When it was discovered that the addition of highly reactive volatilised or fume silica to a castable would dramatically change the physical properties, a new family of castables was discovered -known as Low Cement Castables LC – Castables.
These dense strong refractory castables, based on the use of low Calcium Aluminates Cement content, have replaced many conventional castables, plastics, ramming and gunning mixes and are used in many applications that require high refractoriness, corrosion resistance and abrasion resistance.
- LC castables possess a uniform structure with low porosity.
- Conventional Castables looses strength drastically at interim temperature – between 800 to 1100 C
- Low Cement Castables develops progressively higher strength even at interim temperature
Typical Value of Low Cement Castables:
| CORROREF™ LC 45 | CORROREF™ LC 60 | CORROREF™ LC 70 | CORROREF™ LC 90 | |
| Service Temperature C | 1550 | 1600 | 1600 | 1700 |
| Alumina Al203 | 45 | 60 | 70 | 88 |
| Bulk Density BD gm/cm3 | 2.3 | 2.5 | 2.6 | 3.05 |
| Water Required for mixing % | 5.7-6.2 | 5.5-6 | 4.5-5 | 4-5 |
| CCS kg/cm2 at 110 °C | 650 | 700 | 700 | 900 |
| CCS kg/cm2 at 1100 °C | 850 | 880 | 880 | 1000 |
| CCS kg/cm2 at 1500 °C | 1000 | 1000 | 1000 | 1100 |