| Items | NN-30 | NN-38 | NN-42 | NN-45A | NN45B |
| Refractoriness not less than ℃ | 1630 | 1690 | 1710 | 1730 | 1730 |
| AL2O3% Not less than | 30 | 38 | 42 | 45 | 45 |
| CMOR ≥MpaC 110℃ After drying | 1.0 | 1.0 | 1.0 | 1.0 | 2.0 |
| 1200℃×3hAfter burning | 3.0 | 3.0 | 3.0 | 3.0 | 6.0 |
| Refractoriness under load | 1200 | ||||
Linear variation rate % | 1200℃×3hAfter burning | 1~3 | |||
| 1300℃×3hAfter burning | 1~5 | ||||
| Bonding time min | 1~3 | ||||
Particle size % | -0.1mm | 100 | |||
| +0.5mm Not more than | 2 | ||||
| -0.074mmNot more than | 50 |
Remarks：A represents common fireclay refractory mortar,and B represents phosphate-bonded fireclay refractory mortar