PHF – Phosphorus Free Ceramic Foam Filter is specially designed for molten aluminum filtration applications where phosphorus contamination must be strictly controlled. Compared with conventional ceramic foam filters, PHF filters do not contain phosphorus-based additives, making them more suitable for high-quality aluminum alloy production and sensitive downstream processing applications.
The filter effectively removes oxide films, slag particles, refractory debris, and other non-metallic inclusions from molten aluminum while helping maintain stable melt flow during casting.
PHF ceramic foam filters are widely used in aluminum casting lines requiring cleaner metal, improved surface quality, and reduced risk of phosphorus-related contamination.
Why Use Phosphorus-Free Ceramic Foam Filters?
In certain aluminum alloy applications, phosphorus contamination may negatively affect:
- Electrical conductivity
- Surface treatment performance
- Foil and sheet quality
- Downstream processing stability
- High-purity alloy requirements
PHF filters help reduce these risks while maintaining reliable molten aluminum filtration performance.
Key Features
- Phosphorus-free formulation
- Effective removal of non-metallic inclusions
- Stable molten aluminum flow
- Reduced turbulence during filtration
- Improved casting surface quality
- Compatible with standard filter box systems
- Suitable for high-quality alloy applications
Expanding Fiber Edge for Better Sealing
The filter adopts an expanding fiber edge design to improve sealing reliability between the ceramic foam filter and the filter box.
During preheating, the fiber edge expands slightly to reduce small gaps around the filter seat, helping minimize molten aluminum bypass and improve filtration efficiency.
Benefits include:
- Better sealing performance
- More stable filtration
- Reduced side leakage
- Improved casting consistency
Available PPI Options
PHF ceramic foam filters are available in multiple pore densities:
- 10 PPI / 20 PPI – larger flow rate applications
- 30 PPI – standard filtration applications
- 40 PPI / 50 PPI / 60 PPI – finer filtration and higher cleanliness 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
Customized dimensions and special edge structures are available according to filter box requirements.
Why Buyers Choose PHF Ceramic Foam Filters
Phosphorus-Free Composition
Suitable for aluminum alloy production processes where phosphorus contamination control is important.
Stable Pore Structure
Uniform pore distribution helps maintain stable filtration performance during continuous casting operations.
High Production Consistency
Automated production lines help improve dimensional stability and batch consistency.
High Dimensional Accuracy
Dimensional tolerance is controlled within ±1–2 mm for reliable sealing and better filter box matching.
Good Thermal Shock Resistance
Designed for molten aluminum filtration conditions with proper preheating procedures.
Custom Technical Support
Technical recommendations can be provided based on alloy type, casting process, filtration target, and casting speed.
