Thin RA Brass Foil

Alloy Designations: C2680 (CuZn33), C2800 (CuZn40), C2600 (Cartridge Brass, CuZn30).
Chemical Composition:
Copper (Cu): 65.0% - 71.0% (alloy dependent)
Zinc (Zn): Remainder
Impurities (Pb, Fe, Cd): <= 0.05%, verified via ICP-OES spectrometry.
Microstructure: Fully recrystallized, uniform equiaxed grain structure ensuring isotropic mechanical behavior. 

Formability: High elongation ratios support micro-bending, deep drawing, and progressive die stamping with minimal spring-back and zero edge cracking.

Electrical Conductivity: Ranges from 22% to 28% IACS (at 20 deg C), maintaining low electrical resistance in micro-electronic current paths.

Surface Integrity: Clean, rolling-oil-free surface with controlled roughness (Ra <= 0.4 um) and zero pinholes or oxide scale inclusion.

Mechanical Strength: Tailored temper conditions (Annealed O, Half-Hard H, Extra-Hard EH, Spring Hard SEH) delivering tensile strengths from 300 MPa to over 700 MPa.

Cold Rolling: Multi-roll reversing mills integrated with Automatic Gauge Control (AGC) and laser sensors, maintaining cross-web thickness variance within +/- 1%.

Intermediate Annealing: Bell-type furnaces utilizing high-purity hydrogen-nitrogen protective atmospheres to eliminate oxidation and control grain size.

Precision Slitting: Rotary shear slitting lines with carbide tooling, restricting edge burr height to <= 5% of foil thickness.

Inspection Protocol: Real-time online X-ray thickness monitoring, universal tensile testing, 100% eddy current defect screening, and batch-wise ICP-OES elemental analysis.

Certifications: Produced under IATF 16949 and ISO 9001 quality protocols.

Dimensions: Slit widths, coil inner diameters (3 inch / 76 mm or 6 inch / 152 mm cores), and outer diameter constraints matched to press uncoiler capacities.
Tempers: Mechanical properties matched to specific stamping die clearance and spring-back requirements.
Surface Passivation: Optional anti-tarnish chemical passivation to prevent oxidation during extended storage. 

Protective Structure: Suspended wooden crates lined with waterproof barriers, enclosing vacuum-sealed heavy-duty polyethylene bags with VCI emitters and silica gel desiccant.
Interleaving: Acid-free tissue paper interleaving applied for foils below 0.05 mm to prevent scratching.
Traceability: Each master coil laser-etched with a unique ID and accompanied by a physical Material Test Report (MTR). 

Vertical Integration: Full in-house control from alloy casting, hot rolling, multi-pass cold reduction, annealing, to precision slitting.
Batch Consistency: Direct mill processing ensuring repeatable mechanical properties and minimal lot-to-lot variance.
Engineering Support: Direct access to metallurgical engineers for alloy selection, prototyping, and technical specification reviews.