HS code 6903.90: 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
Last updated
Key facts
- HS code
- 6903.90
- 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
- Chapter
- 69: Ceramic products
- Edition
- HS2022
- Duty in the United States
- See its 2 lines
Summary
HS code 6903.90 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, other than those classified in 6903.10 and 6903.20. It sits in heading 69.03 (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) in chapter 69 (ceramic products). Other goods of heading 69.03 are classified under 6903.10 (containing by weight more than 50 % of free carbon) or 6903.20 (containing by weight more than 50 % of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)). National tariff lines under 6903.90 are live on border.bot for the United States (2 lines, also used by 1 other country).
What this code covers
HS code 6903.90 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, other than those classified in 6903.10 and 6903.20.
The legal text of the subheading is “Other”, in HS2022.
What it doesn’t cover
Other goods of heading 69.03 are classified under 6903.10 (containing by weight more than 50 % of free carbon) or 6903.20 (containing by weight more than 50 % of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)).
How it is structured
6903.90 is a six-digit subheading. Its first two digits, 69, are the chapter; the first four, 6903, are heading 69.03; the last two, 90, identify the subheading within the heading.
Countries add their own digits after these six for their national tariff lines.
In other countries
National tariff lines under 6903.90 are live on border.bot for the United States (2 lines, also used by 1 other country).
- United States2 lines, used by 1 other country
Frequently asked questions
What does HS code 6903.90 cover?
HS code 6903.90 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, other than those classified in 6903.10 and 6903.20.
Which heading and chapter is HS code 6903.90 in?
HS code 6903.90 is in heading 69.03 (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) in chapter 69 (ceramic products).
Where are goods of heading 69.03 classified when 6903.90 doesn’t fit?
Other goods of heading 69.03 are classified under 6903.10 (containing by weight more than 50 % of free carbon) or 6903.20 (containing by weight more than 50 % of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)).
Which countries’ tariffs list national lines under HS code 6903.90?
National tariff lines under 6903.90 are live on border.bot for the United States (2 lines, also used by 1 other country).
Sources and updates
The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.
This page was last updated on 11 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.