Alloy 27，Glass sealing 27 Alloy Wire，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Wire** **Precision-Drawn Wire for Critical Glass-to-Metal Sealing Applications** **Alloy 27 Wire** is a premium cobalt-nickel-iron alloy wire specifically engineered for glass-to-metal sealing applications requiring precise dimensions, superior surface quality, and consistent thermal expansion characteristics. This precision-drawn wire maintains the exceptional thermal compatibility of Alloy 27 with various sealing glasses while offering excellent formability and mechanical properties for high-volume manufacturing of electronic components, medical devices, and aerospace systems. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Purpose | | :--- | :--- | :--- | | **Cobalt (Co)** | 26.5 - 27.5 | Thermal expansion control | | **Nickel (Ni)** | 26.5 - 27.5 | Glass wetting enhancement | | **Iron (Fe)** | Balance | Matrix formation | | **Manganese (Mn)** | 0.50 max | Deoxidation | | **Silicon (Si)** | 0.50 max | Surface quality | | **Carbon (C)** | 0.15 max | Formability | | **Chromium (Cr)** | 0.20 max | Oxidation resistance | | **Aluminum (Al)** | 0.10 max | Deoxidation | | **Copper (Cu)** | 0.20 max | Conductivity | | **Sulfur (S)** | 0.015 max | Hot workability | * **Precision Chemistry:** The exact 27% cobalt and nickel balance ensures perfect thermal expansion matching with borosilicate glasses, while tight impurity control guarantees consistent drawing characteristics and surface quality. --- #### **2. Physical Properties** | Property | Value | Condition | | :--- | :--- | :--- | | **Density** | 8.03 g/cm³ | 20°C | | **Melting Point** | 1425-1450°C | - | | **Thermal Conductivity** | 18.1 W/m·K | 20°C | | **CTE (20-400°C)** | 5.3-6.2 × 10⁻⁶/°C | - | | **Electrical Resistivity** | 35.0 μΩ·cm | 20°C | | **Curie Temperature** | 430°C | - | | **Specific Heat** | 440 J/kg·K | 20°C | --- #### **3. Mechanical Properties** | Property | Annealed | Hard Drawn | | :--- | :--- | :--- | | **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% | | **Reduction of Area** | 60-70% | 40-50% | | **Hardness** | HV 140-160 | HV 220-260 | --- #### **4. Product Specifications & Applications** **Wire Product Range:** - **Diameter Range:** 0.005" to 0.250" (0.127 mm to 6.35 mm) - **Tolerance:** ±0.0001" to ±0.001" (diameter dependent) - **Spool Sizes:** 5 lb to 50 lb (2.3 kg to 22.7 kg) standard - **Surface Finish:** Bright, cleaned, or specially coated **Primary Applications:** * **Electronic Components:** - IC lead frames and connector pins - Hybrid circuit bonding wires - Semiconductor package leads - Microwave tube components * **Medical Devices:** - Implantable device leads - Surgical instrument components - Diagnostic equipment wiring - Medical sensor elements * **Aerospace & Defense:** - Hermetic connector pins - Sensor lead wires - Avionics component leads - Military electronics packaging * **Industrial Applications:** - Precision spring components - Welding electrode cores - Specialized fastener stock - Custom formed wire parts **Specialized Applications:** - Glass-sealed feedthrough pins - Precision spring contacts - Optical alignment wires - Vacuum tube components - Miniature connector elements --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F15:** Iron-Nickel-Cobalt Sealing Alloys - **UNS K94610:** Unified Numbering System - **MIL-DTL-23488:** Military Specification - **AMS 7723:** Aerospace Material Specification - **ISO 13123:** Thermal Expansion Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Quality Specifications:** - **Diameter Tolerance:** ±0.0001" to ±0.001" - **Surface Quality:** Free of seams, cracks, and inclusions - **Spooling:** Uniform winding without kinks or tangles - **Certification:** EN 10204 3.1/3.2 with full traceability --- #### **6. Processing & Performance Characteristics** **Manufacturing Excellence:** - **Precision Drawing:** Multi-stage cold drawing process - **Heat Treatment:** Controlled atmosphere annealing - **Surface Preparation:** Advanced cleaning and finishing - **Quality Control:** 100% dimensional verification **Fabrication Advantages:** - **Excellent Formability:** Suitable for complex bending and forming - **Consistent Properties:** Uniform mechanical characteristics - **Superior Surface:** Optimal for glass wetting and adhesion - **Reliable Performance:** Proven in high-volume production **Glass Sealing Performance:** - Perfect CTE match with borosilicate glasses (Corning 7052, 7040) - Excellent glass wetting and adhesion characteristics - Stable performance through thermal cycling - Consistent behavior in automated sealing processes **Quality Assurance Testing:** - **Dimensional Verification:** Laser micrometer inspection - **Surface Quality:** Microscopic examination - **Mechanical Testing:** Tensile and elongation verification - **Chemical Analysis:** Spectroscopic verification - **Performance Testing:** Glass sealing trials available --- #### **Why Choose Our Alloy 27 Wire?** * **Precision Manufacturing:** Exceptional diameter control and surface quality * **Material Consistency:** Guaranteed thermal expansion characteristics * **Technical Expertise:** Comprehensive application support * **Quality Assurance:** Rigorous testing and certification * **Global Compliance:** Meets international standards * **Proven Reliability:** Extensive track record in critical applications **Value-Added Services:** - Custom spooling and packaging - Special surface treatments - Precision cutting to length - Technical consultation - Just-in-time delivery **Contact our wire specialists** to discuss your specific application requirements. We provide complete solutions for your glass-to-metal sealing wire needs, from material selection through processing guidance, ensuring optimal performance in your most demanding electronic, medical, and aerospace 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 2754 gallon liquid totes Special package is available on request.