Welcome to Union City Filament

Company History

Engineering & Manufacturing

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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

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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

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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

Quality Assurance & Wire Testing

Before the manufacturing process begins, we place all incoming raw material through a rigorous inspection process that includes dimensional, density, electrical, ductility and crack testing.

This includes testing our through our Eddy Current Module and Laser Micrometer. Eddy Current Testing is a form of nondestructive testing, which when applied to fine wire will identify splits or fractures which would cause premature product failure. Every meter of wire that we advance to production is tested by our eddy current module to certify that it is free of any such imperfections. A laser micrometer is used in conjunction with our eddy current module to verify that all wire is within dimensional tolerances. The laser micrometer takes measurements on three axes while also calculating uniformity of roundness. The system is accurate to .000005”.

Once raw materials are advanced to production, our staff performs first article and in-process evaluations to ensure that all units are being fabricated exactly to specification. After production, our quality assurance team certifies that our products are dimensionally accurate, free of cracks and voids, and are achieving the proper electrical resistance.

Union City Filament is the only filament and heater manufacturing source worldwide to provide and certify this level of testing on all products.

One of the first stages of Union City Filament’s manufacturing process is the certification of raw materials through our eddy current module and laser micrometer.

Eddy Current Testing is a form of nondestructive testing, which when applied to fine wire will identify splits or fractures which would cause premature product failure. Every meter of wire that we advance to production is tested by our eddy current module to certify that it is free of any such imperfections.

A laser micrometer is used in conjunction with our eddy current module to verify that all wire is within dimensional tolerances. The laser micrometer takes measurements on three axes while also calculating uniformity of roundness. The system is accurate to .000005”.

Union City Filament also provides these tests as a service for customer purchased material. The certification includes weight, cold resistance, laser micrometer, and eddy current testing. Our engineers will interpret the results and provide you with all findings and conclusions.

Supply Chain Management and Sourcing

Union City Filament keeps a large inventory of raw materials for the fabrication of our products. This allows us to quote shorter lead times and control production costs. We only source raw materials from a handful of highly curated producers, of which we have worked with for decades, ensuring only the finest ingredients are used to make our products.

Regardless of what your end application is, Union City Filament’s expert engineers will work with you to design the best filament or heater to suit your needs.

Questions? Contact us today for help.

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