Testing the quality of refractory bricks usually requires testing of physical properties and chemical composition. Here are some common methods and indicators used to evaluate the quality and performance of refractory bricks:

Compressive Strength Test: Assess the mechanical strength of refractory bricks by measuring their compressive strength. This can be done by performing stress testing in a laboratory environment. Depending on the requirements of the application, refractory bricks usually have certain compressive strength requirements.

Refractory resistance test: The refractory resistance of refractory bricks refers to its ability to withstand high temperature environments. This can be assessed through thermal shock testing, which involves heating a sample to a high temperature and then cooling it quickly to see if the sample cracks or breaks. The refractory resistance of refractory bricks depends on its raw materials and manufacturing process.

Thermal conductivity test: The thermal conductivity of refractory bricks at high temperatures is very important for applications such as blast furnaces. Thermal conductivity testing can determine the thermal conductivity of refractory bricks. Lower thermal conductivity generally means better insulation properties.

Chemical composition analysis: The chemical composition of refractory bricks has an important impact on their performance and durability. Chemical composition analysis can determine the content of each element in refractory bricks, including major oxides and impurities. Common chemical analysis methods include spectroscopic analysis, chemical titration and X-ray fluorescence spectroscopy.

Structural and Appearance Inspection: By inspecting the appearance of refractory bricks, you can evaluate whether the surface quality, brick shape and size comply with code requirements. At the same time, it is also necessary to check whether the structure of the bricks is uniform and free of cracks or other defects.

These test methods are usually performed by specialized laboratories or certification bodies who have the relevant equipment and expertise. When purchasing refractory bricks, you can ask the supplier to provide relevant quality certificates or certification documents to ensure their qualifications.