Ceramic Foam Filter

Category: Filtration Products

Ceramic Foam Filter

Ceramic Foam Filter is used for molten aluminum filtration to remove oxide inclusions and improve metal cleanliness. It features stable pore structure, good thermal shock resistance, and smooth aluminum flow for more reliable casting quality.

It features a three-dimensional porous ceramic structure with high open porosity, allowing molten aluminum to pass through while capturing impurities on the internal pore walls. Through a combination of mechanical sieving, adsorption, and flow turbulence effect.

CFF significantly improves melt cleanliness and reduces casting defects such as pinholes, cracks, and inclusions. It offers stable filtration performance, excellent thermal shock resistance, and is suitable for various aluminum casting applications including billet, slab, and foundry alloys.

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Ceramic Foam Filter is a proven filtration solution for molten aluminum treatment. Designed for aluminum casting lines, billet production, ingot casting, and foundry applications, it effectively removes oxide films, slag particles, refractory debris, and other non-metallic inclusions from molten aluminum before solidification.

Its three-dimensional porous structure helps stabilize molten metal flow while improving filtration efficiency and casting consistency. Cleaner aluminum melt contributes to better surface finish, lower scrap rates, fewer internal defects, and improved downstream machining performance.

Standard and customized sizes are available according to alloy type, casting speed, flow rate, and filter box design requirements.

Key Features

Effective removal of oxide inclusions and dross
Stable molten aluminum flow during filtration
Improved casting surface quality and internal cleanliness
Reduced turbulence during pouring
Compatible with standard filter box systems
Suitable for integration with online degassing equipment

Expanding Fiber Edge for Better Sealing

The ceramic foam filter adopts an expanding fiber edge design to improve sealing reliability between the filter and the filter box. During preheating, the fiber edge expands slightly and helps close small gaps around the filter seat.

This helps achieve:

Better sealing performance
Reduced molten aluminum bypass
More stable filtration efficiency
Improved casting consistency

Available PPI Options

We provide ceramic foam filters in multiple pore densities for different casting requirements:

10 PPI / 20 PPI – higher flow rate and larger inclusions
30 PPI – standard aluminum casting applications
40 PPI / 50 PPI / 60 PPI – finer filtration and higher surface quality requirements

Standard Sizes

Common sizes include:

7″ × 7″
9″ × 9″
12″ × 12″
15″ × 15″
17″ × 17″
20″ × 20″
23″ × 23″
26″ × 26″

Standard thickness: 50 mm

Custom dimensions and special edge structures are available upon request.

Our ceramic foam filters are widely used in molten aluminum filtration applications requiring improved metal cleanliness and stable casting performance.

Typical Casting Applications

Aluminum billet casting
Aluminum ingot casting
Rolling slab casting
Gravity casting
Low-pressure casting
Foundry aluminum casting
Recycled aluminum melt treatment
High-quality wrought alloy production

PAL – National Standard Series

Widely used in the production of:

Automotive aluminum alloys
3C materials
Industrial profiles
Civil profiles
Office furniture materials
Medium-thick plates
Composite materials
Photovoltaic aluminum products
PS plate materials

PAL – European Standard Series

Mainly used for high-end aluminum alloy applications such as:

Aviation materials
Military industry materials
Rail transit materials
Battery foil
Double-zero foil
Electronic aluminum products
Automobile wheels
Automotive sheet applications
Can body and can lid materials

For production lines requiring complete molten aluminum treatment, ceramic foam filters are commonly used together with online degassing systems, launders, and refractory filtration equipment.

Selecting the correct ceramic foam filter depends on several process conditions, including alloy type, casting speed, filtration precision, and molten aluminum flow rate.

1. Choose According to Alloy Type

Different aluminum alloys require different filtration precision and thermal stability performance. High-quality wrought alloys and precision castings usually require finer filtration grades.

2. Consider the Molten Aluminum Flow Rate

Higher casting flow rates generally require:

Lower PPI
Larger filtration area

This helps maintain stable melt flow and reduce blockage risk.

3. Define the Required Casting Quality

If your production focuses on:

Better surface finish
Lower inclusion content
Reduced leakage and pinholes

A finer PPI is usually recommended.

4. Match the Filter Box Size

The filter size must match the filter chamber dimensions and sealing structure to ensure stable filtration performance and prevent metal bypass.

Simple PPI Selection Guide

General aluminum casting: 20–30 PPI
Billet and ingot casting: 20–30 PPI
High-quality castings: 30–50 PPI
Fine filtration applications: 50–60 PPI

If you are unsure which PPI is suitable, our technical team can recommend an appropriate specification according to your alloy grade, pouring temperature, casting speed, and filtration requirements.

Installation Recommendations

For best filtration performance:

Preheat the filter properly before use
Ensure reliable edge sealing
Avoid direct high-speed molten metal impact
Maintain stable pouring conditions
Replace filters according to melt cleanliness and production volume

Proper installation directly affects filtration efficiency, filter life, and final casting quality.

Ceramic foam filters are commonly used together with supporting molten aluminum treatment equipment to achieve better metal cleanliness and more stable casting performance.

CFF Filter Box System

The filter box provides stable filter positioning, sealing support, and controlled molten aluminum flow during filtration.

Online Degassing Unit

Degassing equipment helps remove hydrogen and reduce gas porosity before filtration, improving overall melt quality.

Launder System

Refractory launders help transport molten aluminum smoothly while reducing temperature loss and secondary oxidation.

Electric Heating Filter Box

Heating filter box systems help maintain stable aluminum temperature during filtration and improve filtration consistency.

Refractory Materials

Supporting refractory components such as ceramic fiber insulation materials and hot-top casting parts help improve thermal efficiency and production stability throughout the casting process.

For complete molten aluminum treatment solutions, integrated system recommendations can be provided according to your casting line configuration and production requirements.