SACXTM alloy contains an Anti-Oxidant Additive. This additive reduces the oxidation of the solder, but due to preferential oxidation over Tin, Silver and Copper it is consumed in the process.
For most medium/high volume operations the level of this dross reducing additive is naturally kept in equilibrium by the regular addition of fresh solder. For some lower volume operations where the wave is on for extended periods and the alloy usage is low the levels may need to be replenished by the small addition of SACXTM Anti-oxidant Additive.
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