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March 1999

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Subject:
Re: Circuit Card Cleanliness
From:
Stephen Brown <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 23 Mar 1999 10:03:35 GMT
Content-Type:
text/plain
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text/plain (31 lines) 
     Dave.

     Many years ago when I first started looking into post wave
     cleanliness comparisons between CFC cleaning and No Clean I used
     MIL-P-28809 as my standard. This Military Spec used to have the
     acceptance limits for the Ionograph and the old Alpha Metals
     Omegameter. The limits were.

     Omega Meter        2.2ug NaCl/cm2     14ug NaCl/in2
     Ionograph          3.1ug NaCl/cm2     20ug NaCl/in2

     How this spec compares against your IPC spec I couldn't say.

     Happy cleaning.

     Steve Brown.
     Psion Computers Ltd.
     Greenford, Middx. UK.

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