High Alumina Brick

Item

HA60

HA70

HA75

HA80

AL2O3(%)

≥60

≥70

≥75

≥80

SIO2(%)

32

22

20

≥18

Fe2O3(%)

≤1.7

≤1.8

≤1.8

≤1.8

Refractoriness °C

1790

＞1800

＞1825

≥1850

Bulk density,g/cm3

2.4

2.45-2.5

2.55-2.6

2.65-2.7

Softening temperature under load

≥1470

≥1520

≥1530

≥1550

Apparent porosity,%

22

＜22

＜21

20

Cold Crushing strength Mpa

≥45

≥50

≥54

≥60