The index of Alumina cement
Aluminate cement	CA40-Fused	CA50-J5	CA50-J6	CA50-J7	CA50-N	CA50-J9	CA50-Fused
Blaine (cm2/g)	≥2700	≥3000	≥3000	≥3000	≥3000	≥4000	≥4000
Initial time(h:m)	≥0:40	≥0:30	≥0:30	≥0:30	≥0:30	≥1:30	≥2:00
Final time(h:m)	≤4:00	≤6:00	≤6:00	≤6:00	≤6:00	≤6:00	≤6:00
Flexural strength(Mpa)	6hrs≥4.0						≥4.0
1 day	≥5.5	≥5.5	≥6.0	≥6.5	≥6.0	≥8.0	≥10.0
3 days	≥6.5	≥6.5	≥7.0	≥7.5	≥7.0	≥10.0	≥11.0
Compressive strength	6hrs≥30.0						≥35.0
1 day	≥50.0	≥40.0	≥45.0	≥50.0	≥50.0	≥70.0	≥75.0
3 days	≥60.0	≥50.0	≥55.0	≥60.0	≥60.0	≥80.0	≥85.0
Chemical composition
SiO2 %	≤6.0	≤8.0	≤8.0	≤8.0	≤6.5	≤6.0	≤5.0
Al2O3 %	≥37.0	≥50.0	≥50.0	≥51.0	≥50.0	≥53.0	≥50.0
CaO %	≤38.0	≥33.0	≥33.0	≥33.0	≥33.0	≥33.5	≤38.0
MgO %	≤1.5	≤1.5	≤1.5	≤1.5	≤1.5	≤1.5	≤1.5
TiO2 %	≤3.0	≤3.0	≤3.0	≤3.0	≤3.0	≤3.0	≤3.0
Fe2O3 %	≤18.0	≤3.0	≤3.0	≤2.5	≤3.0	≤2.5	≥50.0