|Ask the Experts|
August 20, 2012
Mixing SAC305 and SACX0307 Solder Alloys
What is the effect of mixing solder alloys? For example mixing SAC305 and SACX0307? We have a huge inventory of SAC305 and we don't know what to do with it.
|Expert Panel Responses|
Theeffects are unknown because you would really never know the exact alloy you areworking with at any given time. I would recommend disposition ofyour SAC305 either by selling, disposing (return to OEM), or using in it's pureform.
M.O.L.E. Line Product Manager
Electronic Controls Design, Inc. (ECD)
These alloys reallyshould not be mixed together. The benefits of the SAC305 system are alittle different than those from the SACX0307 system, and mixing the alloystogether could produce unknown side effects. If you are committed to thelow-Silver alloy (SACX0307), there are certain benefits that you should beexpecting that would be diluted if you mixed in the SAC305 alloy.Additionally, the melting temperature of the material in the solder potcould be impacted by mixing the two alloys together, which could lead to pooralloy flow and poor hole-fill as a result. The SAC305 bar solderin your inventory has value, without any doubt, and there are companies thatwill pay you for this material. I would recommend contacting your barsolder supplier and/or a metal reclaimer to see who will make you the bestoffer for your SAC305 alloy material.
General Manager - Electronic Assembly Americas
I would not recommendmixing the alloys. You maybe able to talk to your solder supplier andexchange the alloy with them.
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