Paper-Coated Magnet by NOMEX After being drawn or extruded from electrical round aluminum rod or oxygen-free copper rod using a particular mold, wire is wrapped in NOMEX paper of Type T410 from the US Du Pont Company. Transformers, electric welding machines, and other such electrical devices use it extensively. The best material for NOMEX paper wrapped wire is electrical bare copper or aluminum wire that has undergone an extrusion process.