Rolled Annealed Copper Foil

Rolled annealed copper foil is a thin, flexible sheet of copper that has been processed through rolling and annealing to achieve specific mechanical and electrical properties. It is widely used in industries such as electronics, telecommunications, and energy due to its excellent conductivity, flexibility, and durability.

 

Rolled Annealed Copper Foil primarily enhances its crystallinity and lattice defect state through the alternating processes of heating and cooling, thereby improving the overall properties of the metal material. Typically, the foil is heated to temperatures ranging from 650°C to 800°C, held at this temperature for a specific duration, and then cooled using appropriate methods. This annealing process effectively eliminates structural defects, increases grain size, and enhances the plasticity and mechanical properties of the copper foil, making it more suitable for demanding applications. Below is a detailed overview of rolled annealed copper foil, including its manufacturing process, properties, and applications.

 

 

Thickness	0.10/0.012/0.018/0.025/0.035mm			Width	≤520mm
Item		Unit	Parameter
Thickness		MM	0.010	0.012	0.018	0.025	0.035
Grade		－	C1100	C1100	C1100	C1100	C1100
Copper content		%	≥99.95	≥99.95	≥99.95	≥99.95	≥99.95
Area Weight		g/m2	89±3	107±4	160±5	222±7	305±10
Roughness	(RA)	Um	≤0.15	≤0.15	≤0.15	≤0.15	≤0.15
	(RZ)	Um	≤1.7	≤1.7	≤1.7	≤1.7	≤1.7
Tensile Strength(MP)	State normal	Mpa	≥360	≥380	≥400	≥400	≥400
	State temper (180℃)	Mpa	≥160	≥160	≥160	≥160	≥160
Elongation(%)	State normal	%	≥1.0	≥1.2	≥1.4	≥1.4	≥1.4
	state temper l(180℃)	%	≥7	≥8	≥10	≥10	≥10
MIT	State normal	Time	≥2400	≥2400	≥2400	≥2400	≥2400
	state temper (180℃)	Time	≥2400	≥2400	≥2400	≥2400	≥2400
Peel strength		N/mm	≥0.8	≥1.0	≥1.3	≥1.35	≥1.4
High temperature oxidation resistance(180℃ 1hour)		－	Qualified	Qualified	Qualified	Qualified	Qualified

 

 

Temper	JIS Temper	Tensile Strength Rm/N/mm 2	Elongation A50/%	Hardness HV
M	O	220~275	≥ 15	50~70
Y4	1/4H	240~300	≥ 9	65~85
Y	H	330~450	-	100~140
T	EH	380~510	-

 

 

• High Electrical Conductivity

Rolled annealed copper foil retains the excellent electrical conductivity of pure copper, making it ideal for electrical and electronic applications.

Thermal Conductivity

It exhibits high thermal conductivity, which is beneficial for heat dissipation in electronic devices.

• Flexibility and Ductility

The annealing process enhances the foil's flexibility, allowing it to be easily bent, folded, or shaped without cracking.

• Corrosion Resistance

Copper foil has good resistance to corrosion in various environments, though it may tarnish over time when exposed to air.

• Surface Smoothness

Rolled and annealed copper foil typically has a smooth surface, which is crucial for applications like printed circuit boards (PCBs).

• Uniform Thickness

The rolling process ensures consistent thickness across the foil, which is critical for precision applications.

 

 

RA copper foil begins as a thick copper ingot, which is then repeatedly passed through rolling mills to reduce its thickness while undergoing intermediate annealing (heat treatment) to relieve internal stresses . This cycle of rolling and annealing continues until the desired final thickness is achieved, typically ranging from 6μm to 100μm . After rolling, the foil undergoes surface treatment to enhance adhesion and oxidation resistance

• Rolling

Copper is initially cast into thick slabs or ingots.

These slabs are then passed through a series of rolling mills to reduce their thickness to the desired foil dimensions (typically ranging from a few micrometers to several millimeters).

• Annealing

After rolling, the copper foil undergoes annealing, a heat treatment process where it is heated to a specific temperature and then slowly cooled.

Annealing relieves internal stresses, improves ductility, and enhances the foil's flexibility and workability.

• Surface Treatment

The foil may undergo additional treatments, such as cleaning, polishing, or coating, to improve surface quality and suitability for specific applications.

 

 

 

Feature	RA Copper	ED Copper
Manufacturing	Mechanical rolling + annealing	Electroplating onto a drum
Crystal Structure	Layered / equiaxed	Columnar / pillar
Flexibility	High (dynamic applications)	Low (static applications)
Flex Cycles	>1,000,000	~1,000
Surface	Smooth	Rough (better adhesion)
Cost	Higher	Lower
Typical Use	Moving/folding electronics	Stationary FPCs, batteries

 

 

• The Rolled copper foil with soft temper used as a conductor in the apparel for cancer treatment research from our Indonesia customer.

• Our ED Shielding Copper Foils with High Elongation and High Tensile Strength, can be used in many areas. We can provide the specific single-matte, double-matte, and double-shiny ED Copper for the Li-ion Battery. And we can also offer 2oz to 6oz ( nominal thickness 70um to 210um) Shielded ED Copper Foils used for shielding of electric products, especially as transformer, cable, mobile phone, computer, mechanical treatment, aerospace, and industry Applications . What is more, HTE (high temperature elongation) from 1/2oz to 2oz thickness copper foil and VLP-HTE-HF( very-low-profile, high temperature elongation, and heavy ED Copper Foils, used in PCB, which the max dimension is 1295mm x 2450mm.Below is the US customer Feedback pics for the Shielding Copper Foils used in MRI Room

 

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• Electronics:Used in printed circuit boards (PCBs), flexible circuits, and electromagnetic shielding due to its conductivity and flexibility.
• Batteries:Serves as a current collector in lithium-ion and other types of batteries.
• Telecommunications:Employed in cables, connectors, and RF shielding components.
• Energy:Used in solar panels, transformers, and other energy-related devices.
• Decorative and Artistic Uses:Its malleability and aesthetic appeal make it suitable for decorative art, crafts, and architectural elements.
• Industrial Applications:Used in gaskets, seals, and thermal management systems.

 

 

 

Q1: What is Rolled Annealed (RA) Copper Foil?

A:Rolled Annealed copper foil, commonly referred to as RA copper foil, is a type of copper foil manufactured through a mechanical rolling and annealing process rather than electrochemical deposition

 

Q2:How does RA Copper Foil compare to ED (Electrodeposited) Copper Foil?

A:This is the most frequently asked question in the industry. RA and ED copper foils differ fundamentally in manufacturing method, microstructure, and performance characteristics.

 

Q3:Why is RA Copper Foil more flexible than ED Copper Foil?

A:The superior flexibility of RA copper foil is directly related to its unique grain structure

 

Q4:What are the main applications of RA Copper Foil?

A:RA copper foil is specified for applications requiring superior flexibility, smooth surface characteristics, or high reliability under dynamic stress

 

Q5: What info. should I let you know if i would like to get a quotation for the the Rolled copper foil?

A: The material size (Thickness*Width*Length and total Qty). If possible, it would be more better to advise the application of the product, Then we can recommend the most suitable products with details for confirmation.

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