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January 1997

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40:57 1997
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RE: Copper
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Stella,

i suppose the copper chlorides come from a dirty bare board (residues of
HAL-flux) . If it is possible check the cleanliness of a bare board by
using IPC-Testmethod 2.3.25 (IPC-6012  3.10.2.1). 

If ROL1-Flux (RMA) was used, you cannot find many chlorides by
EDX-Analysis. 

Karl Ring
ZVE  Germany




 

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