Flash Joule Heating Devices pass a short, high-current pulse through a conductive sample so resistive heating drives the material past 2000 degrees C in milliseconds, far faster than any furnace. Output runs from 0 to 500 A at 0 to 40 V, with current ramp-up in 2 ms, pulse widths from 1 ms and up to 255 programmed pulses per run, reaching 3000 degrees C peak. A 500 mg sample sits on a 100 x 15 mm stage inside a vacuum chamber with water cooling and a sapphire viewing window. Touch screen programming and PC connectivity log each pulse. Typical uses include flash graphene from waste carbon, carbon nanotubes, metal nanoparticles, high-entropy alloys, battery electrode materials and catalysts.