When testing for dendritic growth, we tend to use a Siemens test 
     method (E-Corrosion, SN57030). Briefly, this test employs a specific 
     test pattern and the following test conditions:
     
     1. CONDITIONING
     (a)     2 hours @23degC/ 50%RH
     (b)     take initial resistance measurement @500V bias (c)     10 
     hours @40degC/ 20%RH, 100V bias
     2. TEST
     21 days at 40degC/ 90%RH, 100V bias
     measure resistance periodically @500V bias (check for dendritic growth 
     at these times)
     3. END (after 21 days)
     measure resistance @500V bias
     remove from oven, leave for 1 hour, measure resistance      again. 
     We tend to apply the SM840B, Class C specification for insulation 
     resistance to these panels, as well as examining for dendrites.
     Siemens developed this test at their plant in Munich.  The address is 
     as   follows:
     Siemens AG
     Dept. ZFE GR Technische Normung
     Otto Hahn Ring 6
     D8000 Munchen 83
     Germany
     
     In addition there has been a great deal of correspondence on this 
     subject already.  You might find some more information  by searching 
     the TechNet archive.  The archive can be found on the WWW at           
     http://www.automata.com/ipc/TechNet/
     
     I hope this is of some use.  Give me a call if you need more info.
     
     David Albin
     Coates Circuit Products
     [log in to unmask]
     Tel 00 44 1761 408513

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