The alumina bubble produced by the company is a hollow spherulitic heat-inaulating meterial,which is made by electrofused method.It is noted for its light-weight,heat-resistance,close pore.It is an ideal filler for high-temperatuer furnaces and and excellent aggregate of light weight castable refractory.And it is an ideal heat-inaulating and energy-saving refractory in high temperatrue.

Items Unit Index

Chemical composition Al2O3 % 98.5min

SiO2 % 0.25max

Fe2O3 % 0.10max

Na2O % 0.40max

Refractoriness °C 1800min

Principal crystalline -- a -Al2O3

Packing density g/cm3 0.50~1.00

Particle size mm φ0.2~5

Light Weight Alumina Bubble Castable Refractory

Properties Brands KT-è½» GL-18C

Chemical composition(%) Al2O3 ≥95 ≥95

SiO2 ≤0.5 ≤0.5

max service temperature ( ° C ) 1800 1800

bulk density after burnt at 1500 ° C(g/cm3) 1.35-1.40 1.35-1.40

Linear changes after burnt at (1500°C�3h)(%) ±0.5 ±0.5

compressive / bending

strength ( MPa ) 110 ° C�24h ≥8 /≥3 ≥8/≥3

1100 ° C�3h ≥15/≥4 ≥15/≥4

1500 ° C�3h ≥20/≥6 ≥25/ ≥6

max particle size of bubbles(mm) 5 5

water content for construction (%): 9-12 9-12

thernel conductivity coefficient(w/m.k) 0.7-0.8 0.7-0.8

The alumina bubble is a hollow spherulitic heat-insulation matrials,which is made by electro fusing method.It is noted for its light-weight,heat-resistance,close pore.It is an ideal filler for high-temperature furnaces and an excellent aggregate of light weight castable refractory.

Physical Chemical Performance Index

SPEC Al2O3:99.00% MIN

Fe2O3:0.15% MAX

Na2O:0.40% MAX

SiO3:0.25% MAX

Size 0.1-5.0mm(or in mesh size)

Packing density 0.45-1.0g/cm3

Main crystalline a-Al2O3

Working temp. 1800° C

Packing 200KGS or 25KGS BAGS+BIG BAGS