Aluminum 1090 · temper
Aluminum 1090-O
Properties of the O condition, compared with the other 1090 tempers.
Default stock condition: maximum ductility and conductivity for deep drawing, spinning, foil, capacitor and conductor applications.
What is 1090-O?
1090-O is 1090 in the O temper — default stock condition: maximum ductility and conductivity for deep drawing, spinning, foil, capacitor and conductor applications. 1090-O has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 65 MPa (9.43 ksi) — weaker than 99% of aluminum grades. Elongation at break is 42% and the elastic modulus is 69 GPa (10 Msi). 1090-O has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 60% of aluminum grades. It melts at 657°C (1,215 °F).
Advantages
- Forms and bends easily — 100/100, better than 100% of aluminum grades
- Ductile — tolerates forming and impact — 42%, better than 99% of aluminum grades
- Conducts heat well — 234 W/m·K (135.2 BTU/hr·ft·°F), better than 99% of aluminum grades
- High electrical conductivity — 62 % IACS, better than 99% of aluminum grades
- Polishes to a fine finish — 88/100, better than 97% of aluminum grades
Limitations
- Low strength — 22 MPa (3.19 ksi), worse than 99% of aluminum grades
- Difficult to machine — 22/100, worse than 97% of aluminum grades
1090-O properties
Typical room-temperature values for 1090-O — 13 properties are specific to this condition; the rest are grade-level values shared by every 1090 temper. Each bar shows where the value sits among the aluminum grades in FabDigit's library — further right is higher.
Physical3
1090-O has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 60% of aluminum grades. It melts at 657°C (1,215 °F).
Mechanical10
1090-O has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 65 MPa (9.43 ksi) — weaker than 99% of aluminum grades. Elongation at break is 42% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1090-O is rated for continuous service to 200°C (392 °F). It conducts heat at 234 W/m·K (135.2 BTU/hr·ft·°F), better than 99% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1090-O conducts electricity at 62 % IACS, better than 99% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 1090-O takes about 215 MJ of energy and emits 12.5 kg of CO₂ — more than 92% of aluminum grades. Typical recycled content is 5%.
Manufacturability8
1090-O's machinability is poor (22/100, worse than 97% of aluminum grades); weldability excellent (92/100); formability excellent (100/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 1090 tempers and conditions
1090 is also supplied in 10 other conditions. The full side-by-side table is on the 1090 overview.
- H19Highest cold-work level, typical of thin technical foil and drawn wire; essentially no formability left.125 MPa yield · 35 HB
- H18Fully cold-worked strip and household/technical foil where flatness and stiffness matter more than bending.110 MPa yield · 33 HB
- H16Choose for flat parts needing more springiness and dent resistance with only mild forming.95 MPa yield · 30 HB
- H14Best general-purpose sheet balance: usable stiffness with acceptable bending for enclosures, trim and conductor strip.80 MPa yield · 27 HB
- H12Light cold work for slightly stiffer sheet/strip that still bends and forms readily.65 MPa yield · 24 HB
- ODefault stock condition: maximum ductility and conductivity for deep drawing, spinning, foil, capacitor and conductor applications.22 MPa yield · 19 HB
Working with 1090-O
Is 1090 easy to machine?
Very gummy — use polished high-rake carbide, high speed, sharp tools and generous lubrication to avoid built-up edge and torn surfaces; not suited to fine threads or tight tolerances.
Can 1090 be welded?
Excellent with TIG/MIG using ER1100 or high-purity ER1188 filler; resistance and ultrasonic welding also fine, but the weld and HAZ are annealed so H-temper strength is lost.
Can 1090 be formed, bent or molded?
Outstanding cold formability in O/H2x tempers — deep drawing, spinning, embossing and rolling down to thin foil; expect strong springback-free but low-strength results and possible orange-peel from coarse grain.
What surface finishes work on 1090?
Ideal base for bright/clear anodising, chemical brightening and mirror polishing (reflectors, trim); films are thin and soft, so hard anodising or plating is preferred where wear matters.
1090 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Simax per EN 573-3 / AA registration | ≤ 0.07 | 0.03 |
| Fe | ≤ 0.07 | 0.04 |
| Cu | ≤ 0.02 | 0.01 |
| Mn | ≤ 0.01 | 0 |
| Mg | ≤ 0.01 | 0 |
| Zn | ≤ 0.03 | 0.01 |
| Ti | ≤ 0.02 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| Ga | ≤ 0.03 | 0.01 |
| Others (each)others total 0.03 max | ≤ 0.01 | — |
| AlAl99.90 — verify exact impurity limits against the governing edition of EN 573-3 / GB/T 3190 | ≥ 99.9 (balance) | — |
1090-O — frequently asked
What is 1090-O used for?
1090-O is typically used for capacitor foil, vacuum-chamber components, reflector sheet, conductor and busbar stock, bright-anodized trim and thin-gauge rolled foil. In short: near-pure aluminum; ultra-clean.
What is the yield strength of 1090-O?
1090-O has a typical yield strength of 22 MPa (3.19 ksi) and a tensile strength of 65 MPa (9.43 ksi) — weaker than 99% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 1090-O easy to machine?
Not especially — machinability is rated poor (22/100, worse than 97% of aluminum grades). Very gummy — use polished high-rake carbide, high speed, sharp tools and generous lubrication to avoid built-up edge and torn surfaces; not suited to fine threads or tight tolerances.
Can 1090-O be welded?
Yes — weldability is rated excellent (92/100). Excellent with TIG/MIG using ER1100 or high-purity ER1188 filler; resistance and ultrasonic welding also fine, but the weld and HAZ are annealed so H-temper strength is lost.
What surface finishes work on 1090-O?
Ideal base for bright/clear anodising, chemical brightening and mirror polishing (reflectors, trim); films are thin and soft, so hard anodising or plating is preferred where wear matters.
Can 1090-O be formed, bent or molded?
Outstanding cold formability in O/H2x tempers — deep drawing, spinning, embossing and rolling down to thin foil; expect strong springback-free but low-strength results and possible orange-peel from coarse grain.
What is the maximum service temperature of 1090-O?
1090-O is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 1090-O?
Yes — 1090-O is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 573-3 — Aluminium and aluminium alloys, chemical composition of wrought products — CEN (2019)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- EN 485-2 — Aluminium sheet, strip and plate: mechanical properties — CEN (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.