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
>
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