Aluminum 1145
AA 1145 · UNS A91145 · EN AW-1145, AW 1145 · JIS A1145
1145 is a high-purity commercial aluminium (min 99.45 % Al) with combined Si+Fe held to 0.55 % max, rolled almost exclusively into foil and thin strip.
1145 tempers and conditions
1145 is supplied in 8 conditions, soft to hard.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum ductility, deep drawing, flexible packaging laminates and formed heat-exchanger parts. | 25 | 75 | 35 | 21 HB | 61 % IACS |
Strain hardened and partially annealed, quarter hard | Stabilised soft-intermediate temper giving better bend ductility than H12 at similar strength. | 70 | 95 | 14 | 28 HB | 60 % IACS |
Strain hardened, quarter hard | Light cold work when a little stiffness is needed but forming must stay easy. | 75 | 90 | 12 | 28 HB | 60 % IACS |
Strain hardened and partially annealed, half hard | Half-hard but ductile strip for parts that must be formed after rolling (fin, container, lidding stock). | 85 | 115 | 10 | 33 HB | 60 % IACS |
Strain hardened, half hard | General-purpose semi-hard strip/sheet for mild bending with moderate strength. | 95 | 110 | 9 | 32 HB | 60 % IACS |
Strain hardened, three-quarter hard | Choose for flat strip and shallow-formed parts needing higher stiffness than H14. | 115 | 130 | 6 | 38 HB | 60 % IACS |
Strain hardened, full hard | Full-hard foil/strip for fin stock, shielding tape and laminate substrates where flatness and strength matter. | 140 | 150 | 5 | 44 HB | 60 % IACS |
Strain hardened, extra hard | The standard mill temper for 1145 foil — insulation/fin/cable and shielding foil where maximum as-rolled strength and flatness are wanted. | 150 | 165 | 4 | 42 HB | 60 % IACS |
What is 1145?
1145 is a high-purity commercial aluminium (min 99.45 % Al) with combined Si+Fe held to 0.55 % max, rolled almost exclusively into foil and thin strip. It is selected for its very high thermal and electrical conductivity, excellent formability and deep-draw/foil rollability, plus good corrosion resistance and a bright, clean surface for lamination and fin stock. Its limits are very low strength (it cannot be heat-treated, only strain-hardened), poor machinability and rapid softening above about 150 °C. 1145 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 646°C (1,195 °F). 1145 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 65% of aluminum grades. Elongation at break is 4% and the elastic modulus is 69 GPa (10 Msi).
What is 1145 used for?
- Insulation foil facing
- Packaging foil
- Heat exchanger fin stock
- Foil-plastic laminates for flexible packaging
- Cable and duct wrap foil
- Reflective vapour barriers
- Deep-drawn foil containers
Advantages
- Conducts heat well — 230 W/m·K (132.9 BTU/hr·ft·°F), better than 96% of aluminum grades
- High electrical conductivity — 60 % IACS, better than 95% of aluminum grades
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
- Readily welded — 90/100, better than 90% of aluminum grades
- Good corrosion resistance — 72/100, better than 83% of aluminum grades
Limitations
- Difficult to machine — 30/100, worse than 92% of aluminum grades
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
1145 properties
Typical room-temperature values; bars are the position among aluminum grades.
Physical3
1145 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 646°C (1,195 °F).
Mechanical10
1145 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 65% of aluminum grades. Elongation at break is 4% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1145 is rated for continuous service to 100°C (212 °F). It conducts heat at 230 W/m·K (132.9 BTU/hr·ft·°F), better than 96% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1145 conducts electricity at 60 % IACS, better than 95% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 83% of aluminum grades.
Sustainability4
Producing a kilogram of 1145 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 15%.
Manufacturability8
1145's machinability is poor (30/100, worse than 92% of aluminum grades); weldability excellent (90/100); formability fair (40/100).
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. 1145 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1145
Is 1145 easy to machine?
Very gummy and low-strength — use polished high-rake carbide, high speed, sharp tools and flood lubrication; expect burrs and built-up edge, and prefer H18/H19 over O for any chip cutting.
Can 1145 be welded?
Readily GTAW/GMAW/resistance welded with 1100 or 1188 filler, but foil gauges are normally joined by seaming, adhesive lamination or ultrasonic welding; welding fully anneals the H temper locally.
Can 1145 be formed, bent or molded?
Outstanding cold formability in O temper (deep draw, foil embossing); H18/H19 needs generous bend radii or interstage annealing at 340–400 °C.
Manufacturability
The process limits FabDigit applies to 1145. Every 1145 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Excellent40 / 100 |
|---|---|
| Weldability | Excellent90 / 100 |
| Bendable | Yes |
1145 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 silicon plus iron limit per AA registration | ≤ 0.55 | 0.35 |
| Cu | ≤ 0.05 | 0.01 |
| Mn | ≤ 0.05 | 0.01 |
| Mg | ≤ 0.05 | 0.01 |
| Zn | ≤ 0.05 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| Ti | ≤ 0.03 | 0.01 |
| Others (each)others total 0.10 max | ≤ 0.03 | |
| Alminimum 99.45 % aluminium | ≥ 99.45 (balance) |
What surface finishes work on 1145?
Takes bright and clear anodising very well thanks to high purity; also accepts chromate/no-chrome conversion coats, adhesive lamination and printing — degrease rolling oil before coating.
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).
Equivalent designations
Standards and trade names that resolve to Aluminum 1145 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A91145
- Aluminum Association
- AA1145
- EN / DIN / Werkstoff-Nr.
- AW-1145AW 1145Al99.45
- JIS
- A1145
How much does 1145 cost?
1145 is a budget-cost aluminum ($), cheaper than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1145 — frequently asked
What is 1145 used for?
1145 is typically used for insulation foil facing, packaging foil, heat exchanger fin stock, foil-plastic laminates for flexible packaging, cable and duct wrap foil and reflective vapour barriers. In short: foil grade; excellent ductility.
What is the yield strength of 1145?
1145 has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 65% of aluminum grades. Strength varies by condition: see the 8 listed tempers.
Is 1145 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 92% of aluminum grades). Very gummy and low-strength — use polished high-rake carbide, high speed, sharp tools and flood lubrication; expect burrs and built-up edge, and prefer H18/H19 over O for any chip cutting.
Can 1145 be welded?
Yes — weldability is rated excellent (90/100). Readily GTAW/GMAW/resistance welded with 1100 or 1188 filler, but foil gauges are normally joined by seaming, adhesive lamination or ultrasonic welding; welding fully anneals the H temper locally.
What surface finishes work on 1145?
Takes bright and clear anodising very well thanks to high purity; also accepts chromate/no-chrome conversion coats, adhesive lamination and printing — degrease rolling oil before coating.
Can 1145 be formed, bent or molded?
Outstanding cold formability in O temper (deep draw, foil embossing); H18/H19 needs generous bend radii or interstage annealing at 340–400 °C.
What is the maximum service temperature of 1145?
1145 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1145 cost?
1145 is a budget-cost aluminum ($), 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 1145?
Yes — 1145 is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASTM B209 / B479 — Aluminum sheet, plate and foil — ASTM International (2021)
- EN 573-3 / EN 546 — Aluminium and aluminium alloys: chemical composition and foil — CEN (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Aluminium foil alloy 1145 product data (fin / insulation / shielding foil) — Foil producer datasheets (2023)
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.