70μm Standard RA Copper Foil

Base Alloy: Electrolytic Tough Pitch (ETP) Copper (C11000 / Cu-ETP) or Oxygen-Free Electronic (OFE) Copper (C10200 / Cu-OF).
Purity: >= 99.90% (ETP) or >= 99.99% (OFE).
Microstructure: Recrystallized grain orientation engineered for ductility and uniform elongation.
Surface State: Oxide-free matte/shiny finishes with optional anti-tarnish passivation. 

High Elongation: Withstands dynamic bending cycles without micro-cracking.
Uniform Gauge: Controlled roll gap tolerances across coil widths ensure consistent electrical resistance and etching rates.
Low Roughness: Minimizes skin-effect signal loss in high-frequency transmission.
Thermal Endurance: Maintains structural stability during soldering and reflow processes up to 300°C.
Solid Matrix: Mechanical compaction prevents void defects found in thinner cast or electro-deposited foils. 

Rolling Infrastructure: Multi-roll reversible Sendzimir and precision 4-high mills maintain gauge control under hydraulic tension.
Controlled Annealing: Continuous strand furnaces operate under a reducing nitrogen-hydrogen atmosphere to prevent surface oxidation.
Inline Inspection: Automated optical systems detect pinholes, edge cracks, and surface scratches in real time.
Laboratory Verification: Destructive tensile testing, elongation measurement, atomic absorption spectrometry, and resistivity profiling performed per lot.
Certifications: Produced under ISO 9001 and IATF 16949 quality management systems with full lot traceability from raw ingot to finished coil. 

Flexible Printed Circuits (FPCs): Dynamic flex layers in consumer electronics and automotive harnesses.
Transformers & Inductors: Foil windings for switch-mode power supplies and low-profile magnetic components.
Electromagnetic Shielding: EMI/RFI shielding layers for aerospace and telecommunications.
Battery Technology: Current collectors and thermal shunts in lithium-ion cell architectures. 

Slitting: Rotary shear slitting down to 5 mm widths with burr-free edges; master roll lengths up to 3000 m.
Treatments: Mechanical brushing, chemical cleaning, or passivation applied per processing requirements.
Core Selection: Plastic or steel cores (76 mm or 152 mm) matched to uncoiling equipment.
Sampling: A4 sheets and 10 meter trial slit rolls available for evaluation. 

Moisture Barrier: Vacuum-sealed in anti-static poly bags with desiccant silica gel.
Crating: Vertical or horizontal suspension in fumigated wooden crates utilizing edge protectors and shock-absorbing foam.
Traceability Labels: Marked with melt number, coil ID, net/gross weight, dimensions, and production date.
Logistics: FOB, CIF, and DDP terms via air or containerized ocean freight. 

Advanced Rolling Precision: Multi-stage cold rolling infrastructure achieves tighter thickness tolerances than commercial standards.
In-House Metallurgy Lab: Direct testing capability eliminates reliance on third-party labs and ensures lot-to-lot verification.
Rigorous Compliance: Full adherence to ISO 9001 and IATF 16949 for strict process control.
Global Supply Chain: Established export routes serving tier-one manufacturers across North America, Europe, and Asia.
Engineering Collaboration: Direct access to materials specialists for alloy selection and thickness optimization.