Mullite

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The mullite is a top-quality refractory material, featuring homogeneous expansion, great thermal shock resistance, high load softening point, small high-temperature dislocation creep, excellent corrosion resistance, etc. The artificial refractory material is applicable for inner liners of various kilns and electric furnaces.

The two major methods to make mullite are electric smelting (high-temperature electric smelting in electric arc furnace) and sintering (high-temperature sintering in tunnel kiln).

Note: sintered mulltie is classified into bauxite-based sintered mulltie and alumina-based high-purity sintered mulltie.

Technical Indicators of Electric Smelting Mullite

Product number		SC-FM70	SC-FM75
Chemical composition %	Al2O3	70-74	74-77
	SiO2	25-28	22-25
	Fe2O3	0.1max	0.1max
	K2O Na2O	0.5max	0.5max
	CaO	0.3max	0.3max
Mullite phrase content (%)		95min
Glass phrase content (%)		5max
Linear expansion coefficient(1/ºC )		-6.0*10 -6
True specific gravity		3.2min
Refractoriness (ºC)		1840min
Grain size of section sand(mm)		0-1/1-3/3-5...
Powder(mesh)		-200 -325...

Technical Indicators of Bauxite-Based Sintered Mullite

Product number	Chemical composition (%)				Water absorbing capacity (%)	Bulk density (g/cm3)
Product number	Al2O3	SiO2	Fe2O3	R2O	Water absorbing capacity (%)	Bulk density (g/cm3)
MS70	68-73	22-28	≤1.2	≤0.3	≤3.0	≥2.8
MS60	58-62	28-33	≤1.1	≤0.3	≤3.0	≥2.6
MS45	42-45	53-55	≤0.4	≤1.6	≤3.0	≥2.5

Technical Indicators of Alumina-Based High-Purity Sintered Mullite

Product number	Chemical composition (%)				Apparent porosity (%)	Bulk density (g/cm3)
Product number	Al2O3	SiO2	Fe2O3	R2O	Apparent porosity (%)	Bulk density (g/cm3)
XMS75	≥75	21-24	≤0.5	≤0.3	≤3.0	≥2.85
XMS70	70-73	26-29	≤0.5	≤0.3	≤3.0	≥2.80
XMS60	58-61	38-41	≤0.5	≤0.3	≤4.0	≥2.70

Related Names
Fused Mullite | Refractory Material

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