Salts of Inorganic Acids or Peroxoacids (Excluding Azides), NESOI

Fulminates, cyanates, thiocyanates, selenides, and tellurides — along with a broad residual NESOI provision — make this a heterogeneous heading that catches specialty inorganic salts not captured by more specific headings in Chapter 28. The US schedule distinguishes fulminates/cyanates/thiocyanates (2842901000) from selenide/telluride salts (2842909010) and a general residual line (2842909050), reflecting differing end-use profiles in pharmaceuticals, photography, and semiconductor manufacturing. Germany and Canada lead import supply, with China, Indonesia, and the United Kingdom also among the primary sources. The chemical diversity of this heading means classification disputes are common, and importers should maintain detailed technical specifications.