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1100 (Al99.0Cu, A91100) Aluminum

1100 aluminum is a 1000-series aluminum alloy: it is considered commercially pure, and is formulated for primary forming into wrought products. 1100 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-1100. A91100 is the UNS number. Additionally, the EN chemical designation is Al99,0Cu.

It has been in use since 1888, but has only received its standard designation in 1954. This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

The properties of 1100 aluminum include eleven common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 1100 aluminum to: 1000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

1100-H112 Aluminum 1100-H113 Aluminum

1100-H12 Aluminum 1100-H14 Aluminum

1100-H16 Aluminum 1100-H18 Aluminum

1100-H22 Aluminum 1100-H24 Aluminum

1100-H26 Aluminum 1100-H28 Aluminum

1100-O Aluminum

Mechanical Properties

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 10⁶ psi

Elongation at Break

1.1 to 32 %

Fatigue Strength

32 to 71 MPa 4.6 to 10 x 10³ psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 10⁶ psi

Shear Strength

54 to 95 MPa 7.8 to 14 x 10³ psi

Tensile Strength: Ultimate (UTS)

86 to 170 MPa 12 to 24 x 10³ psi

Tensile Strength: Yield (Proof)

28 to 150 MPa 4.1 to 22 x 10³ psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

660 °C 1210 °F

Melting Onset (Solidus)

640 °C 1190 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

220 W/m-K 130 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

59 % IACS

Electrical Conductivity: Equal Weight (Specific)

190 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.0 % relative

Calomel Potential

-740 mV

Density

2.7 g/cm³ 170 lb/ft³

Embodied Carbon

8.2 kg CO₂/kg material

Embodied Energy

150 MJ/kg 66 x 10³ BTU/lb

Embodied Water

1190 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

0.76 to 52 MJ/m³

Resilience: Unit (Modulus of Resilience)

5.7 to 170 kJ/m³

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

8.7 to 17 points

Strength to Weight: Bending

16 to 25 points

Thermal Diffusivity

90 mm²/s

Thermal Shock Resistance

3.7 to 7.4 points

Alloy Composition

Among wrought aluminum alloys, the composition of 1100 aluminum is notable for containing comparatively high amounts of silicon (Si) and iron (Fe). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy. Most of the time, iron is an impurity in aluminum alloys. However, it may be added in quantity to improve strength (particularly at high temperatures) without much impact on electrical properties.

Aluminum (Al)Al		99 to 99.95
Silicon (Si)Si		0 to 1.0
Iron (Fe)Fe		0 to 1.0
Copper (Cu)Cu		0.050 to 0.2
Zinc (Zn)Zn		0 to 0.1
Manganese (Mn)Mn		0 to 0.050
Residualsres.		0 to 0.15