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Ceramic Foam Filter

Ceramic Foam Filter

Al2O3 Ceramic Foam Filter Plate

Al2O3 Ceramic Foam Filter Plate is suitable for the filtration and purification of aluminum and alloy solutions with 1000 ℃.

In order to meet increasing quality requirements of aluminum castings, the use of alumina ceramic foam filters (plates) is becoming more and more important. Filters are also widely used in ordinary sand casting, such as wet mold casting, and fixed mold casting, such as automotive aluminum parts casting.

The use of filtration process is mainly based on the following considerations:

1. Filtration makes the flow of molten aluminum more orderly and relatively calm;

2. Solid slag in the molten metal is effectively removed, and the quality of castings is rapidly improved.


Al2O3 Ceramic Foam Filter Plate is a kind of foam material made from high purity alumina. The foam ceramics have the characteristics of uniform porosity, high temperature resistance, heat shock resistance, wear resistance and chemical stability.

Widely used in casting processing, water treatment, chemical industry, environmental protection and other industries. 

It is the ideal liquid aluminum filter; Catalyst support, and good sound insulation, thermal insulation material. Product shapes, sizes, and voids PPI can be designed and manufactured on request.

Al2O3 Ceramic Foam Filter Plate

Why choose Al2O3 Ceramic Foam Filter Plate to filter aluminium?

There are many reasons for aluminum pollution:

● In the smelting process, aluminum is exposed to the furnace atmosphere in a molten or semi-molten state, easy to oxidize, easy to react with water vapor and absorb hydrogen, easy to form various forms of non-metallic slag (such as furnace lining debris, chloride, carbide in flux, etc.) and coarse metal intercompound particles and so on. 

● Part of the waste that makes up the charge brings some non-aluminum impurities into circulation.

● Because the waste comes from the factory of each process waste and waste and waste outside the plant, so the way is different, the composition is complex, the quality is poor. These impurities often make the billet produce bubbles and inclusions, which seriously affect the purity of the metal melt, and further affect the machining properties, mechanical properties, corrosion resistance and the appearance quality of the product.

Al2O3 Ceramic Foam Filter Plate

What can Alumina Ceramic Foam Filter Plates do?

● Alumina foam ceramic filter plate can effectively remove all kinds of inclusions with fineness up to micron level in aluminum liquid, make aluminum liquid into a steady laminar flow, which is conducive to filling. 

● It has a unique mullite-corundum structure, good mechanical strength and chemical stability, excellent resistance to aluminum liquid erosion performance.

● It can obtain stable filtration effect by strict control of hole size and through hole rate.

● The ceramic foam filter plate is surrounded by a sealing ceramic fiber liner, which facilitates the seal of the filter plate in the filter box to ensure that there is no metal liquid sideflow.

The alumina foam ceramic filter product effectively removes the solid inclusions in the Peirong metal, so the aluminum alloy can be smoothly forged, aluminum foil manufacturing extrusion processing and other processes to obtain high-quality products.

A selection range of 10ppi coarse porosity to 40ppi very fine porosity, so there will always be a product standard that suits your requirements. Both ordinary sizes and special sizes required by customers can meet the requirements.

Regular Size

DimensionToleranceThicknessRake AngleTortuosityDiagonal Line
 12"/305mm  ±3mm  50mm±1mm  17.5°+1°  Max.4mm <1% of side length
 15"/381mm  ±3mm  50mm±1mm  17.5°+1°  Max.4mm <1% of side length
 17"/432mm  ±3mm  50mm±1mm  17.5°+1°  Max.4mm <1% of side length
 20"/508mm  ±4mm  50mm±1mm  17.5°+1°  Max.4mm <1% of side length
 23"/584mm  ±4mm  50mm±1mm  17.5°+1°  Max.4mm <1% of side length

*Remarks: There are no cracks and obvious defects on the surface, no slag, and sealing cotton around it, the thickness is 7mm-10mm.

Physical performance indicators

Edge CoveringAsbestos---Normal
Expanded Vermiculite---Superior
AL2O3 Content  ≥83% 
Porosity ≥85% 
Proportion 0.3g/cm³-0.45g/cm³ 
Refractory temperature ≥1500℃ 
Bending strength >0.5Mpa 
Thermal shock resistance 750℃/5times 
SolubilityUnder the temperature of metal aluminum and aluminum alloy solution, the filter equipment will not chemically react with the solution and dissolve.

Size and Shape Deviation

ItemAllowable variation

Side length allowable variation(mm)±3±4±5
Diagonal line allowable variation(mm)±5±7±9
Plane clearance allowable variation(mm)≤3≤6
Thickness allowable variation(mm)±2

Side rake allowable variation(°)±1°

Remarks:1. Diagonal deviation refers to the difference between the lengths of two diagonals on large surface of filter plate.2. The plane gap is to place the large surface of filter plate on platform, and measure the gap between filter plate and platform.3. Side bevel refers to the angle between side bevel and large surface.4. The filter plates involved in the table are all products with a theoretical thickness of 50mm and a side inclination angle 17.5°.

Quality Inspection

Three most important key points that make our quality always best are:

● The most advanced testing equipment and technology are adopted today in Hebei Cangchen to ensure the consistant filters quality. 

● There is a quality inspection team with rich experience and technology to keep best quality in our quality control department.

● Thanks to many years of product export and feedback information from domestic and foreign customers, we have accumulated considerable experience and expertise in quality control and improvement.

Al2O3 Ceramic Foam Filter Plate

Quality Assessment Factor

1. Transmittance---Light transmittance refers to the effective filtering area of the foam ceramic filter plate product. The higher the transmittance, the fewer blind holes, the more effective filter holes (display holes), and the better the filtering effect.

2. Porosity---Porosity refers to the percentage of the total volume of pores in the filter plate product to the total volume of the filter plate product. The porosity determines the filtration capacity of the foam ceramic filter plate per unit volume. The larger the porosity, the greater the filtration flow of the filter plate and the stronger the filtration capacity, and vice versa.

3. Pore uniformity---Pore uniformity is used to describe the difference between the actual number of pores per 25.4mm length in the filter plate product and the theoretically required number of pores. The smaller the gap, the better the product quality. If the gap is too large, the filter plate product will reduce the retention capacity of impurities or the filtration speed of the melt is too slow, which cannot meet the individual requirements of users in production. The size of the pore uniformity mainly depends on the foam used in the production of the filter plate. The pore uniformity of the foam is good, and the pore uniformity of the filter plate is good, so the selection of the foam is extremely important.

4. Compressive strength---The higher the compressive strength, the more durable the product, the better the quality, and vice versa.

5. Using Method---Please click here to check more information.

Quality Inspection Before Loading

As a professional manufacturer and exporter, Hebei Cangchen has accumulated considerable experience and expertise in quality control and improvement due to many years of product export and feedback information from domestic and foreign customers.

Al2O3 Ceramic Foam Filter Plate

Do you have any interesting in special-shapedalumina ceramic foam filters?


Filtration of molten aluminium

Water treatment

Chemical industry

Environmental protection and other industries

Catalyst support and good sound insulation thermal insulation material

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Contact Us

+86 158 3011 4065

+86 158 3011 4065

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