'Afternoon, All, Today I need your help to find a good guide on how to select solder mask/resist materials and how to determine what thickness should be specified for particular applications. Immediately I need to know recommendations for 0.063" thick, 10 layer FR4 HASL finished VME conduction-cooled boards of 15 mil track spacing for military application. Boards will be Convection Reflow Soldered with Kester 63/37 solder and 331 flux. Anything else you need to know? I'm from a manufacturing background and have never needed to know this level of detail before. However, I am now involved with helping a bunch of design engineers who have even less idea than I do about this sort of thing than I have. I have had a go at the Web trying various terms and key words, but get absolutely nothing useful back at all, so I'm hoping our TechNet Goldmine/Delphi Oracle can succeed where the WWW has failed me. TIA, Pete Duncan --------------------------------------------------------------------------------- Technet 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 Technet To temporarily halt delivery of Technet send the following message: SET Technet 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 ---------------------------------------------------------------------------------