For example, SiC in its raw form falls under the HTS subheading 2849.20.1000 for "carbides and carbide-based products; chemical formulations for carbides; whether or not chemically defined." Meanwhile, SiC powders and whiskers used in the manufacture of electronic devices are classified under 2849.20.2000 for "carbides and carbide-based products; chemical formulations for carbides; other."

that has been processed into specific shapes for use in armor or high temperature structural applications falls under HTS subheading 6902.20.1000 for "silicon carbide, whether or not chemically defined; plates, sticks, tips, and the like for tools, unmounted." Meanwhile, SiC fibers used in composite materials are classified under 6815.10.0000 for "articles of stone or other mineral substances; containing over 50% by weight of silicon carbide."