Subject:                              Time:  3:16 PM
  OFFICE MEMO         RE>PWA Corrosion Test                 Date:  2/1/96

Mickey -- to my knowledge, the gas corrosion tests were developed many years
ago by Battelle Labs, I believe in their Columbus OH facility.  The test
method at that time used a combination of 3 gasses and was used for the
acceleration of "fritting corrosion" between a printed board assembly's
edge-board contacts and their mated connector contacts.  Mechanical movement
(rocking-like motion in a "card-cage") of the printed board assemblies
similated small amplitude vibrations.  My memory seems to remember some people
adapting the test for accelerated aging for solderability testing.  I believe
they had correlation problems between test results and actual boards.  

At your request, I could check my files to see if I still have the
information.

R#004#alph Hersey
Lawrence Livermore National Laboratory
PHN 510.422.7430
FAX 510.424.6886
e-mail  [log in to unmask]

---------------
 We have a customer requesting that products supplied  
 shall pass the following test, specified in IEC 68-2-60 TTD:
 Technical Trend Document (TTD)
 Test Ke: Corrosion tests in artificial atmosphere at very low
          concentration of polluting gas(es).
          Method C:  
    Mixture of polluting gases:
               so2 (0.5+/-0.1)10to the power of-6 (vol/vol)	
               h2s (0.1+/-0.02)10 to the power of -6 (vol/vol)
    with defined: temperature, humidity and time duration.   
     
  Has anyone performed the above tests or know an independent
  laboratory that performs them (European location is preferred).	
  
  Thanks in advance for any response.

   michael weiner
   e-mail: [log in to unmask]