High-Precision Rolled Annealed Bronze Foil for Electronics & Industrial Applications
Custom-rolled phosphor bronze foil engineered for stable electrical conductivity, high fatigue resistance, and tight dimensional tolerances. Manufactured to exact temper and thickness specifications for stamping, shielding, and current-carrying components.
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High-Precision RA Bronze FoilHigh-Precision RA Bronze Foil is a rolled and annealed copper-tin alloy foil developed for applications that require controlled dimensions, consistent mechanical properties, and reliable...
CIVEN Metal RA bronze foil is a rolled-annealed copper-tin alloy foil developed for applications that require a balance of electrical conductivity, strength, spring performance and formability.
The material range covers different phosphor bronze alloy grades, thicknesses and temper conditions for precision stamping, electrical contacts, shielding components and spring applications. Depending on the required forming process and end-use performance, buyers can select the appropriate alloy, gauge and temper rather than using a single specification for all applications.
CIVEN Metal processes RA bronze foil through controlled cold rolling and annealing, followed by precision slitting and inspection to maintain consistent thickness and surface quality across the supplied coil.
RA Bronze Foil Material Options
RA bronze foil is generally selected when a component needs more mechanical strength and spring performance than pure copper while retaining useful electrical conductivity.
Alloy Grades
CIVEN Metal's RA bronze foil range includes phosphor bronze grades such as C5191 (CuSn6), C5210 (CuSn8) and C51100. Alloy selection can be matched to the required combination of conductivity, strength, formability and spring characteristics.
Copper-Tin Composition
Tin content and alloy grade influence the mechanical and electrical properties of the finished foil. The material can therefore be specified according to the requirements of the stamping, forming or electrical application.
Fine-Grain Structure
Controlled cold rolling and intermediate annealing are used to develop a consistent fine-grain structure and control the material's mechanical behavior during subsequent processing.
Performance Features
High Fatigue Strength
Suitable for components exposed to repeated flexing, vibration and mechanical cycling.
01
Spring Back Control
Supports consistent forming behavior and spring performance during precision stamping.
02
Electrical & Thermal Conductivity
Provides stable electrical conductivity with consistent thermal transfer performance.
03
Corrosion Resistance
Offers resistance to oxidation, stress corrosion and common service environments.
04
Weldability
A clean, controlled surface supports welding and soldering processes used for suitable components.
05
Technical Specifications
| Parameter | Specification |
|---|---|
| Alloy Grades | C5191, C5210, C51100 |
| Thickness | 0.015–0.50 mm |
| Width | 3.0–600 mm |
| Thickness Tolerance | Up to ±0.001 mm, depending on nominal thickness |
| Density | 8.80–8.88 g/cm³ |
| Electrical Conductivity | 12–20% IACS at 20°C, alloy dependent |
Thickness and Slitting Options
The RA bronze foil range covers thin-gauge material for electronic components as well as thicker gauges used for spring and structural electrical parts.
| Range | Thickness | Typical Uses |
|---|---|---|
| Ultra-thin | 0.015–0.05 mm | Miniature connectors, electronic shielding |
| Standard | 0.05–0.30 mm | Spring clips, contacts, busbars |
| Heavy | 0.30–0.50 mm | Structural electrical components, heavy-duty springs |
Precision slitting is available down to 3.0 mm width, with edge camber under 0.5 mm per 1000 mm.
Available temper conditions can be selected according to the required balance between formability, strength and spring performance.
• Annealed (O): Maximum softness and elongation for deep drawing and complex bending.
• 1/4H and 1/2H: A balance between formability and increased spring performance.
• H, EH and SH: Higher strength conditions for resilient electrical contacts, flat springs and other components requiring greater mechanical resistance.
Actual mechanical properties depend on the selected alloy and temper and should be confirmed against the required specification before ordering.
Surface Options
Depending on the product specification, RA bronze foil can be supplied with different surface conditions, including bright, matte and passivated finishes.
Surface requirements can be discussed according to the intended stamping, bonding, coating or electrical application.
Manufacturing & Quality Control
CIVEN Metal controls RA bronze foil production through cold rolling, controlled annealing, precision slitting and final inspection.
Quality checks include thickness measurement, mechanical testing, hardness testing, electrical resistivity testing and surface inspection. Coil-level traceability links production and inspection records with the supplied material.
RA Bronze Foil Applications
Electrical & Electronics
Lead frames, micro-switches, relay springs, socket terminals and battery contact plates.
Telecommunications
Coaxial cable shielding, EMI/EMC components and high-frequency connector parts.
Automotive
ECU springs, sensor components and wiring harness terminals.
Industrial Equipment
Precision washers, bellows, Bourdon tube components and other formed parts requiring spring performance and dimensional stability.
Specification Options
RA Bronze Foil Specification Options
CIVEN Metal can review RA bronze foil requirements based on the application and processing equipment.
Custom Tempers
Mechanical property targets can be discussed for stamping, bending and spring applications.
Coil Dimensions
Inner and outer diameter requirements can be matched to the buyer's decoiler and production equipment.
Surface Protection
Interleaving paper or protective film can be considered for applications with specific surface requirements.
Trial Quantities
Sample or trial production can be discussed before regular production orders.
Packaging & Delivery
Packaging and Delivery
RA bronze foil coils are protected against moisture, oxidation and handling damage during storage and transportation. Export packaging can be adapted to the coil dimensions, surface requirements and shipping method.
Packaging and delivery details can be confirmed with the final material specification and order quantity.
Why CIVEN Metal
Production Control
Rolling, annealing and slitting processes are managed as part of the material production process.
Thickness Control
Precision gauge control supports consistent thickness across the supplied coil.
Material Documentation
Mill Test Certificates can be supplied with shipment documentation according to the agreed specification.
Traceability
Material and inspection records can be linked to the individual production coil for order traceability.
Civen Metal Material (Shanghai) Co., Ltd. is one of the most professional ra bronze foil manufacturers and suppliers in China. With abundant experience, we warmly welcome you to wholesale bulk high quality ra bronze foil made in China here from our factory. Good service and reasonable price are available.
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