PCB finishes will dictate storage conditions.  HASL and ENIG finishes
are generally preserved well beyond a year when stored in Poly bags in
an environment 65-75 F and 40-60 RH.  IT/IS finishes should be stored in
VAC packaging available with most PCB suppliers - you may want to add a
RH indicator to let you now if any seal failures from handling.  OSP is
basically a finish that should be avoided, but stored in VAC packaging,
with a indicator and desiccant should preserve this finish for at least
6 months although the history of OSP as a preservative is not good -
mainly was used in captive shops where time to assembly was managed
easily, as well as rework which seems to be a prerequisite with OSP.

    



Jeffrey Bush
Director, Quality Assurance and Technical Support

                          76 Technology Drive - POB 1890
                             Brattleboro, Vermont 05302-1890
                                Tel. 802.257.4571.21 Fax. 802.257.0011
                                    [log in to unmask]
                              http://www.vtcircuits.com	



-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]] 
Sent: Wednesday, March 24, 2004 2:38 AM
To: [log in to unmask]
Subject: Re: [TN] pcb storage


Dry, cool conditions, in sealed hermetic containers (preferably metal),
but NOT in polyethylene bags.

Brian

Rey Degollado wrote:

> Hello guys,
>
> does anybody has an idea on what suitable storage condition for pc 
> boards (humidity / temp.)? we just want to know how to store solder, 
> gold and osp finished boards.
>
>
> Thanks,
>
>
> Rey Degollado
>
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