Alloy 27，Glass sealing 27 Alloy Foil，Shim，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Foil & Shim** **Precision Thin-Gauge Materials for Advanced Glass-to-Metal Sealing Applications** **Alloy 27 Foil and Shim** represent the ultimate refinement in glass-to-metal sealing materials, offering exceptional thin-gauge performance while maintaining the critical thermal expansion characteristics required for reliable hermetic seals. These precision-engineered products combine the proven thermal compatibility of Alloy 27 with the dimensional precision necessary for modern miniaturized electronic, medical, and aerospace applications where space constraints and exacting performance requirements demand superior material solutions. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Importance | | :--- | :--- | :--- | | **Cobalt (Co)** | 26.5 - 27.5 | Critical for thermal expansion match | | **Nickel (Ni)** | 26.5 - 27.5 | Essential for glass wetting characteristics | | **Iron (Fe)** | Balance | Structural integrity foundation | | **Manganese (Mn)** | 0.50 max | Deoxidation control | | **Silicon (Si)** | 0.50 max | Surface quality management | | **Carbon (C)** | 0.15 max | Weldability and formability | | **Chromium (Cr)** | 0.20 max | Surface oxidation resistance | | **Aluminum (Al)** | 0.10 max | Deoxidation element | | **Copper (Cu)** | 0.20 max | Conductivity influence | | **Zirconium (Zr)** | 0.10 max | Grain structure control | * **Ultra-Pure Formulation:** Specially refined to maintain consistent thermal expansion properties in thin gauges while ensuring excellent formability and surface characteristics for precision applications. --- #### **2. Physical Properties** | Property | Foil Specification | Shim Specification | | :--- | :--- | :--- | | **Density** | 8.03 g/cm³ | 8.03 g/cm³ | | **Melting Point** | 1425-1450°C | 1425-1450°C | | **Thermal Conductivity** | 18.1 W/m·K | 18.1 W/m·K | | **CTE (20-400°C)** | 5.3-6.2 × 10⁻⁶/°C | 5.3-6.2 × 10⁻⁶/°C | | **Electrical Resistivity** | 35.0 μΩ·cm | 35.0 μΩ·cm | | **Curie Temperature** | 430°C | 430°C | | **Surface Roughness** | 0.1-0.4 μm Ra | 0.2-0.8 μm Ra | --- #### **3. Mechanical Properties** | Property | Foil (Annealed) | Shim (Hard) | | :--- | :--- | :--- | | **Tensile Strength** | 75-85 ksi (517-586 MPa) | 100-130 ksi (690-896 MPa) | | **Yield Strength** | 45-55 ksi (310-379 MPa) | 90-115 ksi (621-793 MPa) | | **Elongation** | 35-45% | 8-15% | | **Hardness** | HV 140-160 | HV 220-260 | | **Flatness** | < 1 mm/m | < 0.5 mm/m | --- #### **4. Product Specifications & Applications** **Foil Products (0.001-0.010" / 0.025-0.25 mm):** - **Micro-electronic Packaging:** Thin-film substrates and lead frames - **Medical Devices:** Implantable device shields and barriers - **Aerospace:** Thin-section radiation shields and thermal management - **Research:** Experimental sealing applications and prototypes **Shim Products (0.010-0.060" / 0.25-1.52 mm):** - **Precision Spacers:** Critical gap maintenance in sealing assemblies - **Alignment Components:** Optical and mechanical alignment systems - **Thermal Management:** Heat spreading and interface applications - **Structural Support:** Miniature framework and support elements **Specialized Applications:** - **Photolithography Masks:** High-precision patterning substrates - **MEMS Packaging:** Micro-electromechanical system encapsulation - **Laser Systems:** Optical alignment and mounting components - **Vacuum Technology:** Thin-section feedthrough and seal elements --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F15:** Standard Specification for Iron-Nickel-Cobalt Sealing Alloys - **UNS K94610:** Unified Numbering System Designation - **MIL-DTL-23488:** Military Specification for Sealing Alloys - **AMS 7723:** Aerospace Material Specification - **ISO 13123:** Thermal Expansion Characteristics Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Quality Specifications:** - **Dimensional Tolerance:** ±0.0001" to ±0.001" (thickness) - **Width Tolerance:** ±0.002" to ±0.010" - **Surface Quality:** Class A (optical) to Class C (commercial) - **Flatness Standards:** ASTM A480 compliant - **Certification:** EN 10204 3.1/3.2 with full traceability --- #### **6. Processing & Fabrication Advantages** **Manufacturing Excellence:** - **Precision Rolling:** State-of-the-art cold rolling technology - **Surface Control:** Advanced polishing and finishing capabilities - **Heat Treatment:** Controlled atmosphere annealing - **Quality Verification:** 100% dimensional and surface inspection **Fabrication Flexibility:** - **Photochemical Etching:** Complex geometries with tight tolerances - **Precision Blanking:** High-volume component production - **Laser Cutting:** Intricate shapes and patterns - **Forming Operations:** Deep drawing and bending capabilities **Glass Sealing Performance:** - Perfect CTE match with borosilicate glasses (Corning 7052, 7040) - Excellent surface characteristics for reliable glass adhesion - Stable performance through thermal cycling conditions - Consistent behavior in high-volume production environments --- #### **Why Choose Our Alloy 27 Foil & Shim Products?** * **Ultra-Precision Manufacturing:** Exceptional thickness control and surface quality * **Material Consistency:** Guaranteed thermal expansion characteristics * **Technical Expertise:** Comprehensive application support and guidance * **Quality Assurance:** Rigorous inspection and testing protocols * **Global Compliance:** Meets international standards and specifications * **Proven Performance:** Extensive track record in critical applications **Value-Added Services:** - Custom slitting and shearing to exact dimensions - Special surface preparations and treatments - Protective packaging for delicate materials - Just-in-time delivery programs - Technical consultation and application engineering **Contact our thin-gauge specialists** to discuss your specific foil and shim requirements. We provide complete solutions for your most demanding glass-to-metal sealing applications, from material selection through fabrication guidance, ensuring optimal performance in your miniaturized and precision component designs.

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 2753 gallon liquid totes Special package is available on request.