistance, but also have outstanding slag corrosion resistance. They also have excellent thermal stability. With multiple advantages, they have naturally become the mainstream material for flash furnaces and reverberatory furnace linings.

People literally understand unshaped refractory materials, that is, refractory products that do not have a fixed shape like standard brick refractory bricks. There is no clear distinction between shape and type in a typed or literal sense. Common unshaped refractory materials are: castables, refractory mud, refractory cement, refractory soil, etc. What they all have in common is that they are all powdered and have no fixed shape. They can be applied to the surface of the kiln, where it can fill gaps in the masonry.