Hi Phil - solder "dross" is primarily solder oxide so if we are talking
tin/lead solder then the dross is mostly tin oxide with minor accumulations
of the other solder alloy elements and/or metals from the assemblies you
have been processing - elements like copper, gold, silver, nickel, etc.
Depending on how you have removed the dross from the solder pot, you will
also have some small amounts of the solder alloy contained in the dross
(i.e. tin and lead particles). The solder suppliers and other recycling
companies will purchase your dross material to recover the valuable
elements and the solder content.  My recommendation is to start a
conversation with  your solder supplier about your dross. Good luck.

Dave Hillman
Rockwell Collins
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On Tue, Aug 28, 2018 at 10:20 AM, Nutting, Phil <[log in to unmask]>
wrote:

> Yes, we still use some tin/lead solder.  A question came up recently about
> storing tin/lead dross from a wave solder machine because it was "hazardous
> material".  We would want to store it until we had enough material to make
> recycling it cost effective.
>
> How different is dross from raw bar solder of the same alloy?
>
> Phil Nutting  |  HVP Senior Development Engineer   |  Excelitas
> Technologies Corp
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