Brand	Alkali-resistant brick	High-strength alkali resistant brick	Arch alkali resistant brick
Item	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	-	-