SN100C contains no phosphorus. It has a dross rate equal or lower than tin-lead solder, where as SAC drosses at 2 to 3 times the dross rate of tin-lead solder.
Addition of solder dross inhibitors, such as phosphorus, can be effective inhibitors of dross formation, though phosphorus has been known to increase Sn corrosivity of copper [Sprovieri, 2004]. Higher dross rates may make the use of solder skimming or purifying equipment desirable, but care should be taken to not use the equipment on both SnPb and Pb-free solders to prevent lead contamination of the dross, which would preclude recycling. [Solders in Electronics: A Life-Cycle Assessment Summary, US EPA, EPA-744-S-05-001 August 2005]
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