Anti-Oxidation Treated RA Copper Foil

Base Material: Cu-ETP (Electrolytic Tough Pitch) or Cu-DHP copper with a purity >= 99.90%.
Microstructure: Fully recrystallized equiaxed grain structure oriented along the rolling direction for fatigue resistance under cyclic bending.
Surface Treatment: Passivated chromium-zinc or organic-inorganic hybrid barrier coating (<= 15nm).
Substrate Compatibility: Direct lamination with polyimide (PI), polyethylene terephthalate (PET), and liquid crystal polymer (LCP) films using acrylic, epoxy, or modified silicone adhesives. 

Thermal Oxidation Resistance: Withstands 180°C for 120 minutes in atmospheric conditions without discoloration, scaling, or contact resistance increase.

Dynamic Flexural Endurance: Survives over 150,000 MIT folding cycles at a 0.8mm bend radius before fatigue fracturing.

Peel Strength Stability: Maintains initial peel strength >= 0.8 N/mm on standard PI films after 72 hours at 85°C and 85% relative humidity prior to etching.

Etching Uniformity: Controlled grain boundary distribution ensures clean, undercut-free line edge definitions down to 20um line/space (L/S) geometries using alkaline cupric chloride or ferric chloride etchants.

Electrical Conductivity: Bulk electrical resistivity below 1.724 x 10^-8 Ohm*m (100% IACS) at 20°C.

Quality Management: Produced under ISO 9001:2015 and IATF 16949 certified quality systems.

Cold Rolling: Multi-stage Z-mill passes reduce high-purity copper cathodes to target gauge with controlled dimensional reduction per pass.

Controlled Atmosphere Annealing: Continuous strand annealing in a hydrogen-nitrogen protective furnace to relieve stress and control grain size.

Surface Passivation: Inline electrochemical or chemical treatment depositing the uniform anti-oxidation molecular layer.

Slitting & Edge Trimming: Precision rotary shear slitting eliminating burrs and edge waviness.

Inspection Protocols:

Pinhole Detection: Continuous optical scanning across the entire master coil length.

Mechanical Testing: Tensile and elongation verification on outer and inner turns of every master roll.

Traceability: Laser-etched lot IDs on every master roll linked to raw material Mill Test Certificates (MTC).

Flexible Printed Circuit Boards (FPCs): Smartphone hinges, camera modules, and foldable OLED display interconnects.

Automotive Sensor Harnesses: Under-hood transmission control units and steering wheel clock spring circuits.

5G Telecommunication Modules: High-frequency antenna substrates requiring minimized insertion loss at conductor edges.

Lithium-Ion Battery Current Collectors: Tab welding and internal current collection foils requiring shelf-life stability prior to active material coating.

Dimensions: Custom slit widths from 20mm to 620mm, wound on 3-inch or 6-inch cores with specified outer diameters.

Surface Treatment: Adjustable passivation film thickness tailored to specific downstream adhesive chemistries.

Mechanical Tempers: Customizable tensile and elongation profiles (Soft, Half-Hard, Full-Hard) matched to stamping, bending, or etching lines.

Packaging: Vacuum-sealed anti-static nitrogen-purged configurations.

Inner Packaging: Suspended within moisture-barrier aluminum foil bags containing silica gel desiccant under a nitrogen atmosphere.

Cushioning: Suspended wooden crates with heavy-duty foam inserts to eliminate core crushing and edge damage.

Documentation: Includes Material Safety Data Sheets (MSDS), Certificate of Analysis (CoA), and RoHS/REACH compliance reports.

Vertical Integration: In-house control over rolling, annealing, passivation, and precision slitting ensuring batch-to-batch consistency.

Controlled Metallurgy: Direct sourcing of high-purity cathode copper to eliminate microscopic inclusions that disrupt chemical etching.

Process Stability: Automated inline monitoring of anti-oxidation layer thickness to prevent lamination delamination.

Global Logistics: Export supply chain infrastructure serving circuit board manufacturers across North America, Europe, and Asia.