Refractory bricks for use in furnace kilns

International code name

SK35

SK36

SK37

SK38

SK40

Al2O3/%

≥48

≥55

≥65

≥75

≥80

Fe2O3/%

≤2

≤2

≤2

≤2

≤2

Refractoriness

≥1750 °C

≥1770 °C

≥1790 °C

≥1790 °C

≥1790 °C

Apparent porosity

≤22%

≤22%

≤23%

≤23%

≤21%

Cold crushing strength

≥39Mpa

≥44Mpa

≥49Mpa

≥54Mpa

≥65Mpa

Refractoriness under load (0.2MPa)

≥1420 °C

≥1470°C

≥1500 °C

≥1520 °C

≥1530 °C

Reheating ange (1500°C 2h) %

+0.1~ -0.4*1450°C

+0.1~ -0.4

+0.1~ -0.4

+0.1~

-0.4

+0.1~ -0.4