Vu, I went through this process once before. I defined the process as Soldermask Dot Printing. Its not one stop shopping but it works. Set up one DP-10 screen exposing vias to be filled. Only fill the soldermask from one side. Three (3) passes may be required to push the soldermask to the solder side (pending board thkness). Soldermask dimples will be apparent on the solder side, but no need for concern. Two side filling will entrap air/moisutre in the via in-turn causing soldermask blowhole which may result in further process problems at assembly. Since filling the vias with mask is prior to HAL, entrapped air/moisture with component heat will oxidize the copper, in-turn may cause reliability issues. In other cases, oxidation propagates no further than the top micrometer barrier, therfore protecting the underlying copper (argueable). Any how, cure the LPI following Dot Print and proceed forward as normal. The mask was either Taiyo PSR4000 or Ciba Probimer 52. I have an idea of what you are trying to achieve. There is an alternative to what you are trying to process. Call me and I can explain further. John Gulley - QA 972-578-3928 [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: FAB: One step soldermasking to plug vias Author: "vu" <[log in to unmask]> at Internet Date: 11/14/96 3:10 PM This question probably has been asked before: Does anyone know an effective way to do one step soldermasking operation to plug via holes using DP-10 machine? Is there a preferred solder mask that can do this? Vu Minh Du Process Engineering PC World *************************************************************************** * 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. * *************************************************************************** *************************************************************************** * 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. * ***************************************************************************