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Date: | Friday, July 26, 1996 9:12AMFri, 26 Jul 96 8:21 |
Content-Type: | TEXT/PLAIN |
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I know of no published articles on the extent of free sulfur in cardboard
manufacturing.
In our product, we are extremely sensitive to free sulfur and the corrosive
effects it has on the silver electrodes of our piezoelectric ceramics. We
have successfully shipped and stored these ceramic elements in cardboard
boxes for years without problems. We have done extensive testing of any
product that comes in contact with this ceramic from production processes,
soldering, assembly etc. We have discovered that free sulfur in cardboard
was the least likely component of contamination.
The bottom line is, when in doubt, test! The test is accurate and
inexpensive. Tape a small piece of pure silver foil to the material in
question, and age at 150 F for 48 hours. Examine the silver foil for signs
of discoloration. Be carful, as many types of tape have free sulfur.
Darrell Bonzo
EDO Corporation/Acoustic Division
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From: 'mail@ih <[log in to unmask]>'
To: dabonz; jasatt; 'mail@ih <[log in to unmask]>'
Subject: Cardboard boxes
I have heard for years that packaging electronic components(terminals,
connectors, etc.) in cardboard boxes is bad. The problem being that the
sulfur in the cardboard will eventually contaminate the solderable surfaces,
resulting in solderability problems. The solution is to package in a
non-permeable sealed bag(plastic) inside the box. I have never been able
to find any documentation to prove or dis-prove this issue. If anyone
knows of a published aricle, please contact me with the info.
Thanks
[log in to unmask]
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