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Buyers must prioritize particle size distribution (D50) and active aluminum content, which should typically be above 90% for industrial applications. For coatings and pigments, the water coverage area (cm²/g) is a critical metric for determining leafing properties. Additionally, verify the aspect ratio (diameter to thickness), as high-aspect-ratio flakes provide better metallic luster and barrier properties.
Since aluminium powder is classified as a flammable solid, it must comply with UN Class 4.1 or 4.3 regulations. Ensure the supplier provides a valid Material Safety Data Sheet (MSDS) and GHS-compliant labeling. For specific industries, look for ISO 1247 (Aluminium pigments for paints) or REACH registration if exporting to the European Union to ensure chemical safety and environmental compliance.
The choice depends on whether you need Leafing or Non-Leafing types. Leafing flakes float to the surface of the coating film, providing a chrome-like finish and high UV resistance, ideal for roof coatings. Non-Leafing flakes distribute evenly throughout the film, offering better adhesion and abrasion resistance, making them suitable for automotive paints and industrial machinery.
Request a Certificate of Analysis (COA) for every batch. Key tests should include sieve analysis to check for oversized particles, non-volatile matter content, and moisture content (which must be kept extremely low to prevent hydrogen gas evolution). For high-end applications, ask for Scanning Electron Microscopy (SEM) images to verify the morphology and smoothness of the flakes.
The greatest risk is combustion or explosion due to moisture exposure or friction. It is categorized as Dangerous Goods (DG). You must ensure the supplier uses UN-approved packaging (usually steel drums with plastic liners) and selects carriers experienced in handling Class 4 hazardous materials. Always verify the IMDG Code requirements for sea freight to avoid port rejection.
Utilize Secured Trading Services provided by reputable platforms like Made-in-China.com to protect your payment until delivery is confirmed. Conduct a factory audit or hire a third-party inspector (like SGS or Intertek) to perform a Pre-Shipment Inspection (PSI) to verify that the product matches the technical specifications agreed upon in the contract.
Prices are heavily influenced by the London Metal Exchange (LME) aluminium spot price. Negotiate a formula-based pricing model (LME price + processing fee) to ensure fairness during market volatility. For bulk orders exceeding 5 tons, aim for a 10-15% discount on the processing premium, and request free samples (500g-1kg) to test compatibility with your resin systems before finalizing the contract.
Check the HS Code (typically 7603.20) for specific import duties in your country. Because it is a 'dual-use' item in some jurisdictions (due to potential use in explosives), you may need an Import License. Ensure all documents, including the Commercial Invoice, Packing List, and Dangerous Goods Declaration, have perfectly matching descriptions to prevent customs seizures or heavy fines.
