Layered sheets of copper tungsten foil EDM foil next to a penny for scale.

Foils and EDM

With their favorable characteristics, copper-tungsten electrodes are readily used as electrodes in EDM. Copper-tungsten’s machinability and malleability make it ideal for cutting and shaping, lending these electrodes a great deal of flexibility. Sheets of copper-tungsten can be shaped and machined on the fly to meet changing machining demands, making these ideal for prototyping and stress testing applications. The electrical conductivity of copper-tungsten also ensures that power isn’t wasted in trying to overcome resistance.

Precision Foils

A precision-machined copper-tungsten plate held in a micrometer.

We are now capable of manufacturing copper-tungsten sheet to an unprecedented level of flatness. Our precision-machining methods allow us to achieve tolerances as tight as +/-0.00005” (+/-0.00127 mm). Quality can be assured with our calibrated and certified Johansson Mikrokator, a comparator gauge that can measure a surface’s deviation from a standard thickness to one one hundred thousandth of an inch. If you can’t spare a hair of inaccuracy, these foils are the way to go.

Our Foils

The following parts list is not representative of all available foils. We offer foils from 25mm to 600mm in width and height, with the minimum thickness being .05mm, or 50 microns. Alloy percentages go from 70% to 60% tungsten, and 30% to 40% copper.

Product Code and Description

HP-050811CW
Thickness: .002″ / .0508mm L x W: 4″ x 4″ / 100mm x 100mm
HP-076211CW
Thickness: .003″ / .0762mm L x W: 4″ x 4″ / 100mm x 100mm
HP-101611CW
Thickness: .004″ / .1016mm L x W: 4″ x 4″ / 100mm x 100mm
HP-12711CW
Thickness: .005″ / .127mm L x W: 4″ x 4″ / 100mm x 100mm
HP-152411CW
Thickness: .006″ / .1524mm L x W: 4″ x 4″ / 100mm x 100mm
HP-177811CW
Thickness: .007″ / .1778mm L x W: 4″ x 4″ / 100mm x 100mm
HP-203211CW
Thickness: .008″ / .2032mm L x W: 4″ x 4″ / 100mm x 100mm
HP-228611CW
Thickness: .009″ / .2286mm L x W: 4″ x 4″ / 100mm x 100mm
HP-25411CW
Thickness: .010″ / .254mm L x W: 4″ x 4″ / 100mm x 100mm
HP-279411CW
Thickness: .011″ / .2794mm L x W: 4″ x 4″ / 100mm x 100mm
HP-304811CW
Thickness: .012″ / .3048mm L x W: 4″ x 4″ / 100mm x 100mm
HP-330211CW
Thickness: .013″ / .3302mm L x W: 4″ x 4″ / 100mm x 100mm
HP-355611CW
Thickness: .014″ / .3556mm L x W: 4″ x 4″ / 100mm x 100mm
HP-38111CW
Thickness: .015″ / .381mm L x W: 4″ x 4″ / 100mm x 100mm
HP-406411CW
Thickness: .016″ / .4064mm L x W: 4″ x 4″ / 100mm x 100mm
HP-431811CW
Thickness: .017″ / .4318mm L x W: 4″ x 4″ / 100mm x 100mm
HP-457211CW
Thickness: .018″ / .4572mm L x W: 4″ x 4″ / 100mm x 100mm
HP-482611CW
Thickness: .019″ / .4826mm L x W: 4″ x 4″ / 100mm x 100mm
HP-50811CW
Thickness: .020″ / .508mm L x W: 4″ x 4″ / 100mm x 100mm
HP-533411CW
Thickness: .021″ / .5334mm L x W: 4″ x 4″ / 100mm x 100mm
HP-558811CW
Thickness: .022″ / .5588mm L x W: 4″ x 4″ / 100mm x 100mm
HP-584211CW
Thickness: .023″ / .5842mm L x W: 4″ x 4″ / 100mm x 100mm
HP-609611CW
Thickness: .024″ / .6096mm L x W: 4″ x 4″ / 100mm x 100mm
HP-63511CW
Thickness: .025″ / .635mm L x W: 4″ x 4″ / 100mm x 100mm
HP-660411CW
Thickness: .026″ / .6604mm L x W: 4″ x 4″ / 100mm x 100mm
HP-685811CW
Thickness: .027″ / .6858mm L x W: 4″ x 4″ / 100mm x 100mm
HP-711211CW
Thickness: .028″ / .7112mm L x W: 4″ x 4″ / 100mm x 100mm
HP-733611CW
Thickness: .029″ / .7336mm L x W: 4″ x 4″ / 100mm x 100mm
HP-76211CW
Thickness: .030″ / .762mm L x W: 4″ x 4″ / 100mm x 100mm
HP-787411CW
Thickness: .031″ / .7874mm L x W: 4″ x 4″ / 100mm x 100mm
HP-812811CW
Thickness: .032″ / .8128mm L x W: 4″ x 4″ / 100mm x 100mm
HP-838211CW
Thickness: .033″ / .8381mm L x W: 4″ x 4″ / 100mm x 100mm
HP-863611CW
Thickness: .034″ / .8636mm L x W: 4″ x 4″ / 100mm x 100mm
HP-88911CW
Thickness: .035″ / .8891mm L x W: 4″ x 4″ / 100mm x 100mm
HP-914411CW
Thickness: .036″ / .9144mm L x W: 4″ x 4″ / 100mm x 100mm
HP-939811CW
Thickness: .037″ / .9398mm L x W: 4″ x 4″ / 100mm x 100mm
HP-965211CW
Thickness: .038″ / .9652mm L x W: 4″ x 4″ / 100mm x 100mm
HP-990611CW
Thickness: .039″ / .9906mm L x W: 4″ x 4″ / 100mm x 100mm
HP-111CW
Thickness: .03937″ / 1.0mm L x W: 4″ x 4″ / 100mm x 100mm