NOW FOR USA HTS Harmonized Tariff Schedule (2024 HTS Revision 10)
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Harmonized Tariff Schedule (2024 HTS Revision 10)

Heading Duty(general) Duty(china) Article Description Compare Code
2506.20.00.10 Free  The duty provided in the applicable subheading + 25%  Crude or roughly trimmed --
2506.20.00.80 Free  The duty provided in the applicable subheading + 25%  Other vs-2506200010
2507.00.00.00 Free  The duty provided in the applicable subheading + 25%  Kaolin and other kaolinic clays, whether or not calcined vs-2506200080
2508     Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: vs-2507000000
2508.10.00.00 Free  The duty provided in the applicable subheading + 25%  Bentonite vs-2508
2508.30.00.00 Free    Fire-clay vs-2508100000
2508.40.01 Free  The duty provided in the applicable subheading + 25%  Other clays vs-2508300000
2508.40.01.10 Free  The duty provided in the applicable subheading + 25%  Common blue clay and other ball clays vs-25084001
2508.40.01.20 Free  The duty provided in the applicable subheading + 25%  Decolorizing earths and fuller's earth vs-2508400110
2508.40.01.50 Free  The duty provided in the applicable subheading + 25%  Other vs-2508400120
2508.50.00.00 Free  The duty provided in the applicable subheading + 25%  Andalusite, kyanite and sillimanite vs-2508400150
2508.60.00.00 Free  The duty provided in the applicable subheading + 25%  Mullite vs-2508500000
2508.70.00.00 Free  The duty provided in the applicable subheading + 25%  Chamotte or dinas earth vs-2508600000
2509.00     Chalk: vs-2508700000
2509.00.10.00 Free  The duty provided in the applicable subheading + 25%  Crude vs-250900
2509.00.20.00 Free  The duty provided in the applicable subheading + 25%  Other vs-2509001000
2510     Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk: vs-2509002000
2510.10.00.00 Free  The duty provided in the applicable subheading + 25%  Unground vs-2510
2510.20.00.00 Free  The duty provided in the applicable subheading + 25%  Ground vs-2510100000
2511     Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816: vs-2510200000