Wow, how long an answer do you want? saw Steve' reply and agree that "poor wetting" is sometimes a perception rather than reality. In addition to what Steve described I have had several other "poor wetting" issues that took considerable explanation to quality. A tapered lead that has a large shoulder may have solder suddenly stop because of the rapid heat dissipation at the larger area. This was being rejected untill I could finally convince QA. of what was happening. Give us some more info and I am sure you will get several relevant replies. Charles Caswell Process Lead, PCB Frontier Electronic Systems -----Original Message----- From: TechNet E-Mail Forum. [mailto:[log in to unmask]] Sent: Friday, October 05, 2001 8:59 AM To: [log in to unmask] Subject: [TN] Poor wetting on solder joints What could be the cause of poor wetting on solder joints and how we can solve it? ------------------------------------------------------------------------ --------- 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 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------