Thick Film Epoxy Dip Coating For Bus Bar.

Applying thick film epoxy dip coating to BUSBAR for the purpose of electrical insulation using heat allows for a robust layer of 12 to 20 thousandths of an inch (0.3 to 0.5 mm) to prevent electrical arcing and provide thermal stability.
Dielectric test to withstand AC3700V 50/60Hz for 1 minute.
Thickness of epoxy powder coating: 16 thousandths of an inch (0.4 mm).

Writing a busbar coating spec? See How Thick Does Busbar Epoxy Really Need to Be?

Edges matter more than thickness: see How Thick Does Busbar Epoxy Really Need to Be?