Item

Specification

Test method

Physical property

Refractoriness           

≥1710

GB/T7322-87

Bulk density          g/cm³

≥2.1

GB/T2997-82

Aparant porosity         %

≤20

GB/T2997-82

Cold crushing strength       MPa

≥30

GB/T5072-85

Refractoriness under load T_a      

≥1420

YB/T370-75

Acid resistance         %

≥98

GB8488-87

Permanent linear change1300×3h

≤+0.1

GB/T5988-86

Chemical property

Al₂O₃                  %

≥35

GB6900-86

SiO₂           %

≥58

GB6900-86

Item

Specification

Test method

Physical property

Refractoriness          

≥1530

Bulk density         g/cm³

≥2.05

GB2997-82

Apparent porosity         %

≤12

GB2977-82

Cold crushing strength      MPa

≥50

GB5072-85

Thermal shock resistance 1100 to 20water cool  times

≥6

Acid solubility         %

≤1

Water absorbsion           %

≤6

Chemical property

Al₂O₃             %

≥25

GB6900-86

SiO₂             %

≥65

GB6900-86