Chlorides and Chloride Oxides of Nonmetals, NESOI

Acting as a catch-all for nonmetal chlorides not enumerated elsewhere in Chapter 28, this heading splits at the 10-digit level into arsenic trichloride (2812190010) — a controlled precursor chemical — and all other chlorides and chloride oxides (2812190090), which span a broad range of industrial reagents. Arsenic trichloride carries additional regulatory scrutiny as a potential chemical-weapons precursor under international control regimes. Germany, India, and Japan are among the top suppliers, with South Korea and China also contributing meaningfully to US import volumes.