High-Conductivity RA Brass Foil

Alloy Composition: Copper-zinc binary and ternary alloys (primarily Cu 65% / Zn 35% C2680 / C2600 equivalents; custom grades available).
Metallurgical Microstructure: Fully recrystallized fine-grain structure via protective-atmosphere annealing, eliminating internal residual stresses and mitigating cracking risks during multi-axis bending.
Chemical Purity: High-purity cathode copper and electrolytic zinc melted in induction furnaces, restricting trace impurities (Pb, Fe, Bi) to below strict mill thresholds to prevent embrittlement. 

Electrical Conductivity: 28% to 38% IACS, minimizing resistive thermal losses in micro-electronic paths.
Formability: High elongation rates (15% to 45% in soft tempers) enable deep drawing and sharp-radius bending without edge tearing or springback.
Mechanical Strength: Tensile strength adjustable from 350 MPa (soft annealed) to 650 MPa (spring hard) based on load and fatigue requirements.
Surface Integrity: Ultra-low surface roughness (Ra <= 0.2 um) free of rolling oils, scale, or pinholes, ensuring reliable plating and bonding. 

Cold Rolling: Multi-high precision reversing mills equipped with automatic gauge control (AGC) to eliminate center-to-edge thickness variations.
Annealing: Bell-type furnaces operating under hydrogen-nitrogen atmospheres to prevent oxidation and ensure uniform grain growth.
Precision Slitting: Shear slitting lines producing burr-free edges (< 10% of foil thickness) to protect downstream stamping dies.
Inspection: 100% inline pinhole detection, laser profiling, and batch tensile testing. Mill Test Certificates (MTC) supplied with every shipment. 

FPC Shielding Films: Dynamic EMI/RFI shielding layers requiring high bending endurance and anti-stress relaxation.
Automotive Connectors: Terminal springs, relay blades, and pin headers demanding persistent contact force and thermal stability.
Precision Electronics: Lead frames, micro-switches, battery contact tabs, and heat sink fins.
Telecommunications: Waveguide components, coaxial cable shielding, and surface-mount grounding clips. 

Inner Protection: Polyethylene film with silica gel packets, suspended inside moisture-proof wooden boxes or plastic drums.
Outer Protection: Fumigation-free wooden crates reinforced with steel strapping (ISPM 15 compliant).
Lead Time: Stock coils ship in 7-10 business days; custom schedules range from 15-25 business days.
Documentation: Certificate of Origin, Commercial Invoice, Packing List, and MTC included. 

Direct Mill Production: Fully integrated manufacturing from raw alloy melting to precision slitting, ensuring total traceability and stable pricing.
Strict Tolerances: Advanced AGC rolling controls reduce thickness deviation, extending stamping tool lifespan.
Metallurgical Support: In-house engineering team for alloy modification, temper optimization, and failure analysis.
Global Standards: ISO 9001, ISO 14001, RoHS, and REACH certified.