Refractory Fire Clay Brick

Item

SK-30

SK-32

SK-34

SK-36

SK-38

AL₂O₃ %   (min)

30-35%

35-38%

38-42%

50-55%

60-65%

Fe₂O₃%   (max)

3

3

2.8

2.5

2.3

Refractoriness

≥1670°C

≥1690°C

≥1710°C

≥1750°C

≥1770°C

Refractoriness under load, 0.2MPa, (°C)

≥1270°C

≥1350°C

≥1350°C

≥1430°C

≥1450°C

Apparent porosity (%)

20-24

20-24

19-23

18-22

18-22

Bulk density (g/cm³)

2.00-2.05

2.05-2.1

2.1-2.15

2.15-2.25

2.25-2.35

Cold crushing strength (MPa)

≥25

≥30

≥35

≥45

≥50

Thermal expansion at 1000°C (%)

≤0.6

≤0.55

≤0.55

≤0.4

≤0.4