Alumina Bubble

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.

Alumina_Bubble

Physical Chemical Performance Index
Light Weight Alumina Bubble
Chemical Properties

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

alumina_bubble1 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.


Properties	Brands	KT-轻	GL-18C
Chemical composition(%)	Al₂O₃	≥95	≥95
Chemical composition(%)	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

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

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