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Solderability of ELECTRO TIN PLATE PER ASTM B545

I recently changed the finish of copper parts from "ELECTRO TIN PLATE PER MIL-T-10727" to "ELECTRO TIN PLATE PER ASTM B545". These copper parts carry a high electrical current (up to 40ADC) and are solder to a Printed Circuit Board. Since the finish change, the solderability of the parts has deteriorated and there is a significant voltage drop in the solder joints.

Is the ASTM B545 equivalent to MIL-T-10727 regarding solderability? or should I specify a different finish?

Federico Dominguez

2006

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