I am looking for some information, studies, past experience, whatever I can find for information about barrel cracking in small diameter vias (0.2mm) on an 8 layer, 1.6mm pcb. I am having a very large issue with this and I am unsure at this point if the problem lies in the use of the 0.2mm vias, the manufacturers abilities, the materials being used, etc. If someone has some information they can point me to, it would be greatly appreciated!! I need to find out what we/I can do to increase the reliability of the vias. Dale R. Potter Associate Product Engineer --------------------------------------------------------------------------------- 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 temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------