product Index | unit | magnesia brick | magnesia-alumina brick | magnesia zircon brick | magnesite-chrome brick | |||||||
MZ-92 | MZ-95 | MZ-97 | MZ-80A | MZ-80B | MG-1 | MG-2 | MGZ-12 | MGZ-9 | MGZ-6 | MGZ-4 | ||
MgO ≥ | % | 92 | 95 | 97 | 80 | 80 | 73 | 77 | 60 | 70 | 75 | 80 |
CaO ≤ | % | 2.5 | 2.0 | 2.0 | — | — | — | — | — | — | — | — |
Al2O3 ≥ | % | — | — | — | 5-10 | 5-10 | — | — | — | — | — | — |
SiO2 ≤ | % | 4.0 | 2.0 | 1.0 | — | — | — | — | 3.2 | 3.0 | 2.8 | 2.5 |
ZrO2 ≥ | % | — | — | — | — | — | 12 | 12 | — | — | — | — |
Cr2O3 ≥ | % | — | — | — | — | — | — | — | 12 | 9 | 6 | 4 |
Apparent porosity≤ | % | 18 | 18 | 18 | 18 | 20 | 18 | 16 | 19 | 19 | 18 | 18 |
Cold crushing strength MPa≥ | Mpa | 60 | 60 | 60 | 40 | 30 | 65 | 70 | 35 | 40 | 40 | 40 |
0.2MpaRefractoriness under loads≥ | ℃ | 1600 | 1600 | 1700 | 1600 | 1580 | 1600 | 1660 | 1580 | 1600 | 1600 | 1600 |
linear changes on reheating 1650℃x2h | % | +0 -0.5 | +0 -0.3 | +0 -0.2 | — | — | — | — | — | — | — | — |
Bulk density ≥ | g/cm3 | 2.88 | 2.9 | 3.0 | 2.8 | 2.8 | 3.0 | 3.1 | 3.0 | 2.98 | 2.95 | 2.93 |
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