NOW FOR USA HTS Harmonized Tariff Schedule (2023 HTSA Revision 5)
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Harmonized Tariff Schedule (2023 HTSA Revision 5)

Heading Duty(general) Duty(china) Article Description
6901.00.00.00 Free  The duty provided in the applicable subheading + 25%  Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths
6902     Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths:
6902.10     Containing by weight, singly or together, more than 50 percent of the elements magnesium, calcium or chromium, expressed as MgO, CaO or Cr2O3:
6902.10.10.00 Free  The duty provided in the applicable subheading + 25%  Magnesite bricks
6902.10.50.00 Free  The duty provided in the applicable subheading + 25%  Other
6902.20     Containing by weight more than 50 percent of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products:
6902.20.10 Free  The duty provided in the applicable subheading + 25%  Bricks
6902.20.10.10 Free  The duty provided in the applicable subheading + 25%  Alumina
6902.20.10.20 Free  The duty provided in the applicable subheading + 25%  Other
6902.20.50 Free  The duty provided in the applicable subheading + 25%  Other
6902.20.50.10 Free  The duty provided in the applicable subheading + 25%  Alumina
6902.20.50.20 Free  The duty provided in the applicable subheading + 25%  Other
6902.90     Other:
6902.90.10 Free  The duty provided in the applicable subheading + 25%  Bricks
6902.90.10.10 Free  The duty provided in the applicable subheading + 25%  Clay
6902.90.10.20 Free  The duty provided in the applicable subheading + 25%  Other
6902.90.50 Free  The duty provided in the applicable subheading + 25%  Other
6902.90.50.10 Free  The duty provided in the applicable subheading + 25%  Clay
6902.90.50.20 Free  The duty provided in the applicable subheading + 25%  Other
6903     Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths: