Item

High alumina brick

LZ-55

LZ-65

LZ-75

Chemical composition

Al2O3, %

≥55

≥65

≥75

Fe2O3, %

≤1.8

≤1.6

≤1.5

Bulk density, g/cm3

2.35

2.5

2.65

Refractoriness, °C  

≥1770

≥1790

≥1790

Refractoriness under load, °C , (0.2Mpa 0.6%)

≥1420

≥1470

≥1520

Apparent porosity, %

≤23

≤23

≤22