1050 aluminum

Identity: retain the complete designation

1050 is a commercially pure wrought aluminum designation. The Aluminum Association's Teal Sheets, revised December 2025, register 1050 and 1050A separately. Both have a minimum aluminum content of 99.50% by mass, but that shared purity does not make their complete composition limits identical. Aluminum Association, Teal Sheets, December 2025, natural impurity limits

For example, the registered maximum zinc contents are 0.05% for 1050 and 0.07% for 1050A; maximum titanium is 0.03% and 0.05%, respectively. Both list silicon at 0.25% maximum and iron at 0.40% maximum. These are composition limits, not measured values for a particular batch. Teal Sheets, December 2025, 1050/1050A entries

Hydro labels its European extrusion datasheet EN AW-1050A [Al99.5]. Preserve that full identifier when it is the purchased material. A supplier's cross-reference to 1050 or an older national designation is a discovery aid, not authorization to substitute material on a drawing. Aalco itself warns that its listed corresponding designations may not be direct equivalents. Hydro EN AW-1050A datasheet; Aalco 1050A H14 sheet

An adequate purchase description includes alloy, designation system, temper, product form, thickness or section dimensions, applicable product standard/edition, dimensional tolerances and required inspection documentation. “1050 aluminum” alone does not establish strength, surface condition or an accepted equivalence.

Temper and product form control the property claim

This 1xxx material is not precipitation heat-treatable; work hardening changes its strength. Hydro describes F as as-fabricated, O as annealed, and H112 as strain hardened through extrusion to meet minimum requirements. Its datasheet concerns extrusions, not sheet. Hydro 1050A, printed 10/2018

Aalco describes H14 sheet as work hardened by rolling to half hard, without subsequent annealing. Its indicative datasheet reports 105–145 MPa tensile strength and 85 MPa minimum proof stress for a listed 0.2–6.00 mm sheet range, referencing BS EN 485-2:2008. The same page explicitly says requirements vary with temper, product and dimensions, and that its data cannot replace the full specification. Do not turn this summary into a current universal acceptance table. Aalco 1050A H14 sheet, mechanical properties and disclaimer

By contrast, Hydro's extrusion table lists H112 minimum 0.2% proof stress 20 MPa and tensile strength 60 MPa, citing EN 755-2:2016. The F-temper entries are expressly informational, and its Brinell hardness is informational rather than a guaranteed minimum. Hydro 1050A extrusion datasheet, mechanical properties and footnotes

These examples illustrate why a database should not contain one unqualified “1050 yield strength.” Keep the source, temper, form, dimensional range, property definition and status—minimum, range, typical or informational—with each number. For elongation, retain the test gauge length and specimen conditions too. Check the actual standard's thickness band before using an inspection certificate to accept a particular sheet or profile.

Typical physical values are not design allowables

Hydro reports typical room-temperature values at 20°C of density 2.70 g/cm³, elastic modulus 69 GPa and thermal conductivity 229 W/(m·K). Its table also gives a melting range of 645–658°C. These descriptive values are useful for preliminary comparisons; a melting range is not a permissible continuous-service temperature. Hydro 1050A, physical properties and source footnote, 10/2018

Calculated mass example: using 2,700 kg/m³, a nominal 1,000 × 500 × 2 mm rectangular sheet has volume 0.001 m³ and estimated mass 2.70 kg. This excludes thickness/size tolerances, coatings, protective film and cutouts. It is an estimating calculation, not a weighbridge result or a guaranteed shipping mass.

For a conductor or heat-transfer component, specify the electrical or thermal requirement directly. A purity designation alone does not define contact resistance, joint performance, permissible current, operating temperature or a complete cooling design.

Forming, machining and joining

Aalco rates cold workability excellent but machinability poor for its 1050A H14 sheet offering. That combination supports screening the material for formed sheet applications rather than assuming it behaves like a free-machining alloy. It does not establish a universal bend radius, draw ratio, cutting speed or lubricant. Aalco 1050A H14 fabrication guidance

Qualify forming on the actual thickness, temper, rolling direction, tooling and surface requirement. Record the minimum acceptable bend geometry and inspect for cracking, thinning and cosmetic damage. Changing from O to H14, or changing a supplier's product route, is a process change requiring review even when the chemistry designation remains unchanged.

Good weldability does not imply retention of work-hardened parent strength. Hydro explains that fusion welding can soften cold-worked non-heat-treatable aluminum in the heat-affected zone. Distinguish base-metal properties, weld-metal properties and the local heat-affected condition when evaluating a joint. Hydro, aluminum welding rods and heat-affected zones

Select filler and procedure for both joined alloys, service environment and required final properties. A general filler recommendation is not a qualified welding procedure. Cleaning, oxide control, distortion and leak-tightness requirements belong in the manufacturing plan; do not prescribe a universal filler, brazing cycle or post-weld strength from the 1050 label.

Corrosion and service boundaries

Hydro describes the alloy as corrosion resistant and lists chemical/food-handling applications. Those application examples do not certify compatibility with every chemical, cleaning agent or food-contact requirement. Hydro 1050 aluminum applications

General aluminum corrosion guidance identifies strongly acid/alkaline environments and contact with more noble metals as concerns. Evaluate actual chemical concentration, temperature, moisture, crevices, dissimilar-metal contacts and surface treatment. Do not apply an atmospheric corrosion description to an immersed process vessel without application-specific evidence. Hydro, aluminum design guidance, section 3.9

Acceptance and traceability

Speira's Karmøy 1050A H14 declaration, issued 23 November 2022, links composition to EN 573-3 and mechanical properties to EN 485-2. It states that cast and production-order numbers appear on inspection certificates and coil/sheet labels. Its entries for weldability, bendability, fatigue and general corrosion performance are npd (no performance determined), not blanket performance approvals. Speira declaration collection, PDF pp. 5–6

Keep receiving identity and batch evidence linked to the material through cutting and fabrication. When the drawing requires 1050, do not silently accept 1050A; when it requires a specified temper, do not accept chemistry alone. Resolve equivalence, property minima and service suitability before release rather than filling missing data with typical handbook values.

Related reference

Grades, tempers and conditions