Alloy 39，Low Expansion 39 Alloy Foil，Shim，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Foil & Shim** **Precision Thin-Gauge Materials for Advanced Thermal Management Applications** **Alloy 39 Foil and Shim** represent the ultimate refinement in low expansion alloy technology, offering exceptional dimensional stability and controlled thermal expansion in ultra-thin configurations. These precision-engineered materials combine the proven thermal characteristics of Alloy 39 with exacting dimensional control, making them ideal for applications in electronics, aerospace, and precision instrumentation where space constraints and thermal stability are critical. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Purpose | | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 - 40.0 | Primary thermal expansion control | | **Cobalt (Co)** | 14.0 - 16.0 | Secondary expansion adjustment | | **Iron (Fe)** | Balance | Matrix formation | | **Manganese (Mn)** | 0.50 max | Deoxidation control | | **Silicon (Si)** | 0.30 max | Surface quality | | **Carbon (C)** | 0.05 max | Formability | | **Chromium (Cr)** | 0.20 max | Surface stability | | **Aluminum (Al)** | 0.10 max | Deoxidation | | **Copper (Cu)** | 0.20 max | Minor alloying element | * **Ultra-Pure Formulation:** Specially refined chemistry ensures consistent thermal expansion properties in thin gauges while maintaining excellent formability and surface characteristics. --- #### **2. Physical Properties** | Property | Foil Specification | Shim Specification | | :--- | :--- | :--- | | **Density** | 8.17 g/cm³ | 8.17 g/cm³ | | **Melting Point** | 1450°C | 1450°C | | **Thermal Conductivity** | 14.5 W/m·K | 14.5 W/m·K | | **CTE (20-300°C)** | 4.5-5.5 × 10⁻⁶/°C | 4.5-5.5 × 10⁻⁶/°C | | **Electrical Resistivity** | 75 μΩ·cm | 75 μΩ·cm | | **Curie Temperature** | 230°C | 230°C | | **Surface Roughness** | 0.1-0.3 μm Ra | 0.2-0.5 μm Ra | --- #### **3. Mechanical Properties** | Property | Foil (Annealed) | Shim (Hard Temper) | | :--- | :--- | :--- | | **Tensile Strength** | 70-85 ksi (483-586 MPa) | 100-130 ksi (690-896 MPa) | | **Yield Strength** | 40-55 ksi (276-379 MPa) | 90-115 ksi (621-793 MPa) | | **Elongation** | 35-45% | 8-15% | | **Hardness** | HV 140-160 | HV 220-260 | | **Flatness Tolerance** | < 1.5 mm/m | < 1.0 mm/m | --- #### **4. Product Specifications & Applications** **Foil Products (0.001-0.010" / 0.025-0.25 mm):** - **Thickness Range:** 0.001" to 0.010" (0.025-0.25 mm) - **Electronic Shielding:** EMI/RFI shielding applications - **Thermal Management:** Heat spreading substrates - **Medical Devices:** Implantable device components - **Aerospace:** Thin-section thermal barriers **Shim Products (0.010-0.060" / 0.25-1.52 mm):** - **Thickness Range:** 0.010" to 0.060" (0.25-1.52 mm) - **Precision Spacers:** Critical gap maintenance - **Alignment Components:** Optical and mechanical alignment - **Thermal Barriers:** High-temperature insulation - **Structural Support:** Miniature framework elements **Specialized Applications:** - **Semiconductor:** Wafer processing components - **Optics:** Laser system alignment shims - **Medical:** Surgical instrument components - **Research:** Experimental apparatus - **Defense:** Guidance system components --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F30:** Iron-Nickel-Cobalt Alloys - **UNS K94670:** Unified Numbering System - **AMS 7725:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel - **DIN 17470:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Quality Specifications:** - **Thickness Tolerance:** ±0.0001" to ±0.001" - **Width Tolerance:** ±0.002" to ±0.010" - **Surface Quality:** Class A to Class C available - **Flatness Standards:** ASTM A480 compliant - **Certification:** EN 10204 3.1/3.2 with full traceability --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Excellence:** - **Precision Rolling:** State-of-the-art cold rolling technology - **Surface Control:** Advanced polishing and finishing - **Heat Treatment:** Controlled atmosphere annealing - **Quality Verification:** 100% dimensional inspection **Performance Benefits:** - **Exceptional Flatness:** Maintains dimensional stability - **Thermal Stability:** Minimal expansion under temperature variations - **Excellent Formability:** Suitable for complex shaping - **Consistent Quality:** Uniform properties throughout material **Fabrication Guidelines:** - **Stamping:** Suitable for precision stamping operations - **Photochemical Etching:** Complex geometries achievable - **Laser Cutting:** Precision cutting capabilities - **Forming:** Excellent bend characteristics --- #### **Why Choose Our Alloy 39 Foil & Shim Products?** * **Ultra-Precision Manufacturing:** Exceptional thickness control * **Material Consistency:** Guaranteed thermal expansion characteristics * **Technical Expertise:** Comprehensive application support * **Quality Assurance:** Rigorous inspection protocols * **Global Compliance:** Meets international standards * **Proven Performance:** Extensive application experience **Value-Added Services:** - Precision slitting to width - Custom blanking services - Special surface preparations - Heat treatment processing - Protective packaging solutions **Contact our technical team** for detailed specifications and application support. We provide complete solutions for your low expansion alloy requirements, ensuring optimal performance in your most demanding precision applications.

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 2766 gallon liquid totes Special package is available on request.