Aluminum 1100
AA 1100 · UNS A91100 · ASTM AWS A5.10 ER1100 · EN Al99.0Cu, AW-1100 · JIS A1100, A1100WY
1100 is commercially pure aluminium (99.0 % Al min) with a small controlled copper addition, strengthened only by cold work.
1100 tempers and conditions
1100 is supplied in 12 conditions, soft to hard.
Compare all 12 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum ductility — deep drawing, spinning, severe bending and highest conductivity. | 34 | 90 | 40 | 23 HB | 59 % IACS |
Strain hardened from hot working only | Standard temper for thick 1100 plate and extruded shapes where cold rolling is not applicable. | 45 | 95 | 25 | 25 HB | 59 % IACS |
Strain hardened, hot-rolled plate temper | Commercially pure 1100 aluminium supplied as hot-rolled plate with a small amount of incidental strain hardening, giving strength just above the annealed condition while retaining excellent formability, weldability and conductivity. | 90 | 110 | 14 | 28 HB | 58.5 % IACS |
Strain hardened and partially annealed, quarter hard | Same strength class as H12 but with better ductility and flatness stability from the partial anneal. | 90 | 110 | 20 | 27 HB | 58 % IACS |
Strain hardened and partially annealed, half hard | H14-level strength with extra forming reserve — common for deep-drawn and spun 1100 parts. | 100 | 125 | 15 | 31 HB | 57 % IACS |
Strain hardened, quarter hard | Light cold work — a compromise when O is too floppy but forming is still moderately severe. | 105 | 110 | 17 | 28 HB | 57 % IACS |
Strain hardened, half hard | The default stock temper for 1100 sheet and coil — usable strength with still-excellent bending and welding. | 115 | 125 | 12 | 32 HB | 57 % IACS |
Strain hardened and partially annealed, three-quarter hard | H16 strength level with improved bend behaviour for roll-formed profiles. | 125 | 145 | 11 | 37 HB | 57 % IACS |
Strain hardened, three-quarter hard | Choose when a stiffer, more dent-resistant panel is needed and only gentle bends are required. | 140 | 145 | 9 | 38 HB | 57 % IACS |
Strain hardened and partially annealed, full hard | Full-hard strength with stabilised, flat coil for high-speed stamping. | 145 | 165 | 7 | 43 HB | 57 % IACS |
Strain hardened, full hard | Maximum cold-worked strength for flat parts, foil stock and stampings needing springiness rather than bendability. | 150 | 165 | 6 | 44 HB | 57 % IACS |
Strain hardened, extra hard | Very heavily rolled foil and fin stock where the highest as-rolled strength is needed. | 170 | 185 | 3 | 48 HB | 57 % IACS |
What is 1100?
1100 is commercially pure aluminium (99.0 % Al min) with a small controlled copper addition, strengthened only by cold work. It is chosen for outstanding formability, weldability, corrosion resistance and very high thermal/electrical conductivity in items such as heat-exchanger fins, chemical vessels, lighting reflectors, nameplates, spun holloware and deep-drawn parts. Its limits are low strength (it cannot be heat treated), poor machinability due to gumminess, and rapid softening of H tempers above about 150 °C. 1100 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °F). 1100 has a yield strength of 115 MPa (16.7 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 79% of aluminum grades. Elongation at break is 12% and the elastic modulus is 69 GPa (10 Msi).
What is 1100 used for?
- Heat-exchanger fins
- Deep-drawn and spun parts
- Chemical vessels and tank liners
- Lighting reflectors
- Nameplates and signage
- ER1100 welding and brazing filler
- Foil and thin-gauge sheet components
Advantages
- Readily welded — 95/100, better than 99% of aluminum grades
- Conducts heat well — 222 W/m·K (128.3 BTU/hr·ft·°F), better than 94% of aluminum grades
- High electrical conductivity — 57 % IACS, better than 94% of aluminum grades
- Good corrosion resistance — 78/100, better than 94% of aluminum grades
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
Limitations
- Difficult to machine — 38/100, worse than 84% of aluminum grades
- Low strength — 115 MPa (16.7 ksi), worse than 79% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
1100 properties
Typical room-temperature values; bars are the position among aluminum grades.
Physical3
1100 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °F).
Mechanical11
1100 has a yield strength of 115 MPa (16.7 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 79% of aluminum grades. Elongation at break is 12% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1100 is rated for continuous service to 120°C (248 °F). It conducts heat at 222 W/m·K (128.3 BTU/hr·ft·°F), better than 94% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1100 conducts electricity at 57 % IACS, better than 94% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 1100 takes about 210 MJ of energy and emits 12.5 kg of CO₂ — more than 88% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
1100's machinability is fair (38/100, worse than 84% of aluminum grades); weldability excellent (95/100); formability excellent (85/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 1100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1100
Is 1100 easy to machine?
Very gummy — use sharp polished high-rake carbide, high surface speed, generous flood or mist lubrication and large chip clearance to avoid built-up edge; harder H16/H18 tempers finish noticeably better.
Can 1100 be welded?
Excellent by GTAW/GMAW/resistance and brazing; use ER1100 (or ER4043 where cracking is a concern) and accept that the HAZ reverts to O-temper strength.
Can 1100 be formed, bent or molded?
Outstanding cold formability — deep draws, spinning and tight bends (≈0–1 t bend radius in O/H12); anneal at 340–400 °C between severe forming steps.
Manufacturability
The process limits FabDigit's quote engine applies to 1100. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Fair38 / 100 |
|---|---|
| ISO material group | N.1 |
| Cutting speed (rough / finish) | 420 / 500 m/min |
| Minimum wall | 0.5 mm |
| Minimum internal radius | 0.8 mm |
| Drill depth limit | 8× diameter |
| Best surface (machined / polished) | Ra 0.8 / 0.4 µm |
| Hardenable after machining | No |
Sheet metal
| Formability | Excellent85 / 100 |
|---|---|
| Weldability | Excellent95 / 100 |
| Bendable | Yes |
| Minimum bend radius | 0.5× thickness |
| Spring-back | Low |
| Welding processes | MIG, TIG, SPOT, LASER |
1100 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 |
|---|---|---|
| Si+Fecombined Si plus Fe limit per AA/ASTM B209 | ≤ 0.95 | |
| Cuintentional addition for strength | 0.05 – 0.2 | 0.12 |
| Mn | ≤ 0.05 | |
| Zn | ≤ 0.1 | |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al99.00 % minimum aluminium | ≥ 99 (balance) |
What surface finishes work on 1100?
Anodizes bright and clear, takes dyes evenly, buffs to a high specular reflector finish, and accepts chromate/chemical conversion, paint and electroplating well.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Conversion Coating
PVD Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 1100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A91100
- ASTM
- AWS A5.10 ER1100
- Aluminum Association
- AA1100
- EN / DIN / Werkstoff-Nr.
- Al99.0CuAW-11003.0205S Al 1100
- GB (China)
- SAl1100
- JIS
- A1100A1100WY
How much does 1100 cost?
1100 is a budget-cost aluminum ($), cheaper than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1100 — frequently asked
What is 1100 used for?
1100 is typically used for heat-exchanger fins, deep-drawn and spun parts, chemical vessels and tank liners, lighting reflectors, nameplates and signage and ER1100 welding and brazing filler. In short: ultra-soft; maximum conductivity.
What is the yield strength of 1100?
1100 has a typical yield strength of 115 MPa (16.7 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 79% of aluminum grades. Strength varies by condition: see the 12 listed tempers.
Is 1100 easy to machine?
Not especially — machinability is rated fair (38/100, worse than 84% of aluminum grades). Very gummy — use sharp polished high-rake carbide, high surface speed, generous flood or mist lubrication and large chip clearance to avoid built-up edge; harder H16/H18 tempers finish noticeably better.
Can 1100 be welded?
Yes — weldability is rated excellent (95/100). Excellent by GTAW/GMAW/resistance and brazing; use ER1100 (or ER4043 where cracking is a concern) and accept that the HAZ reverts to O-temper strength.
What surface finishes work on 1100?
Anodizes bright and clear, takes dyes evenly, buffs to a high specular reflector finish, and accepts chromate/chemical conversion, paint and electroplating well.
Can 1100 be formed, bent or molded?
Outstanding cold formability — deep draws, spinning and tight bends (≈0–1 t bend radius in O/H12); anneal at 340–400 °C between severe forming steps.
What is the maximum service temperature of 1100?
1100 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1100 cost?
1100 is a budget-cost aluminum ($), cheaper than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in 1100?
Yes — 1100 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
- ASTM B209 / B209M — Aluminum and Aluminum-Alloy Sheet and Plate — ASTM International (2021)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- JIS H 4000 — Aluminium and aluminium alloy sheets, strips and plates — JSA (2014)
- MMPDS-style typical mechanical property tables for 1000-series wrought products — Battelle / FAA (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.