High-Purity Aluminum A7

Functional copper engineered for sub-ppm impurity thresholds in systems that cannot fai

Aluminum A7 (99.7%): The Industrial Standard for High-Purity Aluminum

In the global metals market, High-Purity Aluminum A7—containing a minimum of 99.7% aluminum—is recognized as the primary “workhorse” grade. Often referred to as P1020 in international markets, this grade represents the ideal balance between extreme purity and industrial affordability.

Whether cast into ingots for remelting or billets for extrusion, A7 aluminum is the fundamental building block for the modern power grid, automotive lightweighting, and high-performance alloys.

Technical Specifications: The A7 Standard

To be classified as A7, the metal must adhere to strict chemical limits.² The remaining $0.3\%$ is carefully controlled to ensure it does not interfere with the metal’s conductivity or corrosion resistance.

Element	Content (%)
Aluminum (Al)	$\ge 99.70\%$
Silicon (Si)	$\le 0.10\%$
Iron (Fe)	$\le 0.20\%$
Copper (Cu)	$\le 0.01\%$
Zinc (Zn)	$\le 0.03\%$
Gallium (Ga)	$\le 0.03\%$

Density: ³ $\approx 2.7 \text{ g/cm}^3$ (One-third the weight of steel).⁴
Melting Point: ⁵ $660.3^\circ\text{C}$ (⁶ $1220.5^\circ\text{F}$ ).⁷
Appearance: Silvery-white with a brilliant metallic luster.⁸
Conductivity: Approximately $62\%$ of the International Annealed Copper Standard (IACS), but with much lower weight.

Aluminum Purity & Grade Comparison

Grade	Purity Level	Max Impurities	Industry Names	Typical Form Factors	Best For…
A7	$\ge 99.70\%$	$< 3,000 \text{ ppm}$	P1020, Standard	Ingots, Billets, T-Bars	Construction & Electrical Grid
A8 / A85	$\ge 99.80\%$	$< 2,000 \text{ ppm}$	High Purity	Ingots, Coils, Foils	Chemical & Food Packaging
4N	$\ge 99.99\%$	$< 100 \text{ ppm}$	Ultra-High Purity	Pellets, Slugs, Cut Wire	Aerospace & High-End Alloys
5N	$\ge 99.999\%$	$< 10 \text{ ppm}$	Super Purity	Sputtering Targets, Crystals	Semiconductors & Quantum Tech