Hello Every Technetters. I was informed by our customer which is about vent hole at the BGA substrates? What is the vent hole's function? Why make some vent hole at the BGA substrates? Please give me more idea. Thanks Best regards SIMMTECH.CO.,Ltd. Quality & Reliability Assurance Team / Gilbert Min. --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------