Solder alloys

Hence a wide range of solder alloys exist, and only major ones are listed below.

Since early 2000s the use of lead in solder alloys is discouraged by several governmental guidelines in the European Union, Japan and other countries,[1] such as Restriction of Hazardous Substances Directive and Waste Electrical and Electronic Equipment Directive.

Indium-tin alloys with high indium content have very low tensile strength.

[11] For soldering semiconductor materials, e.g. die attachment of silicon, germanium and gallium arsenide, it is important that the solder contains no impurities that could cause doping in the wrong direction.

The thermal conductivity of common solders ranges from 30 to 400 W/(m·K), and the density from 9.25 to 15.00 g/cm3.