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 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************