An engineer I used to work with said that when food products (like dry
cereal) are packaged, they typically fill the bag with dry nitrogen before
sealing the bag to extend shelf life.  The removal of oxygen and water vapor
greatly reduces oxidation, thus preserving freshness.  It seems to me that
this would work with PCB's, too, and would prevent the warpage problems that
might be caused by having a dessicant pouch in the vacuum sealed bag.


Dave Roach
Trane GCC
4833 White Bear Parkway
St. Paul, Minnesota  55110
651-407-4294

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Friday, May 20, 2005 10:32 AM
To: [log in to unmask]
Subject: Re: [TN] FW: storage conditions of PCB

The specifications require board are to be stored to preclude damage.
We store boards in 20C/40RHMAX in the packages intended to be shipped
with, which generally is VAC packed.  We have success with all finishes
beyond 1 year and HASL is 3 years.

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com


-----Original Message-----
From: Baski Devre [mailto:[log in to unmask]]
Sent: Friday, May 20, 2005 9:57 AM
To: [log in to unmask]
Subject: [TN] FW: storage conditions of PCB

Hi Technetters
        Do you know the any standards or method to store produced PCB.
or what are
the storage conditions of the PCB. If we want to keep them in warehouse
for
a long time what should we do or which standards do we obey?

BEST REGARDS
Yusuf GOMEC
Product Quality Engineer


BASKI DEVRE SAN. ve TIC. LTD. STI.
Ceyhan Sk. No:10 81490 Pendik-Istanbul-Turkey
Tel:0090 216 3901036(4 Line)/4836560(4 Line)
Fax:0090 216 3544941/4913269
Gsm:0090 533 6579897/7480014
Internet: www.baskidevre.com.tr

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