Jason,

PWB moisture content can be weighed to within .000 gram.
However, .00 gram is a good measurement. First, weigh PWB
at ambient environment to determine weight. Then bake dry.
Recommended time and temperature is 5 hours @ 120C. Then
weigh dry weight and compare difference. Trick is to know
acceptable moisture content prior to reflow.

Thank you,

Maury Harris


-----Original Message-----
From: Jason Gregory [mailto:[log in to unmask]]
Sent: Tuesday, January 15, 2002 2:33 PM
To: [log in to unmask]
Subject: Re: [TN] PWB Moisture


Is there a spec for this? Besides, how do (or would) you measure moisture
levels? Can it effectively be measured by weight? Got me on that one!

Jason

>>> [log in to unmask] 01/15/02 02:05PM >>>
Anyone,

What is the max absorbed moisture a PWB may have prior to reflow soldering?
Also, what IPC or Mil-Spec addresses PWB moisture?

Thank you,

Maury Harris
EFTC-SCO Engineering
602 282-5179
[log in to unmask]

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