High-Precision Pure Copper Foil

Ultra-high-purity rolled copper foil with copper content of at least 99.99%, CIVEN Metal's flagship precision foil. From micron-scale traces in flexible circuits to efficient current collectors in lithium batteries, its exceptional purity and surface precision make it one of the most trusted conductor materials in high-end electronics manufacturing.

· Product Features

C1100 / T2 / C1020
Purity ≥ 99.99%
RA rolling process

Product Story

When Purity Becomes the Standard

In high-end electronics manufacturing, every micron of impurity can affect the reliability of the entire system. CIVEN Metal high-precision pure copper foil contains at least 99.99% copper, a figure that reflects our relentless pursuit of excellence in raw material selection, melting control and rolling.

When copper foil just 9 microns thick is etched into fine traces, its surface finish directly determines trace integrity and signal transmission stability. Our rolled-annealed (RA) process gives the material a fibrous crystal structure that maintains excellent fatigue resistance under repeated bending, the core property that flexible circuit boards and foldable devices depend on.

More importantly, we understand the real challenges our downstream customers face: adhesion problems in coating, oxidation and discoloration during high-temperature reflow, and surface degradation after long-term storage. That is why every roll of CIVEN high-precision pure copper foil undergoes dual surface treatment: degreasing ensures excellent coating adhesion, while passivation keeps the color unchanged at transient temperatures of 110°C.

From thickness tolerance of ±1 μm to width tolerance of ±0.1 mm, these numbers are not cold technical specs but our commitment to consistency in every batch we deliver. For high-volume electronics manufacturers, material stability is what keeps production lines efficient.

9–90 μm

Thickness range

±1 μm

Thickness tolerance

150–640 mm

Width range

≥101% IACS

Electrical conductivity

110°C

Heat resistant, no oxidation

Why CIVEN METAL

Why Choose CIVEN Metal?

🏆 CIVEN Metal's Core Strengths

In the rolled copper foil industry, technical specifications can be copied, but a dedication to quality and a deep understanding of customers cannot. With many years in non-ferrous metal processing, CIVEN Metal has built a fully traceable quality control system from raw material sourcing to final inspection. Every roll of foil ships with a complete certificate of analysis (COA), so you can use it with confidence.

Purity-First Strategy

CIVEN uses only 4N-grade or higher high-purity cathode copper as raw material, controlling impurities at the source. Our melting shop tests every melt with a spectrometer to keep copper content consistently above 99.99%. This commitment to purity keeps our foil ahead of competitors in key properties such as electrical conductivity, thermal conductivity and oxidation resistance.

Exclusive Dual-Effect Surface Treatment

The combined degreasing + passivation surface treatment is CIVEN Metal's signature process. Degreasing thoroughly removes rolling oil residue, greatly improving adhesion in subsequent coating and lamination, while a specially formulated passivation solution forms a dense protective film that prevents oxidation and discoloration at 110°C, an industry-leading level of performance.

Micron-Level Precision Control

Thickness tolerance within ±1 μm and width tolerance of ±0.1 mm: more than a numbers game, this reflects CIVEN Metal's years of rolling know-how. With in-line thickness gauges and laser width measurement systems, we inspect 100% of output to ensure every meter delivered meets the promised specifications.

Flexible Customization & Fast Response

Unlike the standardized production of large mills, CIVEN Metal specializes in small- and medium-batch customization. Whether you need special thicknesses, non-standard widths or specific tempers (soft / half hard / hard), we respond quickly. Standard orders are delivered within 7 working days, and urgent samples ship within 48 hours.

Global Delivery Capability

CIVEN Metal products are exported to many countries and regions across Asia, Europe and North America. Our vacuum-packed export service keeps material surfaces intact after long sea voyages, and our multilingual technical support team is ready to answer overseas customers' inquiries.

Comprehensive Certifications

ISO 9001 quality management system certification, IATF 16949 automotive quality management certification, RoHS compliance: more than certificates, these are CIVEN Metal's quality commitment to every customer. We also offer free sample books and technical consulting to help you with selection and application.

Applications

Where Is It Used?

From consumer electronics to new energy power systems, CIVEN high-precision pure copper foil is found throughout high-end manufacturing

FPC Flexible Circuits

The preferred flexible substrate for foldable phones and wearables. The fibrous crystal structure from RA rolling keeps the foil from breaking even after tens of thousands of bending cycles, an advantage electrodeposited foil cannot match.

Lithium-Ion Batteries

As the copper substrate for anode current collectors or composite current collectors, its ultra-high purity and uniform thickness safeguard battery energy density and safety. Several leading battery manufacturers have added CIVEN to their qualified supplier lists.

EMI Shielding

In 5G communication equipment and precision instruments, high-precision pure copper foil is the material of choice for EMI shielding gaskets and RFID antenna substrates thanks to its excellent conductivity and shielding effectiveness.

Thermal Management

Thermal conductivity of ≥ 400 W/(m·K) makes it an ideal carrier for vapor chambers, LED heat dissipation modules and graphene composite heat-spreading substrates, helping solve thermal management challenges in high-power devices.

Precision Electronic Components

Precision components such as lead frames, connector terminals and spring contacts rely on the foil's tight dimensional control and excellent mechanical properties, an area where CIVEN products excel.

Architectural Decoration

In premium decorative appliqués and artistic inlay foils, high-precision pure copper foil is favored by designers and craftspeople for its natural copper luster and excellent ductility.

Get In Touch

Let Us Find the Best Solution for Your Project

Whether you need standard specifications or a fully customized copper foil solution, CIVEN Metal's technical team is here to help. Free sample books, COA certificates, SGS test reports and vacuum-packed export service are all available.

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