Overview
Aluminum 325 Mesh is a finely ground aluminum powder with particles small enough to pass through a 325-mesh sieve (approximately 44 microns). It is produced through atomization or milling processes, ensuring high purity and consistent particle size. This powder is a staple in industrial applications due to its excellent thermal and electrical conductivity, as well as its reactivity in chemical reactions. In B2B markets, it is commonly supplied in sealed containers to prevent oxidation and moisture absorption. Buyers prioritize suppliers with strict quality control to ensure uniformity, as variations can affect performance in end-use applications like explosives or alloy production.
Physical and Chemical Properties
The powder exhibits a silver-gray color and a spherical or flake morphology, depending on the production method. Its high surface area-to-volume ratio enhances reactivity, making it ideal for exothermic reactions. The material is insoluble in water and organic solvents but reacts with acids and alkalis to release hydrogen gas. Key metrics for industrial users include particle size distribution (typically 90% below 44 microns), bulk density (0.4–0.6 g/cm³ for flake types), and moisture content (below 0.1%). These properties are critical for applications like rocket propellants, where consistency directly impacts combustion efficiency.
Main Applications
Pyrotechnics account for 40–50% of demand, as the powder’s fine particles ensure bright flashes and controlled burn rates. In pigments, it provides metallic luster for automotive and decorative coatings. Metallurgical uses include alloying and exothermic welding, where its reactivity reduces oxide formation. The chemical industry employs it as a reducing agent or catalyst carrier. Emerging applications include 3D printing powders and conductive inks. Buyers should specify application requirements (e.g., flake vs. spherical) to suppliers, as morphology affects performance in coatings or composites.
Safety and Storage
As a combustible dust, Aluminum 325 Mesh requires hazard-compliant storage (NFPA 652 standards). Electrostatic discharge must be controlled via grounded equipment, and areas should have explosion-proof ventilation. Moisture-resistant packaging (e.g., nitrogen-purged drums) prevents oxidation and hydrogen buildup. Personal protective equipment (PPE) like respirators and anti-static suits is mandatory during handling. Spills should be cleaned with non-sparking tools. Long-term storage should avoid temperature fluctuations to minimize degradation. Regulatory compliance (OSHA, REACH) is essential for international shipments.
B2B Procurement Guide
Industrial buyers should request certificates of analysis (CoA) for purity, particle size, and moisture. Bulk orders (500+ kg) often reduce costs by 10–20%. Reliable suppliers provide batch testing data and SDS documentation. Spot prices fluctuate with aluminum ingot markets; contracts with price-adjustment clauses mitigate risks. Logistics must prioritize airtight transport to prevent contamination. For niche applications like aerospace, custom particle size distributions (e.g., -400 mesh) may be available at premium rates.
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