The core performance indicators of fire-resistant balls include:

Fire resistance (usually ≥1750℃)

Compressive strength (ability to resist compression at high temperatures)

Thermal shock stability (ability to resist sudden changes in temperature)

Chemical stability (ability to resist corrosion by acids and alkalis)

Bulk density (affects the efficiency of heat storage)

When choosing and purchasing, you need to check third-party test reports and pay attention to the purity of the raw materials (e.g., alumina content of ≥92%) and the production process (isostatic molding is used or not). The following is a list of the most popular products in the market.

Different types of refractory castables have different temperature ranges:

Low Cement Castables (LCC): 1400°C~1600°C

High Alumina Castables: 1600°C~1800°C

Corundum Castables: 1800°C~1900°C

Silicon Carbide Castables: 1600°C~1800°C (for reducing atmosphere)

The temperature range of lightweight insulation bricks varies with different materials, and the common types are as follows:

Diatomaceous earth bricks: 900°C~1100°C

High-alumina lightweight bricks: 1200°C~1400°C

Mullite lightweight bricks: 1400°C~1600°C

Alumina hollow sphere bricks: 1600°C~1800°C

Fused zirconia corundum bricks have superb corrosion resistance: the addition of zirconia (33%-41%) significantly improves the resistance to glass liquid and chemical slag erosion, especially suitable for melting pools and flow holes in glass kilns.

High refractoriness: the use temperature can reach over 1750℃, and the structure is stable under long-term high temperature environment.

Low porosity: the electrofusion process makes the bricks dense with low porosity (<1%), reducing the risk of melt penetration. Thermal shock resistance: not easy to crack under rapid temperature change, adapt to the frequent start and stop of industrial kilns.

Corundum brick takes alumina (Al₂O₃≥90%) as the core component, and its performance is significantly better than that of ordinary high alumina bricks:

Ultra-high-temperature resistance: the long-term use temperature is up to 1700-1800 ℃, which is far more than that of the LZ-75 high alumina bricks (1600-1650 ℃);

Extremely dense: bulk density ≥3.2g/cm³, apparent porosity <15%, and the resistance to slag penetration is improved by more than 50%; Mechanical strength: Normal temperature compressive strength ≥80MPa, abrasion resistance is 3-5 times of high alumina bricks.