Q. We are considering using e-coat to paint electrical cabinets and wanted to know if you could tell me the dielectric strength of e-coat and the relationship with electrical isolation. Thank you in advance. K.F.B.
A. The dielectric strength of a material defines its capacity to withstand electrical fields without breaking down, and the formation of an electrically conductive path.
For a cured e-coat film, the value of the dielectric strength depends on the type and proportions or ratios of the specific resin and pigment used by your e-coat supplier, and to the degree or percentage of cure accomplished. For a normally cured automotive e-coat film, cathodic epoxy, black, and with a medium p/b ratio of 0.1 - 0.2, the dielectric constant of the cured film is 3.9 MVolts/meter. As a comparison, the dielectric constant of neoprene rubber is five times greater.
The more e-coat film you apply, the more electrical resistivity your electrical cabinets will have. Additionally, the resistance of the cabinet for voltage jumps will be increased.
Choosing the right conveyor system, coating technology, and ancillary equipment.
This paper is a peer-reviewed and edited version of a presentation delivered at NASF SUR/FIN 2012 in Las Vegas, Nev., on June 12, 2012.
How do you measure the surface area of a threaded fastener? How much coating would you put on it? How thick of a coating? What about non-threaded fasteners? The U.S. Department of Agriculture’s Forest Service, of all people, may have come up with the solution for those pondering how to coat sometimes-difficult small pieces using computer imaging and software to compute the area.