unshaped refractory
Chemically-Bonded Castable
Chemically-bonded castable = cement-free; it does not harden by hydration but cures and solidifies through chemical reactions between chemical binders such as phosphoric acid, aluminum dihydrogen phosphate, water glass, resin and sulfates and the aggregate/powder materials.
| Grade | Al₂O₃ Content | Long-term Service Temp. | Typical Applications |
| Phosphate-bonded | ≥70% | 1450-1550℃ | Kiln mouths, discharge pipes, furnace doors, burners, circulating fluidized beds, easy-spalling/scouring parts, and emergency repairs of kilns. |
| Water-glass-bonded | ≥65% | 1100℃ |