Fire Clay Bricks

Fire clay brick
the main chemical components: al2o3 content is 30%-48%, sio2 content is 50%-65%, and a small number of alkali metals, metal oxides, etc. Mineral composition is usually mullite, quartz and glass phase. Its refractoriness is 1580-1750 °c, refractoriness under load is 1250-1450 °c, with good thermal resistance and strong ability to resist acid slag.
Fire clay bricks is used for lower parts of regenerators, hot blast stove, furnaces of metallurgic, building material, glass, ferrous metal and so on.
technical specifications:
item index
sk-30 sk-32 sk-34 sk-35
al2o3 % (≥) 30 35 38 45
fe2o3 % (≤) 2.5 2.5 2.0 2.0
refractoriness(sk) 30 32 34 35
refractoriness under load, 0.2mpa, (°c ) 1250 1300 1350 1400
apparent porosity (%) 22-26 22-26 20-24 20-22
bulk density (gcm³) 1.9-2.0 1.95-2.1 2.1-2.2 2.15-2.22
cold crushing strength (mpa) 20 25 25 30
thermal expansion at 1000°c (%) 0.8 0.6 0.6 0.5