Single-Side Roughened RA Copper Foil

Base Material: Electrolytic copper cathode (>= 99.99% purity).
Microstructure: Recrystallized equiaxed grain structure formed via multi-pass cold rolling and hydrogen-atmosphere continuous annealing.
Treatment Layer: Nodular micro-roughening on the matte side, sealed with an anti-oxidation passivation barrier (zinc-chromate/organic inhibitor) against copper migration. 

Interfacial Adhesion: Single-side roughness (Rz 1.0 um - 2.5 um) increases mechanical interlocking with polyimide (PI) or liquid crystal polymer (LCP) films, achieving peel strength >= 0.8 kN/m.

Signal Integrity: Untreated smooth side minimizes skin-effect insertion loss at GHz frequencies, preventing attenuation in high-speed transmission lines.

Dynamic Flexibility: Elongation rates > 20% withstand over 150,000 cycles of MIT folding tests without micro-fracturing.

Thermal Stability: Withstands multi-layer lamination at 200 deg C to 250 deg C without delamination or blistering.

Production Flow
Melting & Casting: Vacuum induction melting of high-purity copper into uniform ingots.
Reduction Rolling: Multi-pass Sendzimir milling to target thickness down to 12 um.
Continuous Annealing: Hydrogen-atmosphere thermal treatment for stress relief and grain orientation control.
Surface Treatment: Electrochemical node deposition on one side followed by passivation rinsing.
Slitting & Inspection: Automated edge-trimming and optical scanning.

Quality Assurance
Pinhole Detection: 100% online eddy-current inspection for subsurface voids.
Tension Control: Closed-loop hydraulic servo systems maintain uniform web tension during slitting to prevent edge waviness.
Traceability: Master coils carry laser-etched IDs linked to Mill Test Reports (MTR) covering atomic force microscope (AFM) roughness profiles, tensile metrics, and chemical composition. 

Foldable Device Hinges: Dynamic FPC layers subjected to continuous folding.
5G Antenna Modules: Transmission lines balancing low insertion loss with substrate peel strength.
Automotive Sensor FPCs: Rigid-flex circuits exposed to thermal cycling and vibration.
Medical Ultrasound Probes: High-density micro-coaxial and signal processing flex boards. 

Packaging Structure: Suspended wooden crates. Individual coils wrapped in anti-static VCI film, vacuum-sealed in moisture-barrier bags with desiccant, and secured with shock-absorbing foam inserts.
Lead Time: Stock items: 7 business days. Custom thickness/slitting runs: 15 to 25 business days.
Shipping Terms: FOB, CIF, or DDP via air/ocean freight with real-time temperature and humidity data loggers. 

Direct Mill Control: In-house operations from raw cathode processing to final slitting ensure batch-to-batch uniformity.
Tight Tolerance Control: Thickness variance maintained within +/- 5% to eliminate impedance mismatches in circuit designs.
Verified Technical Dat: Every shipment includes certified test reports validated via internal laboratory spectrometers and atomic force microscopes.