Dear Technet:

I have just been asked if there is a soldermask that has a low moisture absorption property.
We have a pcboard that uses Taconics TLC material, which is absorbing moisture, and the engineer
would like to "encase" the board with a low moisture absorbing soldermask to solve this problem.

Does anyone know of anything that will work, or another way around this problem?

The engineer also asked me if anyone knew how to relate IPC-TM-650 2.6.2.1 "Water Absorption, Metal Clad Plastic Laminates"
to real life. What he means is, how does this test method, which dunks a pcboard into distilled water for 24 hours, relate to
70% humidity at 23C.

Thank you for your help.

Kaye Clayo
Sr. P. C. Board Designer
Keithley Instruments, Inc.


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