Hi All, I have a customer who is need of an extremely thin, smooth (preferably glossy), abrasion resistant coating that can be applied to the surface of a printed circuit board. Without going into too much detail, an abrasive material is slid across the surface of board and needs to be held in intimate contact to the board surface. There is a dielectric layer covering the actual circuitry. This started out as soldermask but this wore through rather quickly. 2nd genreation was a single ply of 0104 prepreg. This also wore through too quickly. The surface dielectric coating thickness can be increased provided the Dk of the material is also increased. Some ideas that have surfaced so far are a Paralene (sp?) coating, or a silcon nitride coating. I have no experience with either and don't know where to even start to look for these. Any help and suggestions would be greatly appreciated. Andy Slade Sr. Product Engineer New Product Introduction HADCO Tech Center One Ph.(603)-896-2210 Fx.(603)-898-0912 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************