SPI Supplies Spectroscopic Pure Graphite Rods for Evaporation 3/16 x 12" (4.8 x 305 mm)

SPI Supplies® Spectroscopic Pure Graphite Rods for Evaporation 3/16x 12" (4.8x305 mm):

SPI Supplies, like a lot of the rest of the world, has been calling their graphite rods "carbon rods". Putting it simply, a lot of users who are using what they call "carbon rods" have really been using graphite rods without realizing it. Since the resistivity of carbon and graphite, in general are quite different (the resistivity of carbon is much higher, typically about four times higher, but the exact resistivity will depend on the particular density of the rod), if a vacuum evaporator is configured for the resistivity associated with graphite, then it will work best on graphite and if a real carbon rod is substituted, then it will operate somewhat differently (in extreme cases, not at all). So you do want to be sure before ordering that you are indeed placing your order for the right kind of rod.