Ultra low cement refractory castables are high-performance refractory materials developed on the basis of low cement refractory castables. The amount of aluminate cement is generally 2.5%~5%, and its performance is better than that of low cement refractory castables.
Ultra low cement refractory castables have significantly reduced cement content, combined with special binders and high-quality aggregates, and have the characteristics of low porosity, high strength, and good thermal shock resistance. They are ideal for various high-temperature industrial applications.
| Item | Concreto de cimento ultra-baixo | |||
|---|---|---|---|---|
| Material | Clay | High Alumina | Corundum | |
| Bulk Density (g/cm3) | 2.35 | 2.7 | 3.2 | |
| Al2o3(%) | 45 | 75 | 95 | |
| Cao(%) | 1.15 | 1.15 | 1.15 | |
| Flexural Strength(Mpa) | 110℃*16h | 6 | 6 | 8 |
| 1500℃*3h | 8 | 8 | 10 | |
| Compressive Strength(Mpa) | 110℃*16h | 40 | 40 | 60 |
| 1500℃*3h | 70 | 800 | 90 | |
| Line change rate after burning(%) | 110℃*16h | -0.1 | 0 | 0 |
| 1500℃*3h | -0.5 | -0.5 | -0.5 | |
| Refractoriness | ℃ | 1710 | 1790 | 1790 |
| Safe Service Temperature | ℃ | 1400 | 1450 | 1650 |
1.Low cement content, which cuts down heat shrinkage; 2.High strength for better durability; 3.Low porosity to resist penetration; 4.Excellent thermal shock resistance for harsh high – temp use.
Ultra low cement castables are widely used in steel – making ladles, glass – melting furnaces, and cement rotary kilns, where they withstand high temperatures, thermal shock, and mechanical stress.