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Because the metal tin-lead solder type (Sn-Pb) that contains a mixture of 63Sn-37Pb and 60Sn-40Pb are the most popular jobs in the electronics industry, where there is a cheap. Have a good soldering properties melting temperature is in the appropriate range. There is a physical mechanical properties through metallurgy and good fatigue resistance properties, but there are still, however, toxicity due to a lead in high quantities. Therefore, it is used as part of the unleaded soldering metal replacement metal tin-lead solder type. (Sn-Pb) to reduce the problem of toxicity that affects the environment in accordance with the requirements of the European Commission or the e c (EC-European commission) regarding restrictions on the use of hazardous substances or hazardous substances (RoHS) on Restriction, is to reduce the amount of lead used in the electronics industry to prevent environmental problems from which unleaded soldering metals that are renewable will require various property are equivalent or close to the lead soldering metal is mixed to the original.
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