What is rosin core solder?


Quick Answer

Rosin-core solder is narrow tube of soft metal surrounding an even narrower cylinder of rosin, a compound derived from pine resin. This type of solder is designed to join two electric or electronic elements to form a conductive circuit.

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Full Answer

Rosin is used as a flux; it melts before the metal, coating the parts to be soldered and helping the metal adhere to it. Without flux, the molten metals, usually tin and lead, but sometimes bismith instead of lead, tend to form a ball instead of sticking to the electronic parts. In plumbing, acid-core solder is often used, but acid is too damaging for use in electronics.

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