Forming
O temper draws and spins easily; anneal between operations for deep parts.
Aerospace · high-purity light-gauge sheet
1145 Aerospace Aluminium Sheet
1145 is 99.45 % pure aluminium, specified in aerospace mainly as annealed foil and light-gauge sheet to SAE AMS 4011. The thin sheet is used for reflective heat shields, shims, gaskets, screening and formed covers that need high purity, conductivity and formability. Metline supplies 1145 sheet in O, H14 and H24, and advises on 1050A or 1100 where thicker plate is needed.
- Alloy
- 1145 (UNS A91145)
- Purity
- 99.45 % Al min
- Tempers
- O, H14, H24, H19
- Spec
- SAE AMS 4011 (1145-O)
What 1145 sheet is and where it is used
1145 is best known as a foil alloy. Its aerospace specification, AMS 4011, covers foil and light-gauge sheet in the annealed condition, so most 1145 sheet bought for aircraft work is thin: typically from a few tenths of a millimetre to a little over a millimetre.
In that range, 1145-O is used for parts where high purity pays off: reflective radiation and heat shields, laminated shims, sealing gaskets, conductive screening and EMC shields, liners and small spun or drawn covers. It forms very easily, anodises and bright-dips to a highly reflective finish, and conducts heat and electricity better than 1100.
For heavier sheet and plate there is little practical reason to pay for 1145 purity. 1050A or 1100 plate gives almost identical forming and corrosion behaviour, is far more widely produced, and is listed in the common sheet and plate specifications. We will quote 1145 at heavier gauges if your drawing requires it, but we will also tell you when an equivalent grade would save time and cost.
1145 chemical composition
| Element | Limit (wt %) |
|---|---|
| Silicon + iron (Si + Fe) | 0.55 max combined |
| Copper (Cu) | 0.05 max |
| Manganese (Mn) | 0.05 max |
| Magnesium (Mg) | 0.05 max |
| Zinc (Zn) | 0.05 max |
| Vanadium (V) | 0.05 max |
| Titanium (Ti) | 0.03 max |
| Others, each | 0.03 max |
| Aluminium (Al) | 99.45 min |
"1145A" appears on some data sheets but is not a separately registered grade. Certificates should state 1145 with the limits shown.
Mechanical and physical properties
| Temper | Tensile strength (guide) | Elongation | Use |
|---|---|---|---|
| O (AMS 4011) | about 60 – 100 MPa | High; increases with gauge | Spinning, drawing, shims, gaskets |
| H14 / H24 | about 100 – 140 MPa | Moderate (H24 more than H14) | Flat covers and shields |
| H19 | about 150 MPa and above | Low | Very thin flat stock |
Exact tensile and elongation limits are set by thickness band in the governing specification and reported on the certificate.
Physical properties (typical)
- Density
- 2.70 g/cm³
- Electrical conductivity
- about 61 – 62 % IACS (O)
- Thermal conductivity
- about 230 W/m·K
- Melting range
- about 646 – 657 °C
Specifications and equivalents
| Document / system | Designation or scope |
|---|---|
| SAE AMS 4011 | Foil and light-gauge sheet, 99.45 Al, 1145-O (stabilised 2022) |
| ASTM B479 | 1145 annealed foil, commercial |
| UNS | A91145 |
| ISO | Al99.45 |
| Nearest sheet and plate grades | 1050A (EN 485, 99.5 %), 1100 (AMS 4001 / ASTM B209) |
Gauges, sizes and finishing
Supply range
- Thickness
- Light-gauge sheet, typically about 0.2 – 1.5 mm; foil below that
- Width
- Up to about 1250 mm; slit strip to order
- Form
- Coil, slit strip or cut sheets
- Surface
- Mill, bright or degreased; PVC film on request
- Processing
- Slitting, cut-to-length, blanks and circles
Joining
Welds and brazes readily; often bonded or riveted in laminated shim packs.
Finishing
Bright dipping and anodising give high reflectivity for heat shields.
How to order 1145 sheet
- SpecifyAlloy and temper, thickness, width and length or coil, quantity and the governing specification with its revision (AMS 4011 or a customer specification).
- ConfirmWe confirm the specification can be met, the tolerance class, test requirements and delivery terms (EXW, FOB, CIF or DAP).
- InspectMaterial is checked for dimensions and surface condition; any extra tests named on the order are carried out or arranged.
- DocumentEach lot ships with a mill test certificate to EN 10204 3.1 showing chemistry and mechanical results, traceable to the heat or lot number.
- Pack and shipExport packing in sealed, moisture-protected cases or on pallets, shipped by sea or air to your port or door.
References and standards
- SAE AMS 4011 – Aluminum, Foil and Light Gage Sheet, 99.45Al (1145-O), Annealed
- ASTM B479 – Annealed Aluminum and Aluminum-Alloy Foil
- The Aluminum Association – International Alloy Designations and Chemical Composition Limits (Teal Sheets)
- ASM Handbook, Vol. 2 – Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
1145 aerospace aluminium (aluminum) sheet: FAQ
Is 1145 available as thick plate?
It can be produced, but it is rarely worth it. 1145 is specified mainly as foil and light-gauge sheet. For plate, 1050A or 1100 gives nearly the same properties and is easier to source.
What is the difference between 1145 and 1100 sheet?
1145 is 99.45 % Al with very low impurities and no copper addition; 1100 is 99.00 % Al with 0.05 – 0.20 % copper. 1145 is slightly softer and more conductive.
Which specification covers 1145-O sheet for aerospace?
SAE AMS 4011, which covers foil and light-gauge sheet in the annealed condition.
Is 1145A a real grade?
It is not a separately registered alloy. Order and certify as 1145.
Why use 1145 for heat shields?
Its high purity gives a bright, highly reflective surface after bright dipping or anodising, and it forms easily into shield shapes.
Need thin 1145 sheet for shields or shims?
Send the gauge, size, temper and specification. We will confirm availability, or suggest an equivalent if it saves you time.
