So you may note the points from Wilson (ICT/ESD etc). Any details from customer during last discussion? Any component on WIP is sensitive to environment? On 20 Apr 2009 17:09, Wilson Poon wrote: > > Hi James, > > Keep in ESD safe environment is fine for short period (say 1 to 2 > days). I have no data for the PCB keep longer than 1 month. It will > cause oxidation of PCBA test pads. ICT become a challenge. Hand > soldering for components on the long storage is not good. As I > mentioned before, delamination may happen. > > B.R. > > Wilson Poon > > Tel: 13554723480 > > S/Phone: 692268 > > ------------------------------------------------------------------------ > > *From:* James lee [mailto:[log in to unmask]] > *Sent:* Monday, April 20, 2009 5:02 PM > *To:* Wilson Poon; 'Asia Committe Task Group Forum' > *Subject:* 答复: [TGAsia] storage of PCBA WIP > > Dear Wilson, > > The point is all the PCBA WIP no need to conduct neither second reflow > nor wave soldering process( but perhaps partial of the boards need > hand soldering one or two components ), > > and just waiting some assembly materials to finish it. > > Thanks & Regards > > James Lee > > ------------------------------------------------------------------------ > > *发件人:* Wilson Poon [mailto:[log in to unmask]] > *发送时间:* 2009年4月20日 16:58 > *收件人:* Asia Committe Task Group Forum; James lee > *主题:* RE: [TGAsia] storage of PCBA WIP > > Hi James, > > Will WIP SMT PCBA run Wave Soldering afterwards? Will the PTH do Hand > Soldering afterwards? If yes, the long storage on work floor is not > appropriate. The PCB and components will absorb moisture and cause > components crack or PCB delamination during second reflow or wave > soldering or even hand soldering. Refer IPC J-STD-033A to control the WIP. > > B.R. > > Wilson Poon > > ------------------------------------------------------------------------ > > *From:* TGAsia [mailto:[log in to unmask]] *On Behalf Of *James lee > *Sent:* Monday, April 20, 2009 4:25 PM > *To:* [log in to unmask] > *Subject:* [TGAsia] storage of PCBA WIP > > Dear Friends, > > One of our customer question our PCBA WIP management procedure since > he saw some of SMT / PTH subassemblies boards were keeping in > production area longer than 3 days, > > Some of the boards are longer than one weeks and even a few pcs longer > than 1 month, so we had a big discussion about the shelf life of the > assembly boards but end of our discussion > > It seems he was not convinced, hereby I need your help to let know is > there any IPC standards to describe this rule? > > Thanks & Regards > > James Lee > > Legal Disclaimer: The information contained in this message may be > privileged and confidential. It is intended to be read only by the > individual or entity to whom it is addressed or by their designee. If > the reader of this message is not the intended recipient, you are on > notice that any distribution of this message, in any form, is strictly > prohibited. If you have received this message in error, please > immediately notify the sender and delete or destroy any copy of this > message > > Legal Disclaimer: The information contained in this message may be > privileged and confidential. It is intended to be read only by the > individual or entity to whom it is addressed or by their designee. If > the reader of this message is not the intended recipient, you are on > notice that any distribution of this message, in any form, is strictly > prohibited. If you have received this message in error, please > immediately notify the sender and delete or destroy any copy of this > message > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.287 / Virus Database: 270.12.0/2066 - Release Date: > 04/19/09 20:04:00 >