Peter, You are correct. I was not thinking of conformal coating, just tape as insulation. Which I have used on a PCB to solve primary to secondary creepage and clearance problems.
Regards, Duane Marcroft Telecom Consultant Peer Communications [email protected] >Duane - > >As far as I know, safety certification agencies don't accept tapes as a >conformal coatings; if you know otherwise, please share your experience. > >Silk-screened coatings can be considered as conformal coatings, depending on >which test house you're talking to, provided they go through whatever level >of type evaluation, follow-up inspection and quality control. The hassle is >hardly worth the effort, in most cases. > > >Regards, > >Peter L. Tarver >Nortel >[email protected] > >> Duane J. Marcroft wrote: >> > >> > Richard, >> > >> > The PCB coating is silkscreened. Because it is a silkscreen, it is by >> its >> > very nature unreliable as an insulator. Silkscreening produces many >> voids >> > in the surface (air bubbles) and too much variation in coating >> thickness. >> > As a consequence it cannot be considered. >> > >> > To be an viable insulator (in calculating creepage and clearance) >> coating must >> > be at least 2 layers of film (sheet or tape of Kapton.. etc). In the >> > opinion of many in the industry a silkscreen coating is too unreliable >> to >> > be considered. >> > >> > Duane Marcroft >> > Telecom and Data Communications Consutant >> > >> > ___________________________________ >> > >>
