Alloy 404,Monel 404 Foil,Shim,,E FORU

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 404 / Monel® 404 Foil & Shim Stock** **Ultra-Thin, Low-Permeability Nickel-Copper Alloy for Precision Sealing and Spacing** --- #### **Overview** Alloy 404 (Monel 404) Foil and Shim Stock is a precision-engineered, thin-gauge form of the proprietary nickel-copper alloy known for its exceptionally low and stable magnetic permeability. This product is specifically manufactured to meet the demanding requirements of the electronics, aerospace, and high-precision engineering industries, where minimal thickness, controlled magnetic properties, and reliable performance in critical environments are paramount. Available in very thin foils and shims with tightly controlled tolerances, this material is the ideal choice for applications involving hermetic sealing, precise spacing, and magnetic field shielding. --- #### **Key Features & Advantages** * **Controlled Low Magnetic Permeability:** Maintains a permeability of **< 1.005**, making it essentially non-magnetic. This is critical for sensitive electronic devices where magnetic interference must be avoided. * **Available in Ultra-Thin Gauges:** Typically supplied from 0.025 mm (0.001") up to 0.25 mm (0.010") as foil, and slightly thicker for shim stock. * **Excellent Formability and Ductility:** The annealed temper allows for easy punching, stamping, and forming into complex shapes for custom gaskets, seals, and shims. * **Superior Brazing Characteristics:** Its low iron and cobalt content prevents embrittlement during high-temperature brazing in hydrogen atmospheres, making it perfect for metal-to-ceramic or metal-to-glass seals. * **Good Corrosion Resistance:** Resists corrosion from the atmosphere, fresh water, and steam, ensuring long-term reliability. * **High Strength and Durability:** Offers better strength and wear resistance than pure aluminum or copper foils used for similar purposes. --- #### **Chemical Composition (Weight % - Typical)** The composition is meticulously controlled to ensure consistent magnetic and physical properties in thin sections. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 52.0 - 57.0 | | **Copper (Cu)** | Balance | | **Manganese (Mn)** | 0.10 max | | **Iron (Fe)** | 0.25 max | | **Silicon (Si)** | 0.10 max | | **Carbon (C)** | 0.15 max | | **Sulfur (S)** | 0.024 max | | **Cobalt (Co)** | 0.10 max | | **Magnesium (Mg)** | 0.05 - 0.15 | *The critically low levels of Iron (Fe) and Cobalt (Co) are the key to the alloy's stable non-magnetic behavior.* --- #### **Physical & Mechanical Properties** | Property | Value / Condition (Typical for Annealed Foil) | | :--- | :--- | | **Density** | 8.91 g/cm³ (0.322 lb/in³) | | **Melting Point** | 1300 - 1350 °C (2370 - 2460 °F) | | **Electrical Resistivity** | ~29 μΩ·cm at 20°C | | **Thermal Conductivity** | ~29 W/m·K at 20°C | | **Tensile Strength** | 380 - 480 MPa (55 - 70 ksi) | | **Yield Strength (0.2% Offset)** | 140 - 240 MPa (20 - 35 ksi) | | **Elongation** | 35 - 45% | | **Magnetic Permeability** | **< 1.005** | --- #### **Standard Forms & Available Tempers** * **Form:** Foil, Shim Stock, Precision Strip. * **Thickness (Foil):** 0.025 mm (0.001") to 0.25 mm (0.010"). * **Thickness (Shim):** 0.05 mm (0.002") to 1.0 mm (0.040"). * **Width:** Slit to custom widths, typically from 1 mm (0.040") upwards. * **Temper:** * **Annealed (Soft):** Maximizes ductility and formability for complex stamping. * **Hard Rolled:** For applications requiring higher spring-back and strength. --- #### **International Standards** While specific standards for foil may be proprietary, the alloy composition and base material conform to: * **ASTM F96:** Standard Specification for Electronic Grade Alloys (Covers sheet, strip, and foil). * **UNS (Unified Numbering System):** **N04404** * **AMS 4571:** Covers general material properties for bar and forging, often referenced for chemistry. * **Customer-Specific Specifications:** Foil and shim products are often produced to detailed customer drawings and material specifications. --- #### **Product Applications** Alloy 404 Foil and Shim Stock is specified for high-reliability applications where performance is critical. * **Hermetic Sealing Gaskets:** Used in aerospace and military electronics to create seals that maintain a vacuum or specific atmosphere inside a container. * **Thermal Management Shims:** Placed between components to manage heat transfer and compensate for thermal expansion differences. * **Precision Spacers & Shims:** For critical alignment in optical instruments, avionics, and precision rotating equipment. * **RF (Radio Frequency) Shields:** As a thin, non-magnetic shield in sensitive communication devices. * **Electron Tube Components:** Internal components like anodes and shields where any magnetism would distort the electron beam. * **Brazing Preforms:** Pre-cut into precise shapes (washers, rings) to be used as a filler metal in automated brazing processes for joining components. --- #### **Why Choose Alloy 404 Over Other Materials?** * **vs. Pure Nickel Foil:** Alloy 404 offers a more stable low permeability and is often more cost-effective. * **vs. Aluminum or Copper Foil:** Provides significantly higher strength, better corrosion resistance, and superior performance in high-temperature brazing applications. * **vs. Monel 400 Foil:** The key advantage is the guaranteed low magnetic permeability, which is not a feature of the standard Monel 400 alloy. --- **Disclaimer:** *Monel® is a registered trademark of Special Metals Corporation (a PCC company).* This data is provided for informational purposes only and represents typical values. The suitability of the material for a specific application must be determined by the user. Always consult with technical experts for critical 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 2948 gallon liquid totes Special package is available on request.