Material
4J50 (FeNi50)
4J50 is a nickel-iron precision alloy with thermal expansion matched for soft-glass and ceramic sealing, plus soft-magnetic characteristics.
Manufacturing processes
CNC
About
4J50 (FeNi50, also called Vacovit 500 or Nilo 51) is a nickel-iron alloy whose thermal expansion coefficient and Curie point run higher than lower-nickel grades like 4J42, which makes it suited to soft glass and ceramic sealing rather than hard borosilicate glass. It also shows soft-magnetic behavior, with low coercivity and useful permeability.
This is a material that's suitable for precision impedance diaphragms, reed relays, and soft-glass-sealed vacuum components.
Technical Details
- Accuracy
- ±0.2% (lower limit of ±0.13 mm)
- Density
- 8.21 g/cm³
- Min. wall thickness
- -
Technical Properties
- Embossing
- min. 0.3 mm
- Engraving
- min. 0.3 mm
- Warping risk
- N/A