Electrician's alloy is a combination of materials used by electricians in their work. SOLDER, which is composed of lead and tin, is the most common alloy used by electricians. SDER, which stands for silver-doped tin-lead eutectic, is another alloy used by electricians. It is composed of tin, lead, and silver, and is used for soldering electrical components. Both alloys are used to join two or more metal surfaces together.