HTS heading 6903: Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other

Heading 6903 of the US Harmonized Tariff Schedule covers 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. Below: every rated tariff line in it with its general duty rate, Section 301 China status and exclusions, then a page per line with a free duty calculator.

Official USITC HTS, 2026HTSRev22 · check on hts.usitc.gov

Heading 6903 at a glance

• 3 rated tariff lines; 3 duty-free at the general (MFN) rate.
• Section 301 (products of China): 3 of 3 lines on a list in effect (List 3).

Goods named in this heading (official line texts): Containing by weight more than 50 percent of free carbon, Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of al….

Subheadings (6-digit)

• 6903.10: Containing by weight more than 50 percent of free carbon (1 line)
• 6903.20: Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of al… (1 line)
• 6903.90: Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzle…: Other (1 line)

All tariff lines in heading 6903

All of chapter 69 · Chapter 69 rate summary · HTS lookup

General information from the official US Harmonized Tariff Schedule (USITC) and USTR Section 301 notices in HTS Chapter 99; not legal or customs advice. Classification is decided by CBP; confirm with a licensed customs broker or a CBP binding ruling.

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