9μm Standard RA Copper Foil

Base Material: Cathode copper (>=99.9% purity, ASTM C11000 / C10200 equivalent) processed to minimize internal inclusions.
Microstructure: Recrystallized equiaxed fine-grain orientation via controlled hydrogen-nitrogen atmosphere thermal treatment.
Surface Condition: Untreated or chemically passivated to suppress surface tarnishing and preserve adhesion stability prior to resin lamination. 

Dimensional Control: Thickness maintained within +/-0.3um to prevent localized impedance variations.
Flexural Endurance: Withstands >15,000 cycles in MIT folding endurance tests (1 mm radius, 4.9 N load) without micro-cracking.
Mechanical Strength: Tensile strength of 300 to 380 MPa with 5% to 12% elongation depending on thermal temper.
Surface Profile: Matte side Rz <= 1.2 um, shiny side Rz <= 0.6 um, optimized for chemical etching and adhesive peel strength.
Electrical Properties: Conductivity >= 98% IACS at 20 deg C. 

Melting & Casting: Vacuum induction melting of high-purity copper cathodes into oxygen-free rolling ingots.
Precision Cold Rolling: Multi-high rolling mills equipped with Automatic Gauge Control (AGC) and online X-ray thickness monitoring.
Strand Annealing: Continuous thermal processing lines under protective reducing atmospheres to eliminate internal stress.
Slitting & Edge Finishing: Shear and razor slitting producing burr-free edges (<= 5 um height) to prevent dielectric piercing during lamination.
Inspection & Testing: 100% automated optical surface scanning for pinholes and inclusions, backed by destructive tensile and peel testing per production lot. 

Flexible Printed Circuit Boards (FPCs): Conductor layers in multi-layer rigid-flex boards for foldable displays, smartphones, and wearables.
EMI Shielding Films: Conductive shielding layers for high-frequency communication modules and internal harness wraps.
Automotive Sensor Harnesses: Signal routing tracks exposed to continuous thermal cycling and mechanical vibration.
Battery Current Collectors: Ultra-thin conductive substrates for specialized secondary energy storage cells. 

Width Slitting: Custom widths from 20 mm to 600 mm (+/-0.1 mm tolerance).
Length Options: Standard master rolls up to 3000 m or custom wound lengths matching specific lamination machine capacities.
Surface Passivation: Tailored anti-oxidation treatments compatible with specific adhesive systems (acrylic, epoxy, polyimide).
Packaging Configuration: Core diameters (3 inches or 6 inches), horizontal/vertical suspension mounts, and vacuum-sealed barrier packaging. 

Inner Protection: Wrapped in VCI (Volatile Corrosion Inhibitor) film and suspended inside reinforced wooden crates using non-contact plastic flanges to eliminate edge impact.
Outer Protection: Heavy-duty corrugated outer casing secured on fumigation-free export pallets with moisture-barrier wrapping.
Logistics: Shipped via air or ocean freight with real-time temperature and humidity dataloggers available upon request. Lead time: 2–4 weeks for standard catalog configurations. 

Vertical Integration: Complete in-house control over the manufacturing chain from precision cold rolling to slitting and packaging.
Lot Traceability: Each master coil carries a unique barcode linked directly to raw material mill test reports and inline QA verification data.
In-House Testing Facility: Certified laboratory execution of tensile strength, elongation, surface roughness, and conductivity checks for every production batch.
Compliance Standards: Manufacturing systems certified to ISO 9001 and ISO 14001, ensuring strict alignment with REACH and RoHS material directives.