The characteristic features of soft solders are low melting point, relatively low tensile strength, good plasticity and low hardness (about 15HB). Their biggest advantage is the ability to make connections in relatively low temperatures. Therefore it is possible to solder materials which are sensitive to overheating or in the direct proximity of such materials. Among soft solders the widest applications have Tin-Lead alloys although because of Lead content in above-mentioned alloys, Tin based solders with copper or silver additives are being more and more used.
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