I want to cast items out of epoxy resin. They will be tools used to handle ESD sensitive devices, so they need to at dissipate static charge, or perhaps somewhat conduct. Resins used will vary depending on the part.
Unfortunately, resin suppliers seem to never give any data on electrical conductivity. I presume it's extremely low. So to have it conduct, am I right in saying I could mix in something like graphite to help conduction? I presume it would reduce strength, or at least change some physical properties, but that's fine.
I've previously experimented mixing graphite powder with non-conductive powders - No liquids or glue, and just compacted by hand in a glass tube. I found that the resistivity could not be controlled easily / effectively by varying the ratio; it seemed it either conducted quite well, or not at all, to the degree where fine tuning ratios would too unreliable.
Might that be the case with epoxy resin as well? How might I increase the conductivity of a resin? And how might it be tunable? Principles / formulas? I presume the geometry, size and other physical properties of the powder used is important, as well as, perhaps, the resin?