Hi again folks, Re the ,Multilayer board that I asked about a while ago, well I'm well on my way with it now... And I just got a question about the 0v plane.. Should it be solid copper groundplane or should it be hatched? Recently I have started to use hatched groundplane to reduce the likelihood of the board warping due to uneven copper distribution, to make it better for etching and to reduce the amount of heat absorption when going through the Reflow oven. The question is, does any of this (or other stuff) apply to an inner layer? The board is 4 up as: Top = SMT components & some tracking. Top inner = 0v groundplane Bottom inner = Positive supply signals (not a single plane, but split into isolated supply signals) Bottom = Signal tracks that won't fit on the top. All the extra colours for the extra layers are doing my head in - a bit of optical overload. Matthew Lamkin. --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------