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Are lead-free alloys compatible with no clean flux chemistries?

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Are lead-free alloys compatible with no clean flux chemistries?

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Many users of fluxes and solder pastes have (justifiably) wondered if they will have to switch chemistries when they switch to a lead-free process. The answer is: It depends. If you switch to a high melting point alloy such as tin-silver or tin-copper, then it is likely that a change will have to be made. However, with lower melting point lead-free alloys (If there exists any) it is much more likely that you can continue to use the same flux chemistry without resulting in charred residues, dewetting, cleaning difficulties, etc. Of course, this is most dependent upon the thermal stability of the flux chemistry being used.

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