99.9% Aluminum is a high-purity commercially pure aluminum with a nominal composition of 99.9% Al balance. Its very low impurity content delivers excellent corrosion resistance, strong electrical insulating properties in oxide form, and consistent physical behavior across applications requiring tight chemistry control. It is widely used in galvanizing and surface treatment processes as one of the most effective methods for protecting base metals from corrosion.
Applications for this grade include critical components requiring extreme dimensional tolerances, high-temperature service in severe environments, and electrical insulation applications where the naturally forming alumina layer provides reliable dielectric performance. Its purity makes it suitable as a base material for precision alloying operations where impurity contributions from the aluminum carrier must be minimized.
Supplied as 2–5 mesh shot for rapid melt addition and precise charge weight control, and as 50 lb ingots for larger production melts requiring efficient furnace loading.
Available Forms
2-5 Mesh Shot, 50 Lb. Ingots
Product Code
1008
Technical Info
Thermal Properties
Melting Point (Solidus)1,190°F (643°C)
Melting Point (Liquidus)1,215°F (657°C)
Physical Properties
Density (imperial)0.098 lbs/in³
Density (metric)2.71 g/cm³
Primary ElementsAl
Lead FreeYes
Key Features
High PurityExcellent Corrosion ResistanceElectrical InsulationGalvanizing Grade
Nominal Composition
99.9% Al
Bal
Frequently Asked Questions
Common technical inquiries regarding 99.9% Aluminum
The difference between 99.9% and 99.99% aluminum is a tenfold reduction in total impurity content. For most casting, galvanizing, and general alloying applications, 99.9% provides sufficient purity at lower cost. The 99.99% grade is justified when trace impurities would measurably affect the final product — such as in optical reflector applications where surface quality is critical, laboratory reference melts where background impurities must be excluded, or semiconductor-related processes with stringent contamination requirements.
99.9% aluminum is used in hot-dip galvanizing bath formulations and as a component in Galvalume and Zincalume coatings, where aluminum is alloyed with zinc to improve the corrosion performance of the coating beyond what pure zinc alone provides. Aluminum's primary contribution is the formation of a stable, adherent Al-Zn intermetallic layer at the steel substrate interface that provides excellent barrier protection, and its high-purity form ensures consistent coating chemistry and minimizes contamination of the galvanizing bath.
The 2–5 mesh shot form dissolves rapidly due to its high surface-area-to-mass ratio, making it ideal for precision additions to smaller melts or for automated dosing systems where exact charge weights are required. The 50 lb ingot is suited to large furnace operations where efficient bulk loading and storage are priorities — it melts more slowly but is easier to handle, stack, and inventory. Shot should be stored dry to prevent surface oxidation that can introduce oxide inclusions when added to a sensitive melt.
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