Zero Expansion Silica Bricks for Hot Repair.

Brand Item			SFS-1	SFS-2	SFS-3
Chemical Composition	SiO2	%	≥97	≥98	≥98.5
	AL2O3	%	≤0.3	≤0.2	≤0.16
	Fe2O3	%	≤0.5	≤0.4	≤0.3
	CaO	%	≤0.1	≤0.1	≤0.1
Bulk Density		g/cm3	≥1.75	≥1.80	≥1.84
Apparent Porosity		%	≤22	≤20	≤18
CCS		MPa	≥20	≥25	≥30
Refractoriness		℃	≥1500	≥1600	≥1650
Permanent Line Shrinkage(1300℃×12h)		%	≤0.2	≤0.2	≤0.2
The coefficient of thermal expansion (20～800℃)		%	≤0.19	≤0.19	≤0.17

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