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  | alkali-resistant brick  | High-strength alkali resistant brick  | Arch alkali resistant brick  | ||
XNJ-30  | XNJ-30G  | XNJ-35D  | |||
Al2O3 %   | 25-30  | 25-30  | 30-35  | ||
| SiO2 % | 60-70  | 60-70  | |||
| Fe2O3 ≤% | 2  | ||||
Apparent porosity  | 25  | ||||
Cold crushing strength≥MPa  | 35  | 70  | 40  | ||
Bulk density≥g/cm3  | 2.1  | 2.2  | 2.2  | ||
Linear change after heating 1200℃*2h%  | +0.2~-0.2  | +0.15~-0.15  | +0.15~-0.15  | ||
Refractoriness>℃  | 1650  | 1650  | 1700  | ||
Refractoriness under load≥℃  | 1230  | 1250  | 1280  | ||
Thermal shock resistances water cycle  | 10  | -  | -  | 
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China Wuxi Yatai Furnac-klin Co.,Ltd.