What 1100 Aluminum Coils Are
1100 aluminum is a commercially pure alloy with an aluminum content of at least 99.00 percent and small controlled amounts of iron, silicon and other elements. Because it is non-heat-treatable, its strength is adjusted by cold working and annealing rather than by heat treatment, which gives a range of tempers from the fully annealed O condition to the full-hard H18 condition. The coils are produced from high-purity ingots through melting with strict impurity control, continuous casting, multi-pass cold rolling and final annealing, so that thickness tolerance, surface quality and mechanical properties stay consistent along the full coil length.
Core Properties
1100 offers the natural advantages of pure aluminum. Corrosion resistance is excellent in atmospheric conditions, fresh water and mild chemicals, thanks to a self-protecting oxide layer, which makes the coils suitable for outdoor trim and moisture-exposed parts without extra anti-corrosion treatment. Formability is very good: the material bends, stamps, deep draws, rolls and welds easily, and even cold-worked tempers retain enough ductility for complex fabrication. Thermal conductivity is about 220 W/(mK) and electrical conductivity about 59 percent IACS, which supports heat transfer and electrical applications. The alloy is also one of the most cost-effective in the 1xxx series and is fully recyclable with minimal loss of quality.
Mechanical Properties by Temper
In the O temper, tensile strength is approximately 75 to 105 MPa, yield strength 30 to 50 MPa and elongation at least 25 percent, giving maximum ductility for deep drawing and stamping. In the H14 half-hard temper, tensile strength rises to about 110 to 140 MPa with elongation of at least 10 percent, a balanced condition for general-purpose parts such as architectural trim and containers. In the H18 full-hard temper, tensile strength reaches about 150 to 180 MPa with elongation of at least 5 percent, which suits load-bearing components such as structural brackets where rigidity matters more than formability.
Technical Specifications
Typical composition limits are iron up to 0.95 percent, silicon up to 0.95 percent, and copper, zinc and manganese each up to 0.05 percent. Coils are supplied in thicknesses from 0.1 to 6.0 mm, with thickness tolerances from plus or minus 0.02 mm on light gauges to plus or minus 0.1 mm on heavy gauges, widths from 800 to 2500 mm, coil weights from 300 to 5000 kg, and standard inner diameters of 508 or 610 mm. Surface options include mill finish, clear or colored anodizing, pre-coating and mirror or brushed polishing. The material is commonly supplied to ASTM B209, EN 485-2 and GB/T 3880, with food-contact compliance available for specific applications.
Applications
In architecture and construction, H14 and H18 coils are used for ceiling panels, gutter systems, window frames and decorative screens, where balanced strength and corrosion resistance give long outdoor service. In heat transfer and HVAC, thin-gauge coils become radiator fins, heat exchanger cores and air conditioner ducts. In packaging and consumer goods, the alloy is used for food containers, cosmetic tins and kitchen utensils, and in the electrical field for bus bars, wire insulation and enclosures where 1100 is a cost-effective alternative to copper. Industrial users specify H14 or H18 for containers, tooling fixtures and lightweight brackets, and O temper for deep-drawn valve and pump parts.
Processing and Handling Guidance
Coils should be handled with soft slings or rubber-coated hooks and stored in a dry, clean warehouse at 15 to 25 C with relative humidity at or below 60 percent, wrapped in moisture-resistant film for long-term storage. Cutting with sharp carbide blades keeps edges burr-free; thin gauges should be slit at reduced speed to avoid tearing. Minimum bend radii are about 2 times material thickness for O temper, 3 times for H14 and 4 times for H18, and pre-heating cold-worked tempers to 80 to 120 C improves ductility for deep forming. MIG or TIG welding with ER1100 filler at low current gives sound joints with minimal porosity, and aluminum or stainless fasteners should be used for mechanical joints to avoid galvanic corrosion.
Quality Assurance
Each coil is inspected for raw material purity, mechanical properties, thickness uniformity and surface quality, and a unique batch number allows full traceability from ingot to finished product. A material test report covering chemical composition and mechanical properties can be provided with every shipment, and tempers, thicknesses, widths and finishes can be customized to the production line. This makes 1100 coils a dependable and flexible choice for both high-volume production and custom fabrication.
FAQ
Can 1100 aluminum coils be anodized?
Yes. The high purity of 1100 gives a clear, uniform anodized film with consistent color, and anodizing is commonly applied to architectural and decorative parts. The coating thickness should follow the relevant anodizing standard for the application.
What is the difference between O, H14 and H18 tempers?
O is fully annealed and softest, with the highest ductility for deep drawing and stamping. H14 is half-hard with a balance of strength and formability for general fabrication. H18 is full-hard with the highest strength in the series and limited ductility, suited to parts that must resist bending.
Is 1100 suitable for food contact packaging?
1100 is widely used for food containers and packaging because it contains no toxic alloying additions. Where explicit compliance with food-contact regulations is required, the applicable standard for the destination market should be confirmed with the material certificate.
Why is 1100 used instead of copper for electrical parts?
1100 offers about 59 percent of the conductivity of copper at a much lower weight and cost. For low-to-medium current applications such as bus bars and enclosures, the designer can size the cross-section to achieve the required current capacity with a significant cost saving.
How should 1100 coils be stored long term?
Store coils vertically on dedicated racks in a dry, ventilated warehouse, keep them wrapped in moisture-resistant film, and avoid stacking so that surface damage and deformation are prevented.
Frequently Asked Questions
Q: Which alloy grades does this article cover? The article covers 1100 in aluminum coil form, and it compares how the different alloying systems affect strength, corrosion resistance and formability.
Q: What is the minimum aluminum content of the main grade? The lead grade 1100 contains at least 99.00 percent aluminum, which is the basis of its high purity, corrosion resistance and stable performance in processing.
Q: Which tempers are available for this product? Available tempers mentioned in the article include O, H18, so buyers can choose between softer, more formable states and harder, higher-strength states.
Q: What surface finishes can be supplied? Surface options covered in the article include mill finish, mirror, brush, anodized, coated, which suit everything from plain mill products to decorative and protective coatings.
Q: What are the main applications of this product? The article highlights its use in packaging, food, construction, heat exchanger, insulation, chemical, where the combination of light weight, corrosion resistance and formability provides the main benefit.