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In page RoHS:

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Care must be taken in selection of RoHS solders as some formulations are harder with less ductility, increasing the likelihood of cracks instead of plastic deformation, which is typical for lead-containing solders.[citation needed] Cracks can occur due to thermal or mechanical forces acting on components or the circuit board, the former being more common during manufacturing and the latter in the field. RoHS solders exhibit advantages and disadvantages in these respects, dependent on packaging and formulation.[5]