Custom Filaments

Filament Configuration

Filaments are available in all shapes and sizes, both the filaments and welded assemblies can be produced in wire or ribbon material. Helical, arrow, straight, circle, and horseshoe-shaped configurations are just some of the many geometries we offer.

Filament Material

A choice of tungsten, iridium, molybdenum, rhenium, and platinum is available for custom forming to your required dimensions and tolerances.


Yttrium oxide (yttria) coating is available and can be applied to both wire-type and ribbon-type filaments. This coating is designed to offer the advantages of a burn-out resistant base metal and a low-work function coating, which enhances the operation of the filament in a variety of operating conditions. An inactive protective coating is also available as a final step in the manufacturing process.

Lanthanum Filaments

We offer lanthanum boride coated rhenium filaments for use in high vacuum (below 10-5 Torr) or inert environments. These filaments provide better power efficiency than other filament offerings from The Fredericks Company.