Dense Refractory Castable


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Product Description

High-alumina castable is a refractory material formulated with high-alumina bauxite clinker as the main raw material, combined with appropriate binders and additives. Its key characteristics include high refractoriness, excellent high-temperature mechanical strength, good thermal shock resistance, and strong resistance to chemical corrosion. It can be directly mixed with water for casting and molding, offering strong adaptability and controllable porosity.

Feature

· Good workability

· Good resistance to chemical attack

· High bonding strength

· Low drying and firing shrinkage

· Good slag resistance and thin masonry joints

Application

This material is widely used in high-temperature industrial fields such as metallurgy, building materials, and electric power.
In the metallurgical industry, it is used as lining and insulation for blast furnaces, converters, and ladles.
In the building materials industry, it is suitable for critical areas such as the burning zone of cement rotary kilns and regenerators of glass furnaces.
In the electric power sector, it is applied to boiler combustion chamber linings and checker brick linings of hot blast stoves.
In addition, it is ideal for lining construction of various heat treatment furnaces and heating furnaces, meeting high-temperature service requirements under different operating conditions.

Parameter Control

Index Products		Unit	High-alumina Castable Series
Index Products		Unit	CT A-50	CT A-55	CT A-60	CT A-65	CT A-70	CT A-75
Al2O₃		%	≥50	≥55	≥60	≥65	≥70	≥75
Fe2O3		%	≤3.0	≤3.0	≤2.8	≤2.0	≤2.0	≤2.0
Bulk density ≥		g/cm³	≥2.2	≥2.25	≥2.3	≥2.4	≥2.5	≥2.6
Modulus of rupture ≥	110℃*24h	MPa	≥5	≥5	≥5	≥6	≥7	≥7
	1100℃*3h		≥4	≥6	≥6	≥7	≥7	≥7
	1350℃*3h		_	_	_	≥7	≥8	≥8
Cold crushing strength ≥	110℃*24h	MPa	≥35	≥35	≥40	≥40	≥40	≥40
	1100℃*3h		≥30	≥40	≥40	≥60	≥60	≥60
	1350℃*3h		—	—	—	≥60	≥60	≥60
Reheating linear change	1100℃*3h	%	±0.5	±0.5	±0.5	±0.5	±0.5	±0.5
Reheating linear change	1350℃*3h	%	—	—	—	±0.5	±0.5	±0.5
Thermal Conductivity At 600℃		W/m.k	≤1.8	≤1.8	≤1.8	≤1.8	≤2.2	≤2.2
Recommended Maximum Service Temperature		℃	1300	1350	1350	1350	1350	1400
Application Method		casting