alumina hollow ball for thermal insulation filler

Description for alumina hollow ball:

Alumina hollow ball is a new type of high temperature insulation material which is made from industrial aluminum treated by smelting in an electric furnace. The crystal form is a-Al2O3 micro crystals. Alumina hollow ball can be made into various shapes with the highest temperature 1800 ℃, which is of high mechanical strength, and the volume density is only one-half of corundum products.

Available sizes:

Mixed grade: 0.2-5mm

Graded grade: 0.06-0.1mm, 0.1-0.2mm, 0.2-0.5mm, 0.2-1mm, 0.5-1mm, 0.2-1mm, 1-2mm, 2-3mm, 1-3mm, 3-4mm, 3-5mm

Chemical index
size	Al2O3	Fe2O3		SiO2	Na2O	MgO		K2O	Cao
0.2-5mm	≥99%	≤0.15%		≤0.3%	≤0.5%	≤0.1%		≤0.1%	≤0.1%
Physical index
Bulk density			refractoriness				Shape
0.5-1g/cm3			1800 degree centigrade				White hollow ball