Overview
JIG-101 was the first widely-shared list of what to declare in electronics, and the direct ancestor of today's IEC 62474 list.
Why it still matters
JIG-101 proved the model the whole industry now relies on: one agreed list of substances, with thresholds and the reason each one is listed. When IEC 62474 launched with a continuously-maintained database, JIG-101 was retired in its favour.
Note
You'll still meet "JIG" in older supplier documents and templates. Treat it as historical. The live reference is the IEC 62474 Declarable Substance List.
Note: Educational summary maintained by the Pareo team.