Alloy 260， Foil，Shim，UNS N03260,E FORU

British Specs:，American Specs: AMS 5890 Bar and Forgings，German Specs:

### **Technical Datasheet: Alloy 260 (Cartridge Brass) Foil & Shim Stock** **UNS Designation:** UNS C26000 | **EN Designation:** CW508L --- ### **1. Product Overview** Alloy 260 foil and shim stock represent the ultra-thin gauge forms of 70/30 brass, engineered for precision applications requiring exceptional formability, electrical conductivity, and dimensional accuracy. Available in thicknesses from 0.025 mm to 0.15 mm, these products combine the alloy's inherent ductility with precise rolling technology to deliver consistent performance in electronic, automotive, and precision engineering applications. --- ### **2. Key Characteristics** - **Ultra-Thin Gauge Capability:** Available down to 0.025 mm (0.001") - **Excellent Surface Finish:** RMS values as low as 0.10 μm for critical applications - **Superior Formability:** Can be stamped, blanked, and formed without cracking - **Good Electrical Conductivity:** 28% IACS for electronic applications - **Precision Thickness Control:** ±0.002 mm tolerance capability - **Temper Variety:** Available from dead soft annealed to full hard tempers --- ### **3. Chemical Composition (Weight %)** | Element | Content | Specification Reference | |---------|---------|------------------------| | Copper (Cu) | 68.5–71.5% | ASTM B36, EN 1652 | | Zinc (Zn) | Remainder | - | | Iron (Fe) | ≤0.05% | - | | Lead (Pb) | ≤0.07% | - | | Other Elements | ≤0.15% total | - | --- ### **4. Physical Properties** - **Density:** 8.53 g/cm³ - **Thermal Conductivity:** 120 W/m·K - **Electrical Conductivity:** 28% IACS - **Coefficient of Thermal Expansion:** 20.2 × 10⁻⁶/°C - **Melting Range:** 915–955°C - **Temperatures:** - Annealing: 425–600°C - Stress Relieving: 200–300°C --- ### **5. Mechanical Properties by Temper** | Temper | Thickness Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |--------|---------------------|-----------------------|---------------------|----------------| | O61 (Annealed) | 0.025–0.15 | 325–380 | 75–125 | 45–60 | | H01 (1/4 Hard) | 0.025–0.15 | 380–450 | 125–240 | 35–50 | | H02 (1/2 Hard) | 0.025–0.15 | 415–485 | 205–330 | 20–40 | | H04 (Hard) | 0.025–0.15 | 485–565 | 395–485 | 5–15 | --- ### **6. International Standards** #### **6.1. Primary Specifications** - **ASTM B36:** Brass Plate, Sheet, Strip, and Rolled Bar - **EN 1652:** Copper and copper alloys - Plate, sheet, strip and circles - **DIN 17660:** CuZn30 (CZ106) - **JIS H3100:** Copper and copper alloy sheets, plates and strips #### **6.2. Specialized Standards** - **ASTM B569:** Narrow Strip for Electrical Applications - **EN 12166:** Copper and copper alloys - Wire for general purposes - **ISO 426-3:** Wrought copper-zinc alloys - Strip --- ### **7. Product Applications** #### **7.1. Electronic & Electrical** - **RFI/EMI Shielding:** Flexible gaskets and enclosures - **Flexible Circuits:** Carrier material for printed electronics - **Battery Components:** Current collectors and terminals - **Waveguide Components:** Precision-formed microwave guides #### **7.2. Precision Engineering** - **Shim Stock:** Precision spacing and alignment applications - **Thermal Management:** Heat spreaders and thermal interfaces - **Gaskets & Seals:** Form-in-place gaskets for automotive and aerospace - **Vibration Damping:** Constrained layer damping composites #### **7.3. Decorative & Specialty** - **Inlay Materials:** Decorative surfaces and artistic applications - **Nameplates & Badges:** Thin, formable identification tags - **Craft & Jewelry:** Metal clay substrate and decorative elements --- ### **8. Fabrication Characteristics** #### **8.1. Forming & Stamping** - **Minimum Bend Radius:** 0.5T (Annealed) to 2T (Hard temper) - **Blankability:** Excellent for intricate stampings - **Springback:** Moderate, predictable in hard tempers #### **8.2. Joining Methods** - **Soldering:** Excellent with conventional tin-lead and lead-free solders - **Brazing:** Suitable with silver-based brazing alloys - **Adhesive Bonding:** Good with epoxy and acrylic adhesives - **Welding:** Possible with laser and TIG methods (specialized) --- ### **9. Quality Assurance** - **Dimensional Tolerance:** ±0.002 mm thickness control - **Surface Quality:** Matte, bright, or polished finishes available - **Flatness:** Controlled to prevent camber and waviness - **Cleanliness:** Oil-free and annealed finishes for critical applications --- ### **10. Packaging & Handling** - **Standard Widths:** 10–300 mm - **Core Sizes:** 76 mm and 152 mm inner diameter - **Protection:** Interleaved with tissue or polyethylene coating - **Storage:** Dry, temperature-controlled environments recommended --- ### **11. Advantages Over Competing Materials** | Material | Key Advantage of Alloy 260 | |----------|----------------------------| | Copper C11000 | Better spring properties, lower cost | | Aluminum 1100 | Higher strength, better solderability | | Stainless Steel 304 | Superior formability, electrical conductivity | | Phosphor Bronze C51000 | Better ductility, lower cost | --- ### **12. Disclaimer** This technical data is provided for reference purposes. Actual properties may vary based on manufacturing processes, thickness, and temper. Users should conduct application-specific testing to verify suitability. The manufacturer's recommendations for fabrication and handling should always be followed. Compliance with relevant safety standards and regulations is the responsibility of the end user.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2818 gallon liquid totes Special package is available on request.