1100 Aluminum Guide: Properties, Applications & Specifications

1100 aluminum alloy is a commercially pure aluminum with a minimum aluminum content of 99.0%. It belongs to the 1xxx series of aluminum alloys, which are known for their exceptional purity, corrosion resistance, and workability. As one of the most widely used pure aluminum grades, 1100 aluminum offers an excellent balance of formability, corrosion resistance, and electrical conductivity, making it a preferred choice for applications ranging from aluminum foil to chemical equipment and electrical conductors.

At HXM Aluminum, we specialize in manufacturing and supplying high-quality 1100 aluminum products including aluminum sheets, aluminum coils, foil, and strip. With decades of experience serving global B2B clients, we provide 1100 aluminum products that meet international standards including ASTM B209, EN AW-1100, and JIS A1100. This comprehensive guide covers everything you need to know about 1100 aluminum alloy — from chemical composition and mechanical properties to applications and sourcing from China.

The 1xxx series alloys are characterized by their high aluminum content, with 1100 being one of the most commercially significant grades. Unlike heat-treatable alloys such as 3003 aluminum sheets or 6061 aluminum, 1100 aluminum gains its strength through cold working (strain hardening) rather than precipitation hardening. This makes it exceptionally formable and workable, though it has relatively low mechanical strength compared to alloyed grades. For applications where purity, corrosion resistance, and formability are more important than high strength, 1100 aluminum is often the ideal choice.

The chemical composition of 1100 aluminum is defined by its minimum 99.0% aluminum content, with controlled limits on key impurity elements. The primary alloying elements and impurities include silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), zinc (Zn), and titanium (Ti). The relatively high purity of 1100 aluminum contributes directly to its excellent corrosion resistance, high electrical and thermal conductivity, and superior formability.

The table above shows that 1100 aluminum allows higher levels of silicon and iron compared to other 1xxx alloys. The copper content in 1100 aluminum (0.05-0.20%) is slightly higher than in 1050 or 1060, which provides a modest increase in strength. This composition balance makes 1100 aluminum an economical choice that still delivers excellent performance for a wide range of applications.

The mechanical properties of 1100 aluminum vary significantly depending on the temper (strain-hardened condition). As a non-heat-treatable alloy, 1100 aluminum achieves different strength levels through cold working, which increases hardness and tensile strength while reducing elongation. Understanding these properties is essential for selecting the right temper for your specific application.

As shown in the table, the annealed (O temper) condition offers the highest elongation (35-45%) but the lowest tensile strength (90 MPa). Conversely, the fully strain-hardened H18 temper provides the highest tensile strength (165 MPa) but only 3-6% elongation. The H14 temper, which represents approximately 50% cold work after annealing, offers a balanced combination of strength and formability that is popular for many general-purpose applications.

The physical properties of 1100 aluminum are characteristic of high-purity aluminum. These properties make it particularly suitable for applications requiring high thermal conductivity, electrical conductivity, and low density. The following table summarizes the key physical properties of 1100 aluminum alloy:

The thermal conductivity of 222 W/m·K places 1100 aluminum among the best thermal conductors in the aluminum alloy family. This property, combined with its excellent corrosion resistance and formability, makes it ideal for heat exchanger applications. The electrical conductivity of 57-62% IACS (International Annealed Copper Standard) is also quite high, making 1100 aluminum suitable for electrical conductor applications where high conductivity is needed.

1100 aluminum is available in several temper designations, each offering different combinations of strength, ductility, and formability. Since 1100 is a non-heat-treatable alloy, all temper strengthening is achieved through cold working (strain hardening). The most common tempers for 1100 aluminum include O (annealed), H12, H14, H16, H18, and H24. Understanding the differences between these tempers is critical for selecting the right material for your application.

The O temper is preferred when maximum formability is required, such as in deep drawing or spinning operations. The H18 temper provides maximum strength but with significantly reduced ductility. The H14 and H24 tempers are popular choices for general-purpose applications, offering a good balance between strength and formability. When ordering 1100 aluminum sheets or coils from HXM, customers can specify any of these tempers to meet their application requirements.

One of the most notable characteristics of 1100 aluminum is its excellent formability. The high purity of the alloy, combined with its face-centered cubic (FCC) crystal structure, gives it outstanding ductility and workability. In the annealed (O temper) condition, 1100 aluminum can be readily formed, bent, spun, drawn, rolled, and stamped into complex shapes without cracking or failure.

The formability rating of 1100 aluminum is among the highest of all aluminum alloys. It can be cold worked extensively, allowing for deep drawing operations with high reduction ratios. For applications requiring intricate forming — such as cookware, decorative trim, and fin stock — 1100 aluminum in the O temper is often the material of choice. Even in harder tempers like H14, 1100 aluminum retains good formability, making it versatile for a wide range of manufacturing processes.

In addition to excellent cold formability, 1100 aluminum offers good machinability. While not as machinable as free-machining alloys like 2011, it can be successfully machined using standard techniques with carbide or high-speed steel tooling. The recommended cutting speeds and feed rates should be adjusted to account for the alloy’s tendency to build up on cutting edges. Using appropriate lubricants and sharp tools helps achieve good surface finish and dimensional accuracy.

1100 aluminum exhibits excellent weldability using all standard welding methods, including gas tungsten arc welding (GTAW/TIG), gas metal arc welding (GMAW/MIG), resistance welding, and brazing. The high purity of the alloy means there are no alloying elements that could cause solidification cracking or other weldability issues. This makes 1100 aluminum one of the easiest aluminum alloys to weld.

The most commonly used filler wires for welding 1100 aluminum are ER1100 (matching filler) and ER4043 (Al-Si filler). ER1100 filler provides the best color match and maintains the purity of the base metal, making it ideal for applications where corrosion resistance is critical. ER4043 filler offers better fluidity and reduced crack sensitivity, making it suitable for general-purpose welding. The choice between these fillers depends on the specific application requirements and joint design.

1100 aluminum offers excellent corrosion resistance, particularly in atmospheric and chemical environments. This outstanding corrosion resistance is primarily due to the natural aluminum oxide (Al₂O₃) layer that forms spontaneously on the surface when exposed to air. This oxide layer is thin (approximately 4-10 nm), hard, transparent, and self-repairing — if scratched or damaged, it immediately reforms in the presence of oxygen.

The corrosion resistance of 1100 aluminum is superior to that of higher-alloyed grades in many environments. It performs exceptionally well in:

• Atmospheric exposure: Excellent resistance to rural, urban, and industrial atmospheres
• Fresh water: Highly resistant to both hard and soft water
• Sea water: Good resistance in marine environments
• Chemical environments: Resistant to many acids, including acetic, citric, and nitric acid (concentrated)
• Ammonia: Excellent resistance to ammonia and ammonium compounds

However, 1100 aluminum is not suitable for all chemical environments. It is attacked by strong alkalis (caustic soda), hydrochloric acid, and sulfuric acid. In applications involving these chemicals, protective coatings or alternative materials should be considered. For most B2B applications, the natural corrosion resistance of 1100 aluminum provides long service life with minimal maintenance requirements.

One of the largest application areas for 1100 aluminum is in the production of aluminum foil and packaging materials. The high purity, excellent formability, and non-toxic nature of 1100 aluminum make it ideal for food packaging, pharmaceutical blister packs, and household foil. 1100 aluminum foil can be produced in thicknesses ranging from 0.006 mm (6 microns) to 0.2 mm, with the thinner gauges commonly used for household and food packaging applications.

The excellent ductility of 1100 aluminum in the O temper allows it to be rolled to extremely thin gauges without tearing or pinholing. This is a critical requirement for foil production, where uniform thickness and defect-free surfaces are essential. Additionally, 1100 aluminum foil provides an excellent barrier to light, moisture, gases, and microorganisms, making it indispensable in the food and pharmaceutical packaging industries.

Beyond simple foil, 1100 aluminum is used to manufacture various packaging products including containers, trays, lids, and closures. The alloy can be readily laminated with paper, plastic films, or other materials to create multi-layer packaging that combines the barrier properties of aluminum with the mechanical strength of other materials. HXM Aluminum supplies 1100 aluminum coils and strip specifically for foil stock and packaging applications, with tight tolerances and consistent mechanical properties.

The excellent corrosion resistance of 1100 aluminum makes it a preferred material for chemical processing equipment. Storage tanks, pressure vessels, heat exchangers, piping systems, and reaction vessels fabricated from 1100 aluminum provide reliable service in environments involving acids, alkalis (with appropriate limitations), and various chemical solutions. The alloy’s high purity ensures minimal contamination of processed chemicals, which is critical in pharmaceutical and food-grade applications.

1100 aluminum chemical equipment is commonly used in:

• Storage tanks for acetic acid, citric acid, and other organic acids
• Pressure vessels for chemical processing
• Piping systems for chemical transport
• Heat exchanger shells and tube sheets
• Reaction vessels and process equipment

The following application suitability matrix provides a quick reference for selecting 1100 aluminum across different application areas:

1100 aluminum is widely used in electrical applications due to its high electrical conductivity (57-62% IACS). While not as conductive as 1350 aluminum (which is specifically designed for electrical conductor applications), 1100 aluminum offers a good balance of conductivity, formability, and mechanical strength. It is commonly used for bus bars, electrical connectors, cable sheathing, and heat sinks in electronic devices.

For bus bar applications, 1100 aluminum in the H14 or H18 temper provides sufficient mechanical strength to maintain structural integrity while offering excellent current-carrying capacity. The natural corrosion resistance of 1100 aluminum eliminates the need for additional protective coatings in most indoor electrical applications. Additionally, the alloy’s excellent thermal conductivity helps dissipate heat generated by electrical current flow, reducing the risk of overheating in high-current applications.

In the electronics industry, 1100 aluminum is used to manufacture heat sinks for computers, LED lighting, power supplies, and other electronic devices that require efficient thermal management. The alloy can be extruded, stamped, or machined into various heat sink geometries, including fin designs that maximize surface area for heat dissipation. The combination of thermal conductivity, formability, and cost-effectiveness makes 1100 aluminum a popular choice for thermal management solutions.

Heat exchangers represent another major application area for 1100 aluminum. The alloy’s high thermal conductivity (222 W/m·K), excellent formability, and corrosion resistance make it ideal for manufacturing heat exchanger components including fins, tubes, plates, and tubesheets. 1100 aluminum heat exchangers are used extensively in HVAC systems, automotive cooling, refrigeration, and industrial process cooling applications.

For fin stock production, 1100 aluminum is typically supplied in the H14 or H24 temper, which provides the necessary combination of formability (for fin forming operations) and mechanical strength (to maintain fin geometry during service). The fins are mechanically bonded to tubes — which may be made from 1100 aluminum or other alloys — through expansion or brazing processes. The resulting heat exchanger assemblies offer excellent heat transfer efficiency and long service life.

HXM Aluminum supplies 1100 aluminum fin stock in thicknesses ranging from 0.08 mm to 0.3 mm, with tight tolerance control on thickness, flatness, and mechanical properties. Our fin stock products are manufactured to meet the demanding requirements of heat exchanger manufacturers worldwide, with consistent quality and reliable performance.

The 1xxx series aluminum alloys differ primarily in their aluminum purity and minor element content. While all 1xxx alloys share similar characteristics — excellent corrosion resistance, high conductivity, and good formability — there are important differences that influence material selection for specific applications. The following table compares 1100 aluminum with other common 1xxx alloys:

1100 aluminum stands out as the most versatile of the 1xxx series, offering a balanced combination of properties at an economical price point. While 1060 and 1070 offer slightly higher purity and conductivity, 1100 provides marginally higher strength due to its copper content (0.05-0.20%). For most general-purpose applications, 1100 aluminum is the preferred choice due to its availability, cost-effectiveness, and well-rounded performance.

1100 aluminum is recognized by multiple international standards organizations, ensuring global consistency in composition, properties, and product specifications. Understanding these standards is essential for international trade and compliance with customer requirements. The following table provides a cross-reference of the most common international standards for 1100 aluminum:

HXM Aluminum manufactures 1100 aluminum products in compliance with all major international standards. Our quality management system is certified to ISO 9001, and we provide mill test certificates (MTC) with every shipment, documenting chemical composition, mechanical properties, and compliance with the specified standard. Customers can request compliance with specific standards (ASTM, EN, JIS, or GB/T) when placing orders.

As a leading Chinese aluminum manufacturer, HXM Aluminum offers comprehensive 1100 aluminum products for global B2B customers. Our manufacturing capabilities cover the full range of 1100 aluminum products, including:

• 1100 Aluminum Sheets: Thickness 0.2-6.0 mm, width up to 2000 mm, available in all standard tempers
• 1100 Aluminum Coils: Thickness 0.2-6.0 mm, with slit and mill-edge options
• 1100 Aluminum Foil: Thickness 0.006-0.2 mm, for packaging and industrial applications
• 1100 Aluminum Strip: Custom widths and thicknesses for stamping and forming
• 1100 Aluminum Plate: Thickness 6.0-200 mm for structural and tooling applications

Our state-of-the-art production facilities include continuous casting and hot rolling lines, cold rolling mills with automatic gauge control, annealing furnaces with precise temperature control, and advanced leveling and cutting equipment. We maintain strict quality control throughout the production process, from raw material inspection to final product testing, ensuring consistent quality that meets international standards.

HXM Aluminum serves customers across more than 40 countries, providing 1100 aluminum products for applications in packaging, chemical processing, electrical, HVAC, automotive, and construction industries. Our experienced export team handles all aspects of international shipping, documentation, and customs clearance, ensuring smooth delivery to any destination worldwide. Contact us today to discuss your 1100 aluminum requirements.