| Item | CN-1 | CN-2 | CN-3 | CN-4 | CN-5 | |
|
Chemical composition(%) |
SiO2≥ | 95 | 96 | 96 | 97 | 90 |
| Al2O3≤ | 0.7 | 0.6 | 0.6 | 0.5 | 0.4 | |
| Fe2O3≤ | 0.5 | 0.5 | 0.4 | 0.4 | 0.8 | |
| Cold crushing strength (Mpa) | After firing at 1300℃×3h |
15 | 15 | 10 | 10 | 25 |
| Apparent porosity (%) | After firing at 1300℃×3h |
26 | 26 | 25 | 25 | 23 |
| Linear changing after burnt(%) | After firing at 1300℃×3h |
0～+1.6 | 0～+1.2 | 0～+1.0 | ||
| Bulk density (g/cm3) | After firing at 1300℃×3h |
2.0 | 2.0 | 2.1 | 2.1 | 2.2 |
| Refractoriness(℃) | 1630 | 1650 | 1650 | 1680 | — | |
| Max. grain size of aggregate(mm) | 5 | 4.5 | 4.5 | 4.2 | 4.2 | |
| Amount for construction(kg/m3) | 2300 | 2300 | 2300 | 2400 | 2400 | |
