… Phosphides, whether or not chemically defined, excluding ferrophosphorus; other inorganic compounds (including distilled …
Explanatory notes
… 28.53 ‑ Phosphides, whether or not chemically defined, excluding … with water, give off hydrogen phosphides which ignite spontaneously. Used with calcium carbide for naval signals … COMPOUNDS Inorganic chemical products not elsewhere specified or included are also included in this heading …