Civen Metal Material (Shanghai) Co., Ltd. is one of the leading manufacturers and suppliers of precision ra brass foil for electronics in China. Welcome to buy bulk durable precision ra brass foil for electronics made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
CIVEN Metal produces precision rolled annealed (RA) brass foil for electronic components requiring stable electrical conductivity, tight thickness control, and reliable formability. Processed via multi-stage cold rolling and controlled atmosphere annealing, this foil ensures consistent grain structure and clean surfaces for high-speed stamping and etching.
Key Material & Standards
Alloy Designations: CuZn30 (EN CW505L / ASTM C26000), CuZn37 (EN CW508L / ASTM C27200).
Chemical Composition: Controlled copper content (63.0% - 71.0%) with balanced zinc; impurities strictly limited (Fe <= 0.05%, Pb <= 0.03%).
Microstructure: Uniform equiaxed grain structure designed for deep drawing and multi-axis bending without micro-fissuring.
Technical Specifications
|
Parameter |
Specification Range |
Test Standard |
|
Thickness |
0.02 mm - 0.50 mm |
ISO 6892-1 / ASTM E345 |
|
Width |
10 mm - 600 mm (Slit edges) |
Micrometer / Laser Gauging |
|
Tensile Strength |
300 - 650 MPa (Temper-dependent) |
ASTM E8 / EN 1654 |
|
Elongation |
3% - 50% |
ISO 6892-1 |
|
Electrical Conductivity |
20% - 28% IACS (20°C) |
ASTM E1004 |
|
Surface Roughness (Ra) |
<= 0.4 um |
Stylus Profilometer |
|
Coil Inner Diameter (ID) |
100 mm, 150 mm, 300 mm |
- |
Manufacturing & Quality Control
Rolling Mills: 4-high and 20-high reversible cold rolling mills integrated with automatic gauge control (AGC).
Annealing: Continuous bell-type furnaces operating under a hydrogen-nitrogen protective atmosphere.
Slitting: Rotary tungsten carbide slitting lines maintaining burr heights <= 5% of foil thickness and camber <= 1.0 mm per 2000 mm.
Inspection & Compliance: 100% online pinhole and thickness scanning, destructive tensile testing, and optical grain size verification. ISO 9001, ISO 14001, and IATF 16949 certified.
Applications
EMI/RFI Shielding: Grounding layers and conductive wraps in telecommunication devices.
Connector Springs & Terminals: Stamped contact pins, socket clips, and battery spring contacts.
Lead Frames: Substrates for discrete semiconductor packages and integrated circuits.
Flexible Flat Cables (FFC): Conductive traces requiring high flex life.
Transformer Windings: Current-carrying layers in miniature high-frequency transformers.
Customization & Supply Terms
Customization: Tailored thickness, slit widths, temper states (O, 1/4H, 1/2H, H, EH), and anti-tarnish chemical passivation.
Documentation: Full Material Test Reports (MTR) and Certificates of Analysis (CoA) provided per lot, detailing chemistry, tensile data, and dimensions.
Packaging: Moisture-barrier inner film, desiccant, suspension wooden boxes, and horizontal eye-to-sky palletization equipped with edge protectors.
Lead Times & MOQ: Standard production takes 15 to 25 business days. MOQ is 300 kg per specification, with trial quantities available for prototyping.
Why CIVEN Metal
In-House Control: Complete vertical processing from cold rolling to precision slitting.
Process Capability: Statistical Process Control (SPC) maintained at Cpk >= 1.33 across critical dimensions.
Engineering Support: Direct collaboration for alloy matching and qualification sample runs.
FAQ
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