The only thing I've noticed is that when my NES computer (Epia M10000 in a NES shell, which is obviously plastic) is on, I do get a bit of interference in over-the-air TV reception, especially on ...

The shielding is composed of plastic, carbon nanotubes, and a foaming agent, for a lightweight corrosion-resistant coating. The carbon nanotube letdown ratio was only 1-2%, replacing higher loadings ...