The cost difference between low porosity clay brick and ordinary clay brick is mainly reflected in the following aspects:

I. Cost of raw materials

Low porosity clay brick: Generally, it is necessary to use higher quality raw materials, such as super-calcined flint clay and calcined bauxite, and add flint clay to the raw material ratio to reduce porosity and improve density and erosion resistance. The cost of these high quality raw materials is relatively high.

Ordinary clay brick: ordinary refractory clay is mainly used as raw material, and the cost is relatively low.

II. Cost of production process

Low porosity clay brick: high pressure forming and high temperature sintering process are adopted, and the sintering temperature is usually higher to ensure the low porosity and high density of the brick body. The energy consumption and equipment cost of this process are high.

Ordinary clay brick: the production process is relatively simple, and the semi-dry high-pressure forming process is usually adopted, with low sintering temperature and relatively low energy consumption and equipment cost.

III. Cost of quality control

Low porosity clay brick: The requirements for raw material selection and quality control are stricter to ensure the purity and quality of the brick body, which increases the cost of quality control.

Ordinary clay brick: the quality control requirements are relatively low, and the cost is also low.

IV. Service life and maintenance cost

Low porosity clay brick: the service life is 2 to 3 times longer than that of ordinary clay brick, which reduces the replacement frequency of refractory materials, thus reducing the long-term maintenance cost.

Ordinary clay brick: It has a short service life and needs to be replaced more frequently, which increases the maintenance cost.

V. Market price

Low porosity clay brick: Because of its high performance and high cost, the market price is usually higher. For example, the unit price of low porosity clay brick is about 2100 yuan/ton.

Ordinary clay brick: the market price is relatively low, usually around 1200 yuan/ton.

VI. Comprehensive cost

Although the initial cost of low porosity clay brick is high, it has high economy in the long run because of its long life and low maintenance cost. Although the initial cost of ordinary clay brick is low, it needs to be replaced more frequently because of its short service life, and the long-term use cost may be higher.

To sum up, the cost of low porosity clay brick is high in raw materials, production technology and quality control, but its long life and low maintenance cost make it more economical in long-term use.