Can you produce according to the samples?
Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Alumina bubble 3-5mm
Alumina bubble 3-5mm is usually made of high-purity industrial alumina, melted in an electric arc furnace at 2200℃, injected by an air compressor, and then made into alumina bubble products of different specifications according to the particle size of bubble alumina. Alumina bubble products have low apparent porosity, low thermal conductivity, good thermal shock resistance, and high-temperature structural strength. They can be directly built in the lining of the high-temperature kiln in contact with flame, as well as the manufacture of high-temperature furnace tubes, trays, protective covers, etc.
Introduction of alumina bubble 3-5mm：
Industry alumina powder raw materials of alumina bubble 3-5mm are melted in an electric arc furnace at 2200℃. When pouring the melt out, blow the melt with high-pressure air to make the melt dispersed into small droplets. During the cooling process, the droplets form alumina hollow balls due to surface tension effects. The hollow balls are screened to remove fine powder and big fragments and particles. Iron is removed with the magnetic iron. Broken balls are removed with a ball selecting machine. Then the alumina bubble is packed as the finished products.
Properties of alumina bubble 3-5mm:
- High Melting Point
- Chemical Inertness
- High Hardness
- Abrasion / Wear-Resistance
- Superior Insulating Properties
- Resistance to Thermal Shock
- Dielectric Properties
Application of alumina bubble 3-5mm:
- High Porosity Abrasives
- Filtration with Aggressive or Molten
- Firing Beds/Bedding material
- Thermal Insulation Coating
- Lightweight Refractories product,
- Refractory lightweight bricks
- Lightweight Castable
- Lightweight Unshape Refractories
Chemical compositions of alumina bubble 3-5mm:
| Chemical compositions | Index |
| Al2O3 (%) ≥ | 99 |
| SiO2 (%) ≤ | 0.2 |
| Na2O (%) ≤ | 0.25 |
| Fe2O3 (%) ≤ | 0.15 |
| Maximum Working Temperature (℃) | 1850 |
| Granularity (mm) | 3.0-5.0 |
Bubble Alumina（FAQ）
What is grit size?
Grit size typically runs from coarse (16 -24 grit), medium (36 – 60 grit) and fine (80-120 grit). Superfine grits run from 150 and higher. Grinding wheels usually will be between 24 and 100 grit. Honing stones and jointing stones and other polishing abrasives will be 150 grit and higher.
What is porosity?
Porosity is defined as the gas proportion (cavity volume) of a particle’s total volume. It can be determined using different measurement techniques, such as gas adsorption and mercury porosimetry. With the same grain size and shape, a lower bulk density corresponds to a higher porosity of the grains.
What is the hardness?
Hardness is rated from A-Z with ‘A’ being the weakest bond and ‘Z’ being the strongest. A weak bond is preferred for grinding harder materials while a stronger bond is desired for softer materials. A typical weak bond for steel would be in the ‘F, G or H’ range. A
Where’s your main market?
Our main market include Europe,America,Oceania,Asia.,etc.
What is the grit type?
Grit type is either aluminum oxide (white, pink, ruby red, brown, grey, etc.) silicon carbide (black or green), ceramic (blue and pink) or any combination of these. Grit types are sometimes mixed in combination for achieving certain cutting characteristics. Aluminum oxide is friable (white) or semi-friable (pink, brown and grey, red,
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Bubble Alumina Products
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