Alloy 27，Glass sealing 27 Alloy Sheet，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Sheet** **Precision Thin Sheet for Advanced Glass-to-Metal Sealing Applications** **Alloy 27 Sheet** is a specialized cobalt-nickel-iron alloy in thin sheet form, specifically engineered for high-reliability glass-to-metal sealing applications requiring precise thickness control and superior surface quality. This controlled expansion alloy sheet provides exceptional thermal compatibility with various sealing glasses, making it ideal for electronic enclosures, semiconductor components, medical devices, and aerospace applications where thin-section hermetic sealing and dimensional stability are critical requirements. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | | :--- | :--- | | **Cobalt (Co)** | 26.5 - 27.5 | | **Nickel (Ni)** | 26.5 - 27.5 | | **Iron (Fe)** | Balance | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Carbon (C)** | 0.15 max | | **Chromium (Cr)** | 0.20 max | | **Aluminum (Al)** | 0.10 max | | **Copper (Cu)** | 0.20 max | | **Zirconium (Zr)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | * **Optimized Sealing Chemistry:** The precise 27% **Cobalt** and 27% **Nickel** balance ensures perfect thermal expansion matching with borosilicate glasses, while maintaining excellent formability and sealing characteristics in thin sheet applications. --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 0.290 lb/in³ (8.03 g/cm³) | | **Melting Point** | 1425-1450°C (2600-2640°F) | | **Specific Heat** | 0.105 Btu/lb-°F (440 J/kg-°K) | | **Thermal Conductivity** | 10.5 Btu-ft/hr-ft²-°F (18.1 W/m·K) | | **Mean Coefficient of Thermal Expansion** | 5.3-6.2 x 10⁻⁶/°C (20-400°C) | | **Modulus of Elasticity** | 20 x 10⁶ psi (138 GPa) | | **Electrical Resistivity** | 35.0 μΩ·cm at 20°C | | **Curie Temperature** | 430°C (806°F) | | **Thermal Cycling Performance** | Excellent | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Hard Temper Condition | | :--- | :--- | :--- | | **Tensile Strength** | 75-95 ksi (517-655 MPa) | 100-130 ksi (690-896 MPa) | | **Yield Strength (0.2% Offset)** | 45-65 ksi (310-448 MPa) | 85-110 ksi (586-758 MPa) | | **Elongation** | 30-40% | 8-15% | | **Hardness** | Rb 75-85 | Rb 95-105 | | **Springback Characteristics** | Minimal | Controlled | --- #### **4. Product Specifications & Applications** **Sheet Specifications:** - **Thickness Range:** 0.002" to 0.125" (0.05mm to 3.18mm) - **Width Range:** 6" to 36" (152mm to 914mm) - **Length Range:** 12" to 96" (305mm to 2438mm) - **Surface Finish:** Bright annealed, 2B, BA, or custom finishes - **Flatness:** Commercial or precision grades available **Primary Applications:** * **Electronics & Semiconductor:** - IC package lids and covers - Hybrid circuit substrates - Power device enclosures - RF microwave packages * **Medical Technology:** - Implantable device housings - Medical sensor diaphragms - Surgical instrument components - Diagnostic equipment shields * **Aerospace & Defense:** - Avionics enclosures - Sensor protective covers - Optical device housings - Military electronics packaging * **Consumer Electronics:** - High-reliability connector components - Sensor packaging - Specialized enclosure applications **Specialized Sheet Applications:** - Thin-profile hermetic seals - Glass viewing window frames - Precision stamped components - Multi-layer sealing assemblies - Custom electronic packages --- #### **5. International Standards & Specifications** **Material Standards:** - **ASTM F15:** Standard Specification for Iron-Nickel-Cobalt Sealing Alloys - **UNS K94610:** Unified Numbering System - **MIL-DTL-23488:** Military Specification - **AMS 7723:** Aerospace Material Specification - **ISO 13123:** Thermal Expansion Characteristics Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Sheet Specifications:** - **Thickness Tolerance:** ±0.0001" to ±0.005" (depending on thickness) - **Flatness Standards:** ASTM A480 compliant - **Surface Quality:** No. 1 finish standard, special finishes available - **Dimensional Stability:** Controlled through thermal processing - **Certification:** EN 10204 3.1/3.2 material certificates --- #### **6. Processing & Fabrication Guidelines** **Forming Characteristics:** - Excellent deep drawing capability in annealed condition - Good bend characteristics with proper tooling - Minimal springback in annealed temper - Suitable for high-speed stamping operations **Fabrication Processes:** - **Blank and Pierce:** Clean edge quality maintainable - **Deep Drawing:** Multiple draw operations possible - **Bending and Forming:** Sharp radii achievable - **Surface Treatment:** Various finishing options available **Heat Treatment:** - **Solution Annealing:** 850-950°C (1560-1740°F) - **Stress Relieving:** 425-540°C (800-1000°F) - **Atmosphere Requirements:** Hydrogen or vacuum essential - **Temperature Uniformity:** Critical for flatness control **Glass Sealing Performance:** - Perfect thermal expansion match with borosilicate glasses - Compatible with Corning 7052, 7040, and similar glass types - Excellent for thin-section sealing applications - Stable performance under repeated thermal cycling --- #### **Why Choose Our Alloy 27 Sheet?** * **Premium Quality Control:** Strict chemical composition and microstructure management * **Precision Thickness Control:** Exceptional gauge uniformity throughout coils/sheets * **Superior Surface Quality:** Optimized for glass sealing applications * **Technical Expertise:** Comprehensive support for stamping and forming processes * **Quality Assurance:** Full material traceability with certified test reports * **Global Standards Compliance:** Meets international specifications and customer requirements **Value-Added Services:** - Precision slitting to width - Custom blanking services - Surface finishing treatments - Heat treatment processing - Comprehensive testing and certification **Contact our technical team** for specific application requirements and engineering support. We provide complete solutions for your glass-to-metal sealing sheet applications, from material selection to fabrication guidance and quality assurance. Our expertise ensures your thin-section sealing applications achieve optimal performance and reliability.

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 2748 gallon liquid totes Special package is available on request.