Welcome to Union City Filament

Company History

Engineering & Manufacturing


Established in 1950, Union City Filament has been developing proprietary processes for winding and forming tungsten, molybdenum, rhenium and their alloys into a myriad of designs for nearly 70 years.

Our processes make it possible for us to hold the tightest possible tolerances on dimensions and uniformity.

We are constantly researching new uses for our products like handheld vaporizers and surgical tools.

Our Products


Union City Filament’s products are primarily designed to be electron or ion sources either through direct emission or by heating dispenser or oxide cathodes.

Today, our filaments are being put to use in the latest mass spectrometers and other analytical sensors, ion implanters, leak detectors, vacuum ionization gauges, getters, and specialty infrared applications.

Facility Notes


Specialized cataphoretic and flame-spray coating operations

An 11,000 sq ft. advanced manufacturing area

Microscope driven work stations

A precision machine shop for custom tooling fabrication

Ultrasonic and chemical cleaning equipment

Automatic filament winding equipment for high volume items

6 high temperature hydrogen atmosphere furnaces for stress relieving, sintering, and annealing