Low-Profile RA Brass Foil

Alloy Composition

The current product specification includes C26000, C26800, and C27000 brass alloys, corresponding to CuZn30, CuZn33 and related brass designations listed on the product page. The material contains 65%–70% electrolytic copper and 30%–35% high-purity zinc.

Impurity Control

Lead (Pb), iron (Fe), and bismuth (Bi) are controlled below 0.005% according to the current product information, helping reduce the risk of embrittlement during stamping.

Melting Integrity

Vacuum induction melting is used before hot breakdown rolling to reduce dissolved gases and oxide inclusions.

Microstructural Homogeneity

Raw material screening is used to maintain a uniform grain structure and consistent electrical resistivity across production lots.

Low Surface Profile

The specified surface profile is controlled at Rz ≤ 0.8–1.2 μm, supporting applications where surface condition affects bonding, etching, or electrical contact.

Mechanical Strength

Tensile strength is specified at 350–680 MPa, depending on the material condition and temper.

Formability

The current product information lists elongation from 3% to 35%. Available tempers include O, 1/4H, 1/2H, H, and EH for different forming requirements.

Electrical Conductivity

Electrical conductivity is specified at 22%–28% IACS at 20°C.

Edge Quality

Precision rotary shearing is used to control the strip edge, with burr height specified at less than 5% of material thickness.

Melting & Casting

Vacuum induction melting is used to reduce dissolved gases and oxide inclusions before hot breakdown rolling.

Cold Rolling

20-high Sendzimir mills with automatic gauge control (AGC) are used to control thickness consistency and reduce cross-web thickness variation and camber.

Annealing

Continuous bright-annealing lines operate under hydrogen-nitrogen protective atmospheres to refine the grain structure. The current product information specifies ASTM grain size 7–9.

Slitting & Inspection

Precision slitting and inspection processes include optical real-time edge detection for identifying pinholes and particulate contamination.

Traceability

Master coils carry heat numbers linked to batch-specific Metallurgical Test Reports (MTRs), providing lot-level material traceability.

Flexible Printed Circuits (FPCs)

Used for conductive traces and shielding layers where surface condition, dimensional stability, and bonding performance are important.

EMI/RFI Shielding

Suitable for stamped gaskets and tape backings used in telecommunications and medical electronics.

Precision Connectors

Used for micro-spring contacts requiring stable contact force and fatigue resistance.

Automotive Sensors

Used for lead frames and current-sensing elements in applications rated up to 120°C.

Temper Options

Available tempers include Annealed (O), Quarter-Hard (1/4H), Half-Hard (1/2H), Hard (H), and Spring Temper (EH).

Dimensions

Non-standard gauges and slitting configurations can be engineered for progressive die tooling and other component production requirements.

Surface Treatment

Optional anti-tarnish passivation is available where additional surface protection is required before processing.

Core Specifications

3-inch and 6-inch steel or plastic cores are available, with customized outer diameters according to production requirements.

Protection

Acid-free interleaving paper, VCI anti-corrosion film, and vacuum-sealed aluminum moisture-barrier bags with silica gel are used to protect the foil during storage and transportation.

Crate Design

The coils are suspended in heavy-duty, fumigation-free wooden export boxes with shock-absorbing foam inserts.

Logistics

FOB, CIF, and DDP shipping terms are available through Shanghai and Ningbo ports. The current standard production lead time is 15–25 business days, while sample lots are stated to ship within 48 hours.

Direct Mill Production

Integrated cold rolling and slitting operations provide direct control over key processing stages and production consistency.

Dimensional Control

Thickness tolerances are controlled down to ±0.001 mm according to the current product specification.

Metallurgical Uniformity

Controlled grain structure helps maintain consistent forming and stamping behavior between production lots.

Compliance and Traceability

The current product information references RoHS, REACH, and ISO 9001:2015 compliance, with Material Test Reports (MTRs) available for production lots.