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1200 (Al99.0, 3.0205, 1C, A91200) Aluminum

1200 aluminum is a 1000-series aluminum alloy: it is considered commercially pure, and is formulated for primary forming into wrought products. 1200 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-1200. 1C is the British Standard (BS) designation. A91200 is the UNS number. Additionally, the EN chemical designation is Al99,0. And the AFNOR (French) designation is A-4. Older literature may refer to this material as 1C, but this is now discouraged.

It originally received its standard designation in 1966. 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 1200 aluminum include twelve 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 1200 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

Brinell Hardness

23 to 48

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 106 psi

Elongation at Break

1.1 to 28 %

Fatigue Strength

25 to 69 MPa 3.7 to 10 x 103 psi

Poisson's Ratio


Shear Modulus

26 GPa 3.7 x 106 psi

Shear Strength

54 to 100 MPa 7.8 to 15 x 103 psi

Tensile Strength: Ultimate (UTS)

85 to 180 MPa 12 to 26 x 103 psi

Tensile Strength: Yield (Proof)

28 to 160 MPa 4.1 to 23 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

660 °C 1210 °F

Melting Onset (Solidus)

650 °C 1210 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

230 W/m-K 130 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

58 % IACS

Electrical Conductivity: Equal Weight (Specific)

190 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.0 % relative


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)

2.0 to 19 MJ/m3

Resilience: Unit (Modulus of Resilience)

5.7 to 180 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

8.7 to 19 points

Strength to Weight: Bending

16 to 26 points

Thermal Diffusivity

92 mm2/s

Thermal Shock Resistance

3.8 to 8.1 points

Alloy Composition

Among wrought aluminum alloys, the composition of 1200 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 100
Silicon (Si) 0 to 1.0
Iron (Fe) 0 to 1.0
Zinc (Zn) 0 to 0.1
Manganese (Mn) 0 to 0.050
Titanium (Ti) 0 to 0.050
Copper (Cu) 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

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993

EN 754-2: Aluminium and aluminium alloys. Cold drawn rod/bar and tube. Mechanical properties

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

EN 755-2: Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles. Mechanical properties

EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties

Aluminum Standards and Data, Aluminum Association Inc., 2013

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993

ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products