Potassium Aluminium Fluoride (PAF): Forms, Applications, and Supplier Selection Guide
White potassium aluminium fluoride lump, one example of PAF product forms.
Potassium aluminium fluoride (PAF) is an inorganic fluoride flux used mainly in the aluminum industry. It is also called potassium fluoroaluminate or potassium cryolite. PAF lowers the melting temperature of alumina, improves electrolytic conductivity, removes oxide films and supports smooth aluminum brazing. Buyers also use PAF as an active filler in grinding wheels and as a process flux in ceramics and glass.
This guide covers PAF basics, white versus grey grades, powder versus granular versus lump forms, common applications, and the key points for selecting a potassium aluminium fluoride supplier.
The Problem: PAF Terminology and Grades Are Often Confusing
When researching potassium aluminium fluoride, purchasers may see multiple names: PAF, potassium fluoroaluminate, potassium tetrafluoroaluminate, potassium cryolite, KAlF4 or K3AlF6. Market reports sometimes confuse it with potassium fluoride, even though the applications differ. Suppliers may quote white PAF, grey PAF, powder, granular, lump or flux without clearly showing which grade is appropriate for a given process.
This confusion creates practical risks. A grey industrial-grade product may work as a foundry flux or abrasive filler, but a brazing application may need a higher-purity white grade. A powder may be suitable for dry mixing in a resin-bonded wheel formula; a granular form may be easier to meter in a casting line. Choosing the wrong type can affect flux activity, brazing quality or wheel performance.
The first task, therefore, is not simply to find any PAF price, but to define the actual application and then match the correct PAF form and grade to that application.
Industry Background: PAF Is a Growing Specialized Flux Market
Potassium aluminium fluoride is distinct from common potassium fluoride. As a complex fluoride, its main commercial role is in aluminum processing, where it acts as a flux or inert filler. According to DataHorizzon Research, the global potassium aluminum fluoride market was valued at USD 1.76 billion in 2024 and is projected to reach USD 2.62 billion by 2033, expanding at a CAGR of 4.8% during 2025-2033.
The growth is supported by aluminum smelting and casting activity, corrosion-free brazing of aluminum assemblies, abrasive production, and non-ferrous metal recycling. For practical trade purposes, potassium aluminium fluoride is often shipped under HS Code 38101090, which covers pickling preparations for metal surfaces and fluxes. The CAS number for potassium aluminum fluoride is 60304-36-1, according to PubChem.
A useful benchmark for understanding fluoride cost pressure is aluminum fluoride (AlF3). In March 2026, Northeast Asia reported an AlF3 price of USD 1.80/kg, up 6.5% from Q4 2025. PAF prices generally vary with grade, purity, form, particle size and order volume.
Detailed Solution: Key Forms, Grades and Functional Roles of PAF
White and Grey PAF
Potassium aluminium fluoride is available in grey and white variants. In many supply chains, grey PAF is associated with industrial-grade flux used for foundry and abrasive applications. White PAF is typically linked to higher-purity, brazing-grade material, and is required in corrosion-free aluminum brazing and specialty glass applications. Industry sourcing guidance distinguishes industrial-grade material at about 98% minimum purity from high-purity grade at more than 99%.
Grey potassium aluminium fluoride powder.
Powder, Granular and Lump Forms
PAF can be produced in powder, granular and lump forms. Typical particle sizes from a dedicated manufacturer include mesh 200 powder, 0.3-1.0 mm granules and 0.5-1.5 mm granules. Lump material can also be supplied and further crushed or shaped by the producer or customer.
Granular grey PAF in the 0.3-1.0 mm size range.
Powder is a convenient dry raw material for blending into abrasive mixes and flux coatings. Granular products discharge more uniformly in dosing equipment and reduce dusting. Lump material offers flexibility for customers who need their own crushing or sizing step.
How PAF Works in Aluminum Smelting and Casting
In aluminum electrolysis and casting, PAF is added as a key functional flux. It lowers the melting temperature of alumina, improves electrolyte conductivity and supports deoxidation. It also acts as a degassing agent: it helps remove harmful gases from molten aluminum and improves alloy quality.
How PAF Improves Resin-Bonded Grinding Wheels
For the abrasive industry, PAF is more than a neutral filler. It is known as a performance-enhancing active filler. The main mechanisms are:
- Heat absorption at high grinding temperatures, which reduces workpiece burns.
- Stronger adhesion between abrasive grains and the bond system.
- Improved heat dissipation and reduced resin aging.
- Regulated self-sharpening: dull grains detach at the right time, exposing fresh cutting edges.
- Anti-clogging behavior that keeps the wheel surface clean.
Grinding-wheel manufacturers value this combination because it can help keep wheels sharp, extend service life and improve machining accuracy. Sumetech reports that correct use of PAF can extend the lifespan of resin-bonded grinding wheels by 20%-30%.
Supplier and Manufacturing Capability
For companies looking for potassium aluminium fluoride suppliers, a direct manufacturer can provide clearer quality control, stable supply and more product options. Sumetech Industry Co., Ltd, established in 2019, is a direct manufacturer of potassium aluminium fluoride and other specialty chemicals, positioning itself as China's largest manufacturer of PAF in granular and powder forms.
The company's annual production capacity is 5,000 metric tons, and its facility covers 6,000 square meters. Its production line includes ultrafine mechanical mills, crushing and shaping machines, and advanced sieving and classification systems. A dedicated R&D and quality control team of 5 full-time senior engineers supports process stability and product consistency.
Sumetech supplies the refractory, abrasive, welding and aluminum alloy industries worldwide. Export business accounts for 90% of sales, with major markets in Turkey, Japan, Korea and Europe. The company also offers customized production for particle size distribution, morphology, purity grades and packaging specifications.
Step-by-Step: How to Select a Potassium Aluminium Fluoride Supplier
- Define your application and required grade. Identify whether you need fluxing for aluminum smelting, corrosion-free brazing, abrasive manufacturing or ceramics. Brazing and specialty processes generally call for high-purity white PAF. Foundry and abrasive uses can often work with grey industrial grade.
- Choose the physical form and particle size. Select powder, granular or lump based on your mixing, feeding and process control needs. Request specific particle sizes such as mesh 200, 0.3-1.0 mm or 0.5-1.5 mm.
- Verify product consistency. Confirm that the supplier uses classified production and testing equipment such as sieving systems and particle size analyzers. Ask about impurity control and batch-to-batch stability.
- Check customization flexibility. If your process requires a custom particle size distribution, morphology, purity grade or packaging format, confirm that the manufacturer can supply it without disrupting delivery.
- Assess production capacity and logistics. Ask about annual capacity, raw material inventory and export experience. A supplier with direct production and stock planning is better positioned to handle urgent orders.
- Request a Safety Data Sheet and sample. Always review the SDS for handling guidance. Run a small trial with the exact PAF form and grade before committing to bulk volume.
White PAF powder at mesh 200.
Use Cases and Industry Applications
Electrolytic Aluminum Smelting
PAF is a core flux in modern electrolytic aluminum production. It lowers the melting point of alumina and improves electrolysis efficiency, making it a fundamental material for aluminum reduction.
Corrosion-Free Brazing of Aluminum Alloys
In aluminum brazing, especially for battery water-cooling plates and air conditioning radiators in new energy vehicles, potassium aluminium fluoride removes oxide films and improves weld quality without leaving corrosive residues.
Ceramics and Glass Manufacturing
PAF acts as a flux and opacifier in ceramics and glass. It can lower sintering temperatures, improve glaze texture, and enhance heat resistance and corrosion resistance.
Abrasive and Grinding Wheel Industry
As an active filler, PAF increases adhesion between abrasives and binders. It helps grinding wheels stay sharp, improves heat dissipation, and extends service life in demanding resin-bonded applications.
Non-Ferrous Metal Recycling and Casting
In recycled aluminum processing and aluminum alloy casting, PAF supports degassing and slag removal, helping improve metal cleanliness and casting quality.
Comparison Table: Grey PAF vs White PAF
| Attribute | Grey PAF | White PAF |
|---|---|---|
| Common grade guidance | Industrial grade, typically about 98% minimum purity | High-purity grade, typically above 99% |
| Typical applications | Foundry flux, deoxidizer, abrasives, aluminum alloy casting | Corrosion-free brazing, specialty glass, high-end flux applications |
| Available forms | Powder, granular, lump | Powder, granular, lump |
| Example particle sizes | mesh 200; 0.3-1.0 mm; 0.5-1.5 mm | mesh 200; 0.3-1.0 mm; 0.5-1.5 mm |
| Selection factor | Good for industrial flux and abrasive filler applications | Preferred where high purity is specified for brazing or clear ceramic/glass performance |
FAQ
What regulatory classifications should be checked for potassium aluminium fluoride?
Under the U.S. OSHA Hazard Communication Standard (29 CFR 1910), potassium aluminum fluoride is classified under GHS as Acute Toxicity Category 4 (oral, dermal and inhalation) and Skin Irritation Category 2. Buyers should request the supplier SDS, follow handling precautions and store product in a dry, well-ventilated area.
Can a supplier provide both white and grey PAF in powder, granular and lump form?
Yes, if the supplier has a flexible production line. Sumetech Industry Co., Ltd supplies PAF in grey and white forms and in powder (mesh 200), granular (0.3-1.0 mm or 0.5-1.5 mm) and lump forms. Product availability should always be confirmed for the exact specification.
Can potassium aluminium fluoride be customized to my process requirements?
Yes. Sumetech offers customizable production for particle size distribution, morphology, purity grades and packaging specifications. This is useful for abrasive makers, flux blenders and aluminum processors that need a PAF product fitted to their process.
How can I request a sample or quotation?
Requests for samples or quotations can be sent to Sumetech by email to info@sumetech.com, or by phone/WhatsApp at +86 13805218959. The technical team can share available particle sizes, purity details and packaging options.
Does Sumetech support large-volume supply and fast delivery?
Sumetech's annual production capacity is 5,000 metric tons. It maintains large raw material inventories to support uninterrupted production and fast turnaround for urgent orders. Export accounts for 90% of sales, with active use in Turkey, Japan, Korea and Europe.
Conclusion
PAF is not a single generic chemical; the correct choice depends on color grade, purity, particle size and form. A sourcing team should first map the application and then work with a direct manufacturer that can demonstrate production control and customization capability.
Finished potassium aluminium fluoride ready for industrial delivery.
Interested in comparing white and grey PAF specifications for your process? Contact Sumetech Industry Co., Ltd at info@sumetech.com or via WhatsApp to request samples and technical details.