Brand	Fire-clay
Item	DRN-125(XX)	DRN-120(X)	DRN-115(N43)
Al2O3   %	≥42	≥39	≥40
Bulk Density g/cm3	≥2.25	≥2.2	≥2.2
Apparent Porosity %	≤20	≤22	≤24
Cold Crushing Strength MPa	≥35	≥35	≥30
0.2MParefractoriness under load	≥1450	≥1400	≥1400
Linear Change after heating%	1400℃*4h	1400℃*4h	1350℃*2h
	+ 0.2	+ 0.2	+ 0.2
creep（0.2MPa）%	1250℃*(20-50)h	1250℃*(20-50)h	150℃*50h
	≤0.2	≤0.2	≤0.8
Refractoriness ℃	≥1750	≥1730	≥1730