1100 Aluminum Circle

1100 aluminum circle: 99.0% pure aluminum disc for cookware, lighting reflectors, road signs, and electrical components. Available in O, H14, H16 temper. Thickness 0.3–6.0 mm, diameter 100–1,500 mm. Food contact compliant. Custom sizes available. Contact us for pricing and samples.

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Introduction

1100 aluminum circle is a round disc made from 1100 aluminum sheet — the purest aluminum alloy in commercial use, with a minimum aluminum content of 99.0%. It is also called aluminum disc or aluminum circle blank.

Because 1100 contains no major alloying additions, it is the softest and most formable aluminum alloy available. It deep-draws and spins without cracking. It conducts heat evenly. It passes food-contact safety requirements in all major markets. These properties make it the global standard material for cookware blanks, lighting reflectors, road signs, and dozens of other stamped or spun aluminum products.

Key properties at a glance:

Density: 2.71 g/cm³ — lightweight
Thermal conductivity: 222 W/m·K — excellent for cookware
Electrical conductivity: 37.7 MS/m (~57% of copper)
Food contact compliant: meets FDA and EU regulations
Surface: accepts anodizing, painting, and non-stick coating well

Chemical Composition of 1100 Aluminum Circle:

Element	Content
Aluminum (Al)	99.0% minimum
Copper (Cu)	0.05–0.20%
Silicon + Iron (Si + Fe)	0.95% maximum (combined)
Manganese (Mn)	0.05% maximum
Zinc (Zn)	0.10% maximum
Other elements	0.15% total maximum

The small copper addition (0.05–0.20%) provides a slight strength increase without reducing formability or corrosion resistance. Iron and silicon are strictly controlled as impurities to keep the alloy pure.

Mechanical Properties by Temper:

Temper	Tensile Strength	Yield Strength	Elongation	Typical Use
O (annealed)	75–105 MPa	25–35 MPa	25–35%	Deep drawing, spinning, cookware
H12	95–130 MPa	75 MPa min	12%	Light forming, bottle caps
H14	110–145 MPa	95 MPa min	9%	General fabrication, signs
H16	130–165 MPa	115 MPa min	6%	Stiff formed parts
H18	150 MPa min	145 MPa min	4%	Rigid discs, minimal forming

For cookware and deep-drawn products, the O (annealed) temper is the standard specification. For aluminum circle signs and decorative parts, H14 or H16 is preferred.

Standard Size Range:

Parameter	Range
Thickness	0.3 mm – 6.0 mm
Diameter	100 mm – 1,500 mm
Temper	O, H12, H14, H16, H18
Surface	Mill finish, bright finish, anodized
Material	Hot rolled / Cold rolled

Common Cookware Circle Sizes:

Application	Diameter	Thickness
Small frying pan blank	200–250 mm	1.5–2.5 mm
Standard frying pan blank	280–320 mm	2.0–3.0 mm
Wok blank	360–400 mm	2.0–3.0 mm
Pressure cooker body	220–280 mm	2.5–4.0 mm
Pot blank	260–340 mm	2.0–3.5 mm
Rice cooker inner bowl	200–260 mm	1.5–2.5 mm

Custom thickness, diameter, and edge finish available to order. Minimum order quantity for custom sizes: 1–3 metric tonnes.

1100 vs 3003 Aluminum Circle: Which Should You Order?

This is the most common question from cookware and fabrication buyers. Both alloys are used for similar applications. Here is the key difference:

Property	1100	3003
Aluminum purity	99.0% minimum	~98.6% (1.0–1.5% Mn added)
Elongation (O temper)	25–35%	20–30%
Tensile strength (O temper)	75–105 MPa	95–130 MPa
Thermal conductivity	222 W/m·K	190 W/m·K
Food contact compliant	Yes	Yes
Price per kg	Slightly higher	Standard

Choose 1100 when: maximum formability for deep-drawn shapes, highest thermal conductivity for cookware, or food-contact purity compliance is required.
Choose 3003 when: slightly more strength is needed, or 3003 pricing is more competitive for your order size.

Send your specification to zxaluminum01@gmail.com and we will reply within 24 hours with pricing and availability.

Market

1100 aluminum circles are used across a wide range of industries. The main applications are:

Cookware and Kitchen Products

The largest application worldwide. 1100 aluminum circle is the standard blank for frying pans, woks, pressure cooker bodies, pots, rice cooker bowls, and tiffin boxes. The O-temper material deep-draws and spins without cracking. Thermal conductivity of 222 W/m·K ensures even heat distribution. The alloy meets FDA and EU food contact regulations.

Aluminum Circle Signs

Round disc signs for road signs, parking signs, directional signs, and decorative outdoor signage. The circle is punched, painted, or reflective-sheeted on the face. 1100-H14 or H16 is standard — lightweight, easy to drill or punch, and holds painted surfaces well.Lighting Reflectors and Lamp Covers

Stamped or spun into lamp reflectors, LED heat sinks, and light housings. Mill finish 1100 achieves 80–85% specular reflectance. Bright-anodized 1100 achieves over 95% reflectance — the highest available in aluminum — making it the preferred material for precision optical reflectors.

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Electrical and Capacitor Applications

Capacitor case discs, transformer winding components, conduit end caps, and electrical housing blanks. The high electrical conductivity and soft temper allow precise stamping with minimal springback.

Spray Bottle Caps and Cosmetic Packaging

Aluminum circle blanks are used as the base for spray bottle caps and cosmetic closures, where a clean mill finish surface and consistent thickness are required for leak-free sealing.

Decorative and Promotional Items

Medals, trophy plates, engraving blanks, and promotional discs. Available in anodized colors: clear, red, blue, gold, and black. Easy to engrave, stamp, or hand-form.

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