What are the Composition of solder?

Solder is primarily composed of a mixture of metals, most commonly tin (Sn) and lead (Pb). Traditional solder typically consists of about 60% tin and 40% lead, known as 60/40 solder. In lead-free solders, alternatives like tin with copper (Cu), silver (Ag), or bismuth (Bi) are often used, with tin generally making up the majority of the composition. The specific composition can vary based on the application and required properties, such as melting point and strength.