3105 Aluminum Strip

3105 aluminum strip is a commonly used material in the construction and manufacturing industries, mainly favored for its excellent corrosion resistance and formability. It is essentially an aluminum alloy with a purity of 98%, with small additions of manganese and magnesium, giving it higher strength than the 1100 and 3003 series aluminum alloys.

3105 aluminum strip is made from 3105 alloy and belongs to the 3000 series aluminum alloys. It is usually pre-painted and ready for direct use. It is non-heat-treatable, has relatively poor machining performance, but offers excellent weldability.

3105 aluminum strip

Thanks to its outstanding cost-performance ratio, 3105 aluminum strip is widely used in packaging, construction, home appliances, and other fields. It is an ideal material that combines lightweight properties, rust resistance, and ease of processing. When selecting 3105 aluminum strip, the appropriate temper (such as H14/H24) and specifications should be chosen according to the specific application to meet requirements for strength, ductility, and processing performance.

3105 Aluminum Strip Specifications

Item	Specification
Thickness	Typically 0.2–6 mm (Customizable)
Width	20–1600 mm (Custom slitting available)
Temper	O (Soft), H14 (1/4 Hard), H24 (1/2 Hard), H18 (Hard)
Length	Coil form or cut-to-length as required
Surface Treatment / Coating	Pre-painted PE, PVDF coating, or anodized for enhanced durability

3105 Aluminum Strip Available Finishes

3105 Pre-painted Aluminum Strip

PE or PVDF coatings are pre-applied to the surface of 3105 aluminum strip, offering rich color options (such as white and orange) and excellent decorative weather resistance. The material can be directly stamped and formed.

3105 Mill Finish Aluminum Strip

Retains the original metallic surface after rolling of the 3105 aluminum alloy, without any artificial coating. It is commonly used as a base material for bottle caps, stamped parts, or further coating and deep processing.

3105 Stucco Embossed Aluminum Strip

Uniform orange peel or diamond patterns are formed on the surface of the 3105 aluminum strip through mechanical embossing. This not only enhances structural strength but also effectively reduces light reflection and conceals scratches.

3105 Anodized Aluminum Strip

A dense and transparent oxide film is formed on the surface of the 3105 aluminum strip through an electrochemical process, significantly improving surface hardness, corrosion resistance, and metallic appearance.

3105 Pre-painted Aluminum Strip

It is usually produced in factories through a continuous roller coating process. The coating is not only aesthetically pleasing but also provides an additional protective layer.

Common colors: White (White): the most widely used, including Polar White, High Gloss White, Matte White, etc. It is extensively applied in garage doors, awnings, and interior ceilings.
Orange (Orange): commonly used for safety signage, construction machinery decoration, or specific brand customization.
Others: black, red, blue (such as Chevron Blue), yellow, etc., usually customizable according to the RAL color chart or Pantone system.

Coating types:

PE (Polyester): suitable for indoor decoration and advertising signage.
PVDF (Fluorocarbon): offers outstanding weather resistance and UV protection, making it ideal for outdoor building facades and roofing, with color durability exceeding 20 years.

3105 Mill Finish Aluminum Strip

Appearance: the original condition after aluminum processing, featuring a natural metallic luster, but may have slight processing marks or oil stains.
Applications: usually used as a semi-finished material for subsequent deep stamping, forming, or user-applied coating.

3105 Stucco Embossed Aluminum Strip

Appearance: orange peel or diamond patterns formed on the surface through pressure processing.
Advantages: increased surface area (beneficial for heat dissipation), enhanced structural strength, and effective concealment of scratches and glare.
Applications: refrigerator liners, pipe insulation cladding, and anti-slip treads.

3105 Anodized Aluminum Strip

Although 3105 is a manganese-based alloy (3000 series) and its anodizing effect is not as good as that of the 5000 series, it can still undergo basic anodizing to enhance corrosion resistance.

3105 Aluminum Strip Features

Non-heat-treatable alloy: its strength is achieved through cold working (strain hardening) rather than heat treatment.
Corrosion resistance: highly resistant to atmospheric corrosion, making it very suitable for outdoor and marine environments.
Weldability: suitable for all standard welding techniques (MIG, TIG, and arc welding), with excellent welding performance.
Formability: excellent processing performance; it can be easily bent, stamped, or drawn without cracking.
Moderate strength: due to its higher manganese content, its strength is slightly higher than that of 3003 alloy.
Surface treatment: smooth surface that can be painted or coated for decorative purposes.
Lightweight: retains the inherent lightweight advantage of aluminum.
Good rust resistance: naturally forms a dense oxide film, resistant to atmospheric corrosion, suitable for humid environments.
Good electrical conductivity: contains 0.3% copper, with electrical conductivity reaching 41% IACS, close to the level of pure aluminum.

3105 Aluminum Coil Chemical Composition

Element	3105
Silicon	0.6
Iron	0.7
Copper	0.30
Manganese	0.30-0.8
Magnesium	0.20-0.8
Chromium	0.20
Zinc	0.40
Titanium	0.10
Aluminum	balance
Other Elements (each)	0.05
Other Elements (total)	0.15

3105 Aluminum Coil Mechanical Property Limits

Temper	Specified Thickness(in)	Tensile Strength - KSI				Elongationin 2 inches %
		Ultimate		Yield
		Min	Max	Min	Max
H12	0.017 - 0.019	19	26	15	-	1
H12	0.020 - 0.031	19	26	15	-	1
H12	0.032 - 0.050	19	26	15	-	2
H12	0.051 - 0.080	19	26	15	-	3
H14	0.013 - 0.019	22	29	18	-	1
H14	0.020 - 0.031	22	29	18	-	1
H14	0.032 - 0.050	22	29	18	-	2
H14	0.051 - 0.080	22	29	18	-	2
H16	0.013 - 0.031	25	32	21	-	1
H16	0.032 - 0.050	25	32	21	-	2
H16	0.051 - 0.080	25	32	21	-	2
H18	0.013 - 0.031	28	-	24	-	1
H18	0.032 - 0.050	28	-	24	-	1
H18	0.051 - 0.080	28	-	24	-	2
H25	0.013 - 0.019	23	-	19	-	2
H25	0.020 - 0.031	23	-	19	-	3
H25	0.032 - 0.050	23	-	19	-	4
H25	0.051 - 0.080	23	-	19	-	6
O	0.013 - 0.019	14	21	5	-	16
O	0.020 - 0.031	14	21	5	-	18
O	0.032 - 0.080	14	21	5	-	20

Common Applications of 3105 Aluminum Strip

Application Field	Typical Temper	Thickness Range (mm)	Surface Treatment
Wine / Pharmaceutical Bottle Caps	H14, H16	0.20 - 0.25	Color coating + protective lacquer + food-grade lubricant
Venetian Blinds	H19, H48	0.15 - 0.21	Precisely color-matched PE roller coating
Building Rain Gutters	H24	0.60 - 1.00	PVDF / PE high-durability coating (embossing optional)
Transformer Windings	O	0.30 - 2.50	Clean mill finish + rounded edges (burr-free)

3105 H14 H16 Aluminum Closure Strip

This type of application requires an excellent balance between ductility and strength to ensure that the caps do not crack after stamping and achieve a tight seal.

Common tempers: H14, H16 (half-hard). H14 provides good stamping performance, while H16 offers higher strength and is suitable for pressure-resistant caps for carbonated beverages.

Typical specifications:

Thickness: 0.20mm - 0.25mm (most common).
Width: 50mm - 1000mm (slit according to die layout).

Surface treatment:

Pre-painted / Lacquered: double-sided coating. The front side is usually coated with colored polyester (PE) paint, while the back side is coated with protective epoxy clear varnish.
Oiling (DOS Oiling): to facilitate stamping, an ultra-thin layer of food-grade DOS lubricant is often applied to the surface.
Chromated: enhances coating adhesion.

3105 H19 H48 Aluminum Strip for Venetian Blind

Venetian blind slats require extremely high elasticity and ultra-thin gauges.

Common tempers: H19 or H48 (extra hard). Through heavy cold rolling deformation, the material gains spring-like resilience, allowing it to quickly recover after bending under stress.

Typical specifications:

Thickness: 0.15mm - 0.21mm (ultra-thin).
Width: 12.5mm, 15mm, 16mm, 25mm, 35mm, 50mm.

Surface treatment:

Color coating: the surface is coated with high-durability polyester paint, usually requiring highly consistent color and strong UV fade resistance.

3105 H24 H26 Aluminum Strip for Rain Gutter

This type of application is mainly processed by continuous roll-forming machines on-site or in factories, requiring excellent corrosion resistance and ease of bending.

Common tempers: H24, H26 (partially annealed after coating). This ensures that the aluminum strip can be bent at 90° or 180° without coating delamination or base metal cracking.

Typical specifications:

Thickness: 0.6mm - 1.2mm.
Width: 200mm - 500mm (common developed widths are 11.75 inches or 15 inches).

Surface treatment:

PVDF coating: for high-end architectural applications, providing more than 20 years of weather resistance. PE coating: standard for general residential use, offering a wide range of colors (such as white, brown, and gray). Embossed: diamond or orange peel patterns may be applied to enhance structural strength and conceal minor scratches.

3105 Transformer Aluminum Strip

In certain industrial transformers, 3105 is used to replace pure aluminum strips (1050 / 1060), providing better creep resistance.

Common temper: O temper (fully annealed). Only the fully soft condition can ensure excellent electrical conductivity and allow tight winding.

Typical specifications:

Thickness: 0.3mm - 2.5mm.
Width: 10mm - 1200mm.

Surface treatment:

Mill finish: requires an extremely clean surface, free from oil stains and burrs.
Rounded edge: a critical process. The strip edges must be rounded to prevent puncturing insulation paper or causing partial discharge due to sharp edges during operation.

Advantages of 3105 Aluminum Strip

Excellent corrosion resistance in outdoor and humid environments
Can be deep drawn or bent without cracking
Lightweight and durable, suitable for long-term applications
Can be coated or painted for decorative and protective purposes

Comparison of 3105 Aluminum Strip with Similar Alloys

Alloy	Main Advantages	Typical Applications
3105	Higher strength, good electrical conductivity, moderate cost	General-purpose applications, packaging, construction, home appliances
3003	Better ductility, slightly lower cost	General forming processes, signage
1100	Higher purity (99%), best electrical conductivity, lower price	Electrical materials, decorative applications
5052	Higher strength, better corrosion resistance, higher cost	High-strength structural components, marine applications

3105 Aluminum Strip vs. 3003

Although both belong to the 3000 series alloys, 3105 is generally more suitable for exterior architectural products. Compared with 3003, its magnesium content provides slightly higher strength and better corrosion resistance in salty or humid air. However, 3003 typically offers better elongation, making it more suitable for deep drawing applications such as cookware manufacturing.

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