high alumina brick

High alumina brick is belong to silicon aluminate products with Al2O3 above 48%.it is mainly used in hot blast stove, blast furnace and EAf for steel making. Which has good thermal conductivity than fireclay brick
our general high alumina brick as follows:
Properties
LZ-75 LZ-65 LZ-55 LZ-48
Al2O3, ≥ %
75 65 55 48
Refractoriness, ≥, ℃
1790 1770 1750
0.2Mpa RUL, T0.6, ℃≥, ℃
1520 1500 1470 1420
Liner Change
1500℃×2h 0.1-0.4 0-0.2
Apparent porosity, ≤ %
23 22
CCS, ≥Mpa
53.9 49 44.1 39.2