12μm High-Precision RA Copper Foil

Base Metal: High-purity cathode copper (C11000 / Cu-ETP or C10200 / OF-Cu).
Microstructure: Equiaxed grain structure achieved via precision annealing, eliminating directional mechanical anisotropy.
Surface Treatment: Anti-oxidation passivation layer applied to inhibit atmospheric oxidation and enhance resin lamination bonding. 

Dimensional Uniformity: Thickness controlled within +/- 0.3um across a 1200 mm web width, preventing local impedance variations.
Dynamic Flexibility: Withstands > 15,000 MIT folding endurance cycles without micro-cracking for sliding FPCs and hinge areas.
Signal Integrity: Minimized skin effect attenuation at frequencies exceeding 10 GHz due to low profile characteristics.
Thermal Stability: Retains tensile strength up to 180°C during multi-layer PCB lamination cycles. 

Cold Rolling: Multi-roll precision Sendzimir mills equipped with automatic gauge control (AGC) maintain strict thickness tolerances.
Controlled-Atmosphere Annealing: Continuous strand annealing furnaces utilize hydrogen-nitrogen mixed gas to eliminate surface oxidation and control grain growth.
Surface Inspection: 100% online optical defect detection systems identify pinholes and inclusions at speeds up to 100 m/min.
Laboratory Verification: Lots verified via universal tensile testers, laser profilometers, and four-point probe resistivity meters. Mill Test Certificates (MTC) issued per lot. 

Flexible Printed Circuit Boards (FPCs): Dynamic flexing zones in mobile devices and automotive displays.
5G Telecommunication Modules: High-frequency transmission lines and antenna substrates requiring low insertion loss.
Lithium-Ion Batteries: Specialized current collector foils for high-rate discharge cells and solid-state battery prototypes.
IC Packaging: Chip-on-Flex (COF) and Tape Automated Bonding (TAB) substrates with fine-line etching requirements (< 20um pitch). 

Width Slitting: Custom slit widths from 10 mm to 1290 mm with a dimensional tolerance of +/- 0.1 mm and burr height < 10% of foil thickness.
Surface Modification: Chemical passivation or adhesion-promoting treatments tailored to PI, PET, or LCP substrate bonding.
Mechanical Tempering: Adjustable tensile strength and elongation profiles (soft, semi-hard, full-hard) matched to downstream stamping or etching. 

Core Material: Suspended on 3-inch or 6-inch high-strength PP or aluminum cores to prevent winding deformation.
Moisture Protection: Vacuum-sealed in anti-static moisture-barrier bags with silica gel desiccant.
Cushioning: Secured inside custom wooden export crates using shock-absorbing foam collars.
Traceability: Each master roll carries a unique barcode label detailing alloy grade, heat number, batch ID, and dimensions. 

In-House Metallurgy: Complete vertical control from raw copper melting to rolling, annealing, and slitting.
Tolerancing Capability: Consistent thickness control of +/- 0.3um across narrow slit widths and wide master coils.
Global Logistics: Export compliance with ISPM 15 wooden packaging and established North American and European freight channels.
Technical Documentation: Full material safety data sheets, RoHS/REACH declarations, and lot-specific test reports supplied with shipments.