Although clay refractory brick and ordinary clay brick are similar in name, there are significant differences in composition, performance and use. The following is a detailed comparison between the two:

I. Composition and preparation

Clay refractory brick: the main component is refractory clay, and the Al₂O₃ content is usually between 30% and 48%. Its production process includes calcining hard clay into mature material, mixing with soft clay, molding and high temperature sintering.

Ordinary clay brick: it is mainly made of ordinary clay, with low Al₂O₃ content, usually 25%-30%. Its preparation process is relatively simple, mainly through clay molding and sintering.

II. Performance

Clay refractory brick:

Fire resistance: 1580℃-1770℃.

Thermal shock resistance: good, able to withstand sharp changes in temperature.

Corrosion resistance: it has good corrosion resistance to acid slag and gas.

Load softening temperature: high, usually above 1300℃.

Ordinary clay brick:

Fire resistance: low, generally around 1000℃.

Thermal shock resistance: poor, not suitable for high temperature environment

Corrosion resistance: it has some resistance to acid corrosion, but it is not as good as refractory clay brick.

III. Uses

Clay refractory brick:

Widely used in lining of high temperature furnaces, such as blast furnace, hot blast stove, glass kiln, coke oven, etc.

Suitable for parts that need high temperature resistance, corrosion resistance and thermal shock resistance.

Ordinary clay brick:

Mainly used in the construction field, such as masonry walls, chimneys and so on.

It can also be used in some industrial furnaces with low temperature requirements.

IV. Economy

Clay refractory brick: Because of its high performance and complicated production process, the price is relatively high.

Ordinary clay brick: the price is lower and the economy is better.

V. Other differences

Clay refractory brick: it belongs to weakly acidic refractory material, and its resistance to alkaline substances is slightly poor.

Ordinary clay brick: slightly acidic, with certain resistance to acid erosion.

To sum up, clay refractory bricks are mainly used in high-temperature industrial environment, emphasizing fire resistance, corrosion resistance and thermal shock resistance; Ordinary clay bricks are more used in the construction field, and economy is its main advantage.