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a. Fused Alumina Cement |
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Al2O3 |
CaO |
Fe2O3 |
SiO2 |
Moisture |
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79%-82% |
18%-20% |
0.2% Max. |
0.3% Max. |
0.5% Max |
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Refractoriness (SK): 37Min. |
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Initial Setting Time: 15 minutes Min. |
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Final Setting Time: 6 Hours Max. |
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Bending Strenght(1day) 25Mpa Min. |
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Compressive Strength (1 day) 4 Mpa Min. |
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Fineness: 96% Min through 0.8mm. |
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b. From Bauxite |
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Type Compostion |
Type A |
Type B |
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A500 |
A700 |
DF925 |
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SiO2 |
% |
≤10 |
≤5.5 |
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Al2O3 |
% |
≥50 |
≥54 |
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CaO |
% |
≤33 |
≤33.5 |
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Fe2O3 |
% |
≤3.0 |
≤2.5 |
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Physical Properties |
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0.08mm Residue |
% |
≤10 |
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Initial Setting Time |
(H:M) |
＞0：40 |
＞1:30 |
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Final Setting Time |
(H:M) |
＜6:00 |
＜6:00 |
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Bending Strength |
(1 day) Mpa |
5.0 |
7.0 |
8.0-90. |
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(3day) Mpa |
5.5 |
7.5 |
10.0-11.0 |
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Compressive strength |
(1 day) Mpa |
46 |
66 |
80-90 |
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(3day) Mpa |
52 |
72 |
90-100 |
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c. From Aluminium Oxide |
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Type Compostion |
A70-1 |
A70-2 |
A80-1 |
A80-2 |
A90 |
A80-3 |
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SiO2 (%) |
≤1.0 |
≤0.3 |
≤0.4 |
≤0.25 |
≤0.2 |
≤0.4 |
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Al2O3 (%) |
≥70 |
≥70 |
≥77 |
≥79 |
≥88 |
≥77 |
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CaO (%) |
≤30 |
25-29 |
≤22 |
≤20 |
≤10 |
≤22 |
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Fe2O3 (%) |
≤1.0 |
≤0.3 |
≤0.5 |
≤0.2 |
≤0.2 |
≤0.5 |
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Physical Properties |
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0.08mm Residue (%) |
2.5 |
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Initial Setting Time (H:M) |
＞0:30 |
＞0:20 |
＞0:30 |
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Final Setting Time (H:M)v |
＜6:00 |
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Bending Strength (6Hrs) Mpa |
＞2.0 |
＞1.0 |
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Bending Strength (1day) Mpa |
＞5.0 |
＞4.0 |
＞2.5 |
＞4.0 |
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Compressive strength (6Hrs) Mpa |
＞10 |
＞50 |
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Compressive strength (1day) Mpa |
＞40 |
＞20 |
＞10 |
＞20 |
