Model  | RK-0  | RK-H  | RK-A  | CB-20  | 
Al2O3(%)  | ≥25-30  | ≥25-30  | ≥30-35  | ≥25-30  | 
SiO2(%)  | ≥60-67  | ≥65-70  | ≥60-65  | ≥60-67  | 
Fe2O3(%)  | ≤2.0  | ≤2.1  | ≤2.2  | ≤2.0  | 
Apparent porosity(%)  | ≤25  | ≤20  | ≤25  | ≥30  | 
Refractoriness(℃)  | 1650  | 1650  | 1700  | 1650  | 
Normal temperature compressive strength(Mpa)  | ≥25  | ≥60  | ≥40  | ≥15  | 
softening temperature under load ℃(0.2MPaⅹ0.6%)  | ≥1350  | ≥1200  | ≥1400  | ≥1250  | 
Thermal Conductivity W/m.k (350±10℃)  | ≤1.28  | ≤1.28  | ≤1.28  | ≤0.7  | 
Thermal shock stability, times(1100℃,cooling water)  | ≥10  | ≥25  | ≥10  | ≥5  | 
Reburn line changes(1350℃ x 2h)  | 0.1%-1.0%  | -  | -  | -  | 
| Ansprechpartner : | Elizabeth | 
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