Aluminum 1275
AA 1275 · EN AW-1275, Al99.75
1275 (EN AW-1275, Al99.75) is a commercially pure aluminum of the 1000-series family at 99.75% Al minimum, used in European chemical, decorative and electrical work where corrosion resistance and conductivity govern.
Reference datasheet — 1275 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the H14 condition
1275 tempers and conditions
1275 is supplied in 13 conditions, soft to hard. H14 is the default FabDigit quotes; the values on this page are for it.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for deep drawing, spinning, chemical-vessel lining and foil where maximum ductility matters. | 25 | 70 | 42 | 19 HB | 62 % IACS |
Slightly strain hardened | Sheet/plate essentially in O condition but with incidental work from levelling or stretching. | 30 | 75 | 35 | 21 HB | 61.8 % IACS |
Strain hardened from hot working only | Hot-rolled plate, extrusions and forged shapes where only modest guaranteed strength is required. | 32 | 78 | 28 | 22 HB | 61.5 % IACS |
As fabricated | Extruded or cast-and-rolled stock supplied without guaranteed mechanicals; used where properties are set by later processing. | 35 | 80 | 25 | 23 HB | 61.5 % IACS |
Strain hardened and partially annealed, quarter hard | Same strength class as H12 but with better ductility and more stable properties for forming. | 68 | 88 | 16 | 25 HB | 61.8 % IACS |
Strain hardened, quarter hard | Light cold work for slightly higher strength while retaining good bending and forming. | 72 | 85 | 14 | 25 HB | 61.8 % IACS |
Strain hardened and partially annealed, half hard | Preferred over H14 when the part must still be bent or drawn after supply. | 85 | 103 | 11 | 30 HB | 61.5 % IACS |
H14Default Strain hardened, half hard | The general-purpose stocked sheet temper: usable strength and flatness with acceptable bending. | 90 | 100 | 8 | 30 HB | 61.5 % IACS |
Strain hardened and partially annealed, three-quarter hard | H16-level strength with improved bend behaviour, for roll-formed profiles and trim. | 100 | 118 | 7 | 34 HB | 61.3 % IACS |
Strain hardened, three-quarter hard | Choose for flat panels and shallow forming where higher stiffness under handling is wanted. | 105 | 115 | 5 | 34 HB | 61.3 % IACS |
Strain hardened and partially annealed, full hard | Full-hard strip stabilized by a partial anneal; used for foil and thin strip needing consistent hardness. | 118 | 132 | 5 | 38 HB | 61 % IACS |
Strain hardened, full hard | Maximum practical strength from cold work; for flat strip, foil stock and rigid trim with minimal forming. | 120 | 130 | 4 | 38 HB | 61 % IACS |
Strain hardened, extra hard | Extra-hard strip/wire condition beyond H18, used for springy strip, foil and conductor wire. | 140 | 150 | 3 | 42 HB | 60.8 % IACS |
What is 1275?
1275 (EN AW-1275, Al99.75) is a commercially pure aluminum of the 1000-series family at 99.75% Al minimum, used in European chemical, decorative and electrical work where corrosion resistance and conductivity govern. It is selected for its 61.5% IACS electrical conductivity, 230 W/m-K thermal conductivity and clean anodizing response, and is stocked as sheet, strip and conductor forms in O, F, H111, H112 and H12 through H28. The listed condition is work-hardened at 90 MPa yield, 100 MPa tensile, 8% elongation and 30 HB, so ductility is limited and the O tempers should be used for severe forming; machinability is low at 32 and service temperature is limited to 120 C. 1050A or 1070A are the nearest alternatives. 1275 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). 1275 has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 100 MPa (14.5 ksi) — weaker than 87% of aluminum grades. Elongation at break is 8% and the elastic modulus is 69 GPa (10 Msi).
What is 1275 used for?
- chemical process vessels
- decorative trim
- electrical conductor stock
- reflector sheet
Advantages
- High electrical conductivity — 61.5 % IACS, better than 97% of aluminum grades
- Conducts heat well — 230 W/m·K (132.9 BTU/hr·ft·°F), better than 96% of aluminum grades
- Polishes to a fine finish — 85/100, better than 96% of aluminum grades
- Readily welded — 92/100, better than 95% of aluminum grades
- Forms and bends easily — 78/100, better than 87% of aluminum grades
Limitations
- Difficult to machine — 32/100, worse than 89% of aluminum grades
- Low strength — 90 MPa (13.1 ksi), worse than 87% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
1275 properties
Typical room-temperature values for 1275-H14; bars are the position among aluminum grades.
Physical3
1275 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).
Mechanical11
1275 has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 100 MPa (14.5 ksi) — weaker than 87% of aluminum grades. Elongation at break is 8% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1275 is rated for continuous service to 120°C (248 °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
1275 conducts electricity at 61.5 % IACS, better than 97% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), better than 67% of aluminum grades.
Sustainability4
Producing a kilogram of 1275 takes about 210 MJ of energy and emits 13 kg of CO₂ — more than 88% of aluminum grades. Typical recycled content is 3%.
Manufacturability7
1275's machinability is poor (32/100, worse than 89% of aluminum grades); weldability excellent (92/100); formability very good (78/100).
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. 1275 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1275
Is 1275 easy to machine?
Very soft and gummy — use polished high-rake carbide, high speed, generous feed and flood coolant or lubricated air to avoid built-up edge and smeared surfaces.
Can 1275 be welded?
Excellent GTAW/GMAW and resistance weldability; use 1100 or 1188 filler for matching purity and expect the weld/HAZ to return to O-temper strength.
Can 1275 be formed, bent or molded?
Outstanding cold formability in O/H22 — deep drawing, spinning and roll forming are easy; interanneal at 340–410 °C when heavy work-hardening builds up.
1275 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 |
|---|---|---|
| Siimpurity limit | ≤ 0.08 | 0.04 |
| Feimpurity limit | ≤ 0.12 | 0.07 |
| Cu | ≤ 0.05 | 0.01 |
| Mn | ≤ 0.02 | 0.01 |
| Mg | ≤ 0.02 | 0.01 |
| Zn | ≤ 0.05 | 0.01 |
| Ti | ≤ 0.03 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| Ga | ≤ 0.03 | 0.01 |
| Others (each)each other element | ≤ 0.02 | |
| Al99.75 % min by difference | ≥ 99.75 (balance) |
What surface finishes work on 1275?
Ideal for bright dipping and clear or coloured anodizing with very low haze; chemical conversion coating, painting and electropolishing all work well, but pure Al is soft so surfaces mark easily.
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).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 1275 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- AW-1275Al99.75
How much does 1275 cost?
1275 is a premium-cost aluminum ($$$), cheaper than about 51% 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.
1275 — frequently asked
What is 1275 used for?
1275 is typically used for chemical process vessels, decorative trim, electrical conductor stock and reflector sheet. In short: european 99.75% purity grade; high conductivity, 61.5% IACS; low ductility as supplied.
What is the yield strength of 1275?
1275 has a typical yield strength of 90 MPa (13.1 ksi) and a tensile strength of 100 MPa (14.5 ksi) — weaker than 87% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 1275 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 89% of aluminum grades). Very soft and gummy — use polished high-rake carbide, high speed, generous feed and flood coolant or lubricated air to avoid built-up edge and smeared surfaces.
Can 1275 be welded?
Yes — weldability is rated excellent (92/100). Excellent GTAW/GMAW and resistance weldability; use 1100 or 1188 filler for matching purity and expect the weld/HAZ to return to O-temper strength.
What surface finishes work on 1275?
Ideal for bright dipping and clear or coloured anodizing with very low haze; chemical conversion coating, painting and electropolishing all work well, but pure Al is soft so surfaces mark easily.
Can 1275 be formed, bent or molded?
Outstanding cold formability in O/H22 — deep drawing, spinning and roll forming are easy; interanneal at 340–410 °C when heavy work-hardening builds up.
What is the maximum service temperature of 1275?
1275 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.
What is the difference between 1275-H14 and 1275-O?
H14 is the default condition — the general-purpose stocked sheet temper: usable strength and flatness with acceptable bending. O: pick for deep drawing, spinning, chemical-vessel lining and foil where maximum ductility matters. Yield strength is 90 MPa in H14 versus 25 MPa in O.
How much does 1275 cost?
1275 is a premium-cost aluminum ($$$), cheaper than about 51% 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.
Sources
- EN 573-3 Aluminium and aluminium alloys — Chemical composition of wrought products — CEN (2019)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate: Mechanical properties — CEN (2016)
- 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)
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.