Material
Alloy 42 (4J42)
Alloy 42 (4J42) is a 42% nickel-iron alloy engineered to match the thermal expansion of hard glass and ceramics for hermetic electronic sealing.
Manufacturing processes
CNC
About
Alloy 42 (4J42) or Nilo 42 (Fe-42Ni) offers good formability, solderability, and weldability, plus reasonable oxidation resistance in standard service. Unlike the cobalt-containing Kovar (4J29), Alloy 42 contains no cobalt, giving it a cost advantage where its slightly different expansion match is acceptable.
It is a good choice for IC lead frames, transistor housings, and electron tube seals.
Technical Details
- Accuracy
- ±0.2% (lower limit of ±0.13 mm)
- Density
- 8.15 g/cm³
- Min. wall thickness
- -
Technical Properties
- Tensile strength
- 482 - 490 MPa
- Tensile elongation
- 28 - 43%
- Embossing
- min. 0.3 mm
- Engraving
- min. 0.3 mm
- Warping risk
- N/A