📄 Product Description: Nilo 42 / 42Н / Alloy 42 — Controlled Expansion Nickel-Iron Alloy
🧾 General Technical Characteristics
Nilo 42 (also known as Alloy 42 or 42Н) is a nickel-iron alloy containing approximately 42% nickel and 58% iron. It is known for its low and consistent coefficient of thermal expansion (CTE), which makes it ideal for glass-to-metal and ceramic-to-metal sealing applications. The alloy is also valued for its dimensional stability across a broad temperature range.
Nilo 42 is available in a wide variety of forms: strips, wires, sheets, bars, and custom shapes with tight tolerances.
⚙️ Applications
- Glass-to-metal and ceramic-to-metal hermetic seals
- Semiconductor packaging
- Vacuum tubes and cathode ray tubes
- Lead frames in integrated circuits (ICs)
- Electronic components that require thermal compatibility with glass or ceramics
📈 Key Advantages
- ✅ Low and stable CTE matched to hard and soft glass (approx. 5.5–6.5 × 10⁻⁶/°C)
- ✅ Excellent weldability and brazing characteristics
- ✅ High dimensional stability and flatness
- ✅ Available in ultra-thin strips and precision forms
- ✅ Alternative to Kovar in specific electronic applications
🧪 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 41.0–43.0 |
| Iron (Fe) | Balance |
| Manganese (Mn) | ≤ 0.80 |
| Silicon (Si) | ≤ 0.30 |
| Carbon (C) | ≤ 0.05 |
| Sulfur (S) | ≤ 0.02 |
| Phosphorus (P) | ≤ 0.02 |
🧩 Mechanical and Physical Properties
- Tensile Strength (annealed): 450–650 MPa
- Yield Strength: ≥ 275 MPa
- Elongation (A5): ≥ 30 %
- Hardness: ~130–180 HV (depending on treatment)
- CTE (20–300 °C): ~5.5–6.5 × 10⁻⁶ /°C
- Density: 8.12 g/cm³
- Electrical Resistivity: ~0.6 μΩ·m
- Thermal Conductivity: ~13 W/m·K
✅ Conclusion
Nilo 42 / Alloy 42 / 42Н is a premium nickel-iron alloy widely used in electronics, optics, and aerospace for its stable thermal behavior and compatibility with glass and ceramics. Its precise expansion control makes it an excellent solution for hermetic seals and electronic packaging components.
Available in coils, sheets, wires, and machined forms — with optional heat treatment and surface finishing upon request.
Contact us for technical consultation, datasheets, or to request a quote!
Delivery Forms Alloy 42
| Alloy 42 wheel | Diameter 4-300mm |
| Alloy 42 sheet | Thickness 0.5-20mm |
| Alloy 42 Tape | Thickness 0.2-2mm |
| Alloy 42 strip | Thickness 10-50mm |
| Alloy 42 wire | Diameter 0.5-9mm |
| Alloy 42 Tube | – Hot Rolled Round Tube diameter 38 or more up to 244.5 mm, thickness from 3 to 25 mm -Cold drawn round tube diameter from 6 to 219.1mm thickness from 0.9 to 14.2mm |
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