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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.

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 m2/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) 99 to 99.95
Silicon (Si) 0 to 1.0
Iron (Fe) 0 to 1.0
Copper (Cu) 0.050 to 0.2
Zinc (Zn) 0 to 0.1
Manganese (Mn) 0 to 0.050
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B491: Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications

ASTM B247: Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

ASTM B483: Standard Specification for Aluminum and Aluminum-Alloy Drawn Tube and Pipe for General Purpose Applications

ASTM B210: Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes

ASTM B211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire

ASTM B547: Standard Specification for Aluminum and Aluminum-Alloy Formed and Arc-Welded Round Tube

ASTM B221: Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

Aluminum Standards and Data, Aluminum Association Inc., 2013