Alloy 27，Glass sealing 27 Alloy Fittings，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Fittings** **Precision Engineered Components for Superior Glass-to-Metal Sealing Systems** **Alloy 27 Fittings** are specialized components manufactured from cobalt-nickel-iron sealing alloy, specifically engineered for creating reliable hermetic connections in glass-to-metal sealing applications. These precision fittings maintain the exceptional thermal expansion characteristics of Alloy 27 while providing ready-to-install solutions for complex sealing systems in electronic, aerospace, and industrial applications where thermal compatibility and sealing integrity are paramount. --- #### **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** composition ensures perfect thermal expansion matching with borosilicate glasses, while the controlled impurity levels guarantee consistent performance and reliable sealing in finished fittings. --- #### **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 Shock Resistance** | Excellent | --- #### **3. Mechanical Properties** | Property | Value Range | | :--- | :--- | | **Tensile Strength** | 75-100 ksi (517-690 MPa) | | **Yield Strength (0.2% Offset)** | 45-80 ksi (310-552 MPa) | | **Elongation** | 25-40% | | **Hardness** | Rb 75-95 | | **Impact Strength** | 40-60 ft-lb (54-81 J) | --- #### **4. Product Specifications & Applications** **Available Fitting Types:** - **Flanges and Headers:** For vacuum systems and electronic packaging - **Connector Bodies:** Hermetic electrical and fiber optic connectors - **Adapter Rings:** Transition pieces for different sealing materials - **Specialized Housings:** Custom enclosures for sensitive components - **Mounting Bases:** Precision platforms for optical and electronic systems **Primary Applications:** * **Electronics & Semiconductor:** - IC package headers and bases - Power device mounting flanges - Vacuum feedthrough components - Microwave tube fittings * **Aerospace & Defense:** - Avionics enclosure fittings - Sensor mounting assemblies - Optical system housings - Military connector components * **Medical Technology:** - Implantable device connectors - Medical instrument housings - Diagnostic equipment fittings - Surgical device components * **Industrial Equipment:** - High-vacuum system flanges - Process control instrument fittings - Analytical equipment components - Specialized sensor housings **Specialized Fitting Applications:** - Glass-to-metal transition assemblies - Hermetic connector systems - Precision optical mounts - Custom vacuum chamber fittings - Laboratory apparatus components --- #### **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 **Fitting Specifications:** - **Dimensional Standards:** ASME B16.5, B16.34 compliant - **Pressure Ratings:** Vacuum to high-pressure applications - **Surface Finish:** 32-125 μin Ra (0.8-3.2 μm) - **Dimensional Tolerance:** ±0.001" to ±0.005" - **Certification:** EN 10204 3.1/3.2 with full traceability --- #### **6. Processing & Fabrication Guidelines** **Manufacturing Processes:** - Precision machining from forged or rolled stock - Investment casting for complex geometries - Powder metallurgy for specialized applications - Complete heat treatment and stress relief **Quality Assurance:** - **Dimensional Inspection:** CMM verification available - **Surface Quality:** Visual and microscopic examination - **Material Verification:** Positive material identification - **Performance Testing:** Leak testing and thermal cycling **Heat Treatment:** - **Solution Annealing:** 850-950°C (1560-1740°F) - **Stress Relieving:** 425-540°C (800-1000°F) - **Atmosphere Control:** Hydrogen or vacuum essential - **Certification:** Full heat treatment documentation **Glass Sealing Performance:** - Perfect thermal expansion match with borosilicate glasses - Compatible with Corning 7052, 7040 series glasses - Optimized surface preparation for reliable bonding - Stable performance under thermal cycling conditions --- #### **Why Choose Our Alloy 27 Fittings?** * **Precision Engineering:** Exceptional dimensional accuracy and surface quality * **Material Consistency:** Guaranteed chemical composition and microstructure * **Proven Reliability:** Extensive track record in critical applications * **Technical Expertise:** Comprehensive engineering support * **Quality Assurance:** Full traceability with certified documentation * **Global Compliance:** Meets international standards and customer specifications **Value-Added Services:** - Custom design and engineering - Complete machining capabilities - Special surface preparations - Performance testing and validation - Technical documentation support **Contact our engineering team** for specific application requirements and technical support. We provide complete solutions for your glass-to-metal sealing fitting needs, from design consultation to manufacturing and quality assurance, ensuring optimal performance in your most demanding 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 2750 gallon liquid totes Special package is available on request.