The aluminum code number 1100 identifies what type of aluminum?

The aluminum code number 1100 identifies what type of aluminum?

• A. 11 percent copper content
• B. aluminum alloy containing zinc
• C. aluminum alloy containing magnesium
• D. 99 percent commercially pure aluminum

Answer: (D)

Aluminum numbering shows how pure the metal is and what elements are added. The 1xxx series is essentially pure aluminum with no significant alloying elements. Within that series, the grade 1100 is designated for commercially pure aluminum with about 99% aluminum content. That makes it very ductile, easy to form, and highly resistant to corrosion, which is why it’s used for applications like chemical handling and thin-walled parts. So the correct interpretation is that 1100 identifies nearly pure aluminum, not an alloy with copper, zinc, or magnesium. The other options describe alloys from other series (which are defined by the presence of those elements), not the 1xxx commercially pure category.

Aluminum numbering shows how pure the metal is and what elements are added. The 1xxx series is essentially pure aluminum with no significant alloying elements. Within that series, the grade 1100 is designated for commercially pure aluminum with about 99% aluminum content. That makes it very ductile, easy to form, and highly resistant to corrosion, which is why it’s used for applications like chemical handling and thin-walled parts.

So the correct interpretation is that 1100 identifies nearly pure aluminum, not an alloy with copper, zinc, or magnesium. The other options describe alloys from other series (which are defined by the presence of those elements), not the 1xxx commercially pure category.