SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-acid-core-solder

Which type of solder should NOT be used for radio and electronic work?

Acid-core solder.

  1. Rosin-core solder
  2. Tin-copper solder
  3. Acid-core solder ✔

Why: Acid-core solder is made for plumbing. Its acid flux can corrode electronic parts and circuit boards, so electronics use rosin-core solder.

Huh, didn't know that: Rosin-core solder is the type meant for radio and electronics work.

The dad joke
Why did the solder bring a joke book to the workshop? It wanted to make a good joint impression.
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Sources

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 release) https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

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