fire refractory brick

alumina hollow sphere brick 1.Alumina reach 99.4%,B.D.1.5g/cm3 2.competitive price,has ISO certificate 3.insulation,fireproof

alumina hollow sphere brick

1.Definition:

It is the thermal insulation and fire resistant product, which is mainly made of the alumina bubble  and powder.

2.Highlight:

1).Alumina contents ranging above 90%

2).High strength at common temperature (20°C).

3).Good thermal insulation Feature

4).Low shrinkage on reheating

5).Excellent spalling resistance (Thermal Shocks).

6).Save energy about 40%--50%.

7). ISO 9001:2000.

8).Up 15 years' experience of production and export.

3.Production procedure:

batch---mold---dry--sinter.

4.Properties

ITEM   HXAB-003	Properties
Al2O3  %	≥98%
SiO2   %	≤0.5%
Fe2O3   %	≤0.5%
Bulk Density	1.45~1.6g/cm3
Apparent Porosity	40%~60%
cold crushing strength	10~20 MPa
Thermal conductivity at 350 centidrade	0.8-0.9(w/m•K)
Refractoriness under load  at 0.2MPa, 0.6%	≥1650°C
Permanent Linear Change on reheating %	+0.3--0.3 1hours 1600°C

 5. Application:

1). As lining components for the high temperature industries furnace (above 1800, such as       refractory,  electronics, ceramics industries).

2).As Thermal insulation components for the high temperature heating equipments, such as gas making furnace, gasification furnace of petrochemical industry, reacting furnace of off-colour industry, electric induction furnace of metallurgical industry.

fire refractory brick