Hi Frank, Have you checked http://people.ne.mediaone.net/sgoodell/chapter30/ch30.html ? It's a complete chapter of the "Printed Circuits Materials Handbook", with lots of info about the HASL coating and it's specifications. Kind regards, Daan Terstegge SMT Centre Thales Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> Frank Kimmey <[log in to unmask]> 08/22 4:13 pm >>> Good Day to all, Hope you can assist with a HASL question (Werner are you out there?) We are considering some new vendors and they are requesting we reduce our HASL thickness requirements. We presently spec 100 to 500 microinches and vendors say they would like to see 40 to 1000 microinches. Now the questions: 1. Will 40 microinches cause intermetallic issues? 2. Will 40 microinches cause major shelf live issues? Expected shelf life 3mos, 6mos, 1 year for sealed in plastic, low humidity? 3. Since I am not comfortable with 1 mil of tin/lead should 500 microinches be enough? I appreciate you comments (Steve, Dave, everyone). Thanks in Advance, FNK Frank N Kimmey, C.I.D. Senior PCB Designer Powerwave Technologies PH. 916-941-3159 Fax 916-941-3195 --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------