MXT manufactures ultra-fine fibers (down to 25 µm) by a patented process known as melt extraction. The process extracts the fiber from the molten tip of a rod or wire by means of a rapidly rotating wheel whose rim has been sharpened to a fine edge. Because the process is containerless, fibers may be made from highly reactive materials.

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[Front view of fiber pulling machine]
[Magnified view of fine metallic fibers]

High Permeability Magnetic Fibers

Characteristics include:
  • Permalloy or amorphous cobalt[Spacer][[Arrow]PDF]
  • DC magnetic permeability up to 106
  • AC permeability at 50 kHz up to 104[Spacer][[Arrow]PDF]
  • Tensile strength of 4 GPa
  • High giant magnetoimpedance (GMI)[Spacer][[Arrow]PDF]
  • Diameter of 30 µm
  • Availability as chopped in lengths of 2 to 10 cm or more, up to 10 m
Applications include:
  • Anticounterfeiting and authentication ("emid")
  • Antitheft tagging
  • Magnetic field sensing[Spacer][[Arrow]PDF]
  • Screening

Specialized Metallic Fibers

MXT's melt-spinning technology has been successfully used to extract fibers from reactive materials such as rare-earth alloys. If you are looking for metallic fibers that are not readily made by conventional processes, contact MXT to learn whether the melt extraction process can address your needs.


The melt extraction process has been successfully used to produce ceramic fibers [[Arrow]PDF] from a range of oxide ceramics. These fibers are flexible and as long as 20 meters. Contact MXT for more information.