High-Precision Treated Rolled Copper Foil

High-Precision Treated RA Foil

High-Precision Treated Rolled Copper Foil

High-performance rolled copper foil with a roughened surface layer, CIVEN Metal's flagship product for the high-end circuit board market. The roughened layer, available in black or red, is firmly bonded with no powder shedding and offers very strong adhesion to substrates, along with excellent bend resistance and high-temperature stability: the ideal substrate high-end PCB and FPC manufacturers look for.

· Product Features

Black / red roughened layer
12 / 18 / 35 / 70 μm
Preferred for high-end PCBs

Product Story

The "Bonding Master" Built for High-End Circuit Boards

In multilayer PCB manufacturing, the bond between copper foil and substrate is the lifeline of the entire board's reliability. Delamination after reflow, blistering after thermal shock: these critical defects often stem from insufficient "intimacy" between the foil surface and the resin. CIVEN high-precision treated rolled foil was developed to solve exactly this problem.

Using a special process, we build on the rolled copper foil surface a layer of uniform, dense roughened structure, available in black or red. This is not simple physical roughening but a microstructure created by combined chemical and electrochemical treatment. Like countless tiny "anchors", it embeds deeply into epoxy or PI substrates, achieving an industry-leading peel strength of ≥ 1.2 N/mm.

More importantly, this roughened layer is extremely firm and does not shed powder during subsequent processing. Many engineers have had painful experiences with copper powder left between traces after etching causing shorts, or roughening particles contaminating chemical baths. CIVEN's treatment process makes the bond between the roughened layer and the base foil stronger than the cohesion of the roughened layer itself, eliminating powder shedding at the source.

As an inherent advantage of rolled foil, this material also offers excellent bend resistance: its fibrous crystal structure far outperforms electrodeposited foil in dynamic bending. Combined with a heat-resistant layer that does not discolor after baking at 200°C for 30 min, it performs reliably even under demanding process conditions.

12/18/35/70 μm

Standard thickness

520 mm

Standard width

Black / red

Roughened layer color

≥1.2 N/mm

Peel strength

Stable at 200°C

No oxidation at high temperature

Why CIVEN METAL

Why Choose CIVEN Metal?

🏆 CIVEN Metal's Technical Barriers in Treated Rolled Foil

Roughening may look simple, but achieving all four at once, "uniform roughening with no powder shedding, high peel strength, no discoloration at high temperature, easy etching with minimal undercut", requires deep process expertise. CIVEN Metal has invested heavily in R&D to overcome this challenge and has developed its own core formulations and process parameter system: this is our moat.

No-Shedding Roughening Technology

Our proprietary roughened layer reinforcement process makes the bond between roughening particles and base foil stronger than the particles themselves. Verified by tape peel tests and ultrasonic cleaning, the shedding rate is close to zero, a core capability competitors find hard to replicate.

Industry-Leading Peel Strength

Peel strength stable at ≥ 1.2 N/mm (tested with FR-4), with some grades exceeding 1.5 N/mm. In multilayer hot pressing, this creates an almost inseparable bond between the foil and the prepreg.

Easy Etching for Fine Lines

The etching rate of the roughened layer is precisely matched to the base foil, keeping the undercut ratio within 1:1. For HDI boards with line width/spacing below 50 μm, this directly determines yield.

Flexible Two-Color Options

Black and red roughened layers are available to meet customers' visual identification and process differentiation needs. Both colors have identical performance; only the appearance differs.

No Discoloration After High-Temperature Baking

No noticeable discoloration after baking at 200°C for 30 min, as the heat-resistant layer protects the integrity of the roughened layer. This is especially important for PCBs that go through lead-free reflow (peak temperature 260°C+).

In-Depth Service for the PCB Industry

CIVEN's technical team has a deep understanding of PCB processes and can help customers optimize stack-up design, choose the right roughening type and thickness, and provide failure analysis support. We don't just sell materials; we are your technical partner.

Applications

Where Is It Indispensable in High-End Manufacturing?

From smartphones to automotive electronics, CIVEN treated rolled foil supports cutting-edge circuit board manufacturing

High-End Multilayer PCBs

Core substrate for HDI boards, IC substrates and high-frequency, high-speed boards. Excellent adhesion of the roughened layer to FR-4/PI ensures long-term reliability of multilayer boards under thermal stress.

FPC Flexible Circuits

Copper foil for rigid-flex boards, COF tape and foldable-screen FPCBs. The fibrous crystals of rolled foil deliver far longer bending fatigue life than electrodeposited foil.

Copper Clad Laminates (CCL)

A key upstream material for FR-4, PI and metal-based copper clad laminates. CCL manufacturers count CIVEN among their strategic suppliers.

Automotive Electronics PCBs

In-vehicle control modules, power battery BMS boards and ADAS sensor circuits. Our IATF 16949 certified system ensures automotive-grade quality.

Communication Equipment

5G base station antenna boards, RF modules and microwave device substrates. Low loss and high adhesion are a perfect match for high-frequency, high-speed requirements.

Composite Materials

Conductor layers in copper-based, thermal and shielding composite materials. The roughened layer greatly improves interfacial bond strength with other materials.

Get In Touch

Let Us Find the Best Solution for Your Circuit Board Project

Whether you produce HDI boards or flexible circuits, CIVEN Metal can provide the right roughened layer solution. Free sample books, COA certificates, SGS test reports and vacuum-packed export service are all available.

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