1100-O Commercially Pure Aluminum: 99.0% Minimum Al
ASTM B209 · Updated: 2026-05-25
1100 is commercially pure aluminum (99.0% minimum Al) in the soft annealed (O) temper. It offers the highest thermal conductivity (222 W/m·K), electrical conductivity (59% IACS at O temper for EC grade), and corrosion resistance of all aluminum alloys—at the cost of very low mechanical strength. Used for chemical processing equipment, food processing, heat exchanger fins, electrical bus conductors, nameplates, and spun hollowware where formability and corrosion resistance matter more than strength. Work-hardens slowly, enabling deep drawing and complex spinning operations without intermediate annealing.
Quick Facts
| Category | Aluminum Alloy |
| Standard | ASTM B209 |
| Density | 2.71 g/cm³ |
| Yield Strength | 34 MPa (5 ksi) annealed |
| Tensile Strength | 90 MPa (13 ksi) annealed |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN AW-1100 | Compare |
| Al99.0Cu | Compare |
| A1100 | Compare |
| AA1100-O | Compare |
| ISO Al99.0Cu | Compare |
Related Materials
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Frequently Asked Questions
What is the difference between 1100 and 1350 aluminum?
1350 (formerly EC grade) is specifically refined for electrical conductor applications with 99.50% minimum Al and controlled impurities to achieve minimum 61.0% IACS conductivity. 1100 is a general-purpose grade with 99.0% minimum Al and slightly lower conductivity (~59% IACS) but better formability and wider availability. For bus bars, use 6101-T6 (heat-treated for strength + conductivity).