What are refractory ceramic goods?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
HS-4 · Heading
6903 — Ceramic goods; (e.g. retorts, crucibles, muffles, nozzles, plugs, supports cupels, tubes, pipes, sheaths, rods and slide gates) excluding those of siliceous fossil meals or of similar siliceous earths
Chapter 69: Ceramic products
Plain-language overview
Use HS-4 6903 when importing ceramic goods such as retorts, crucibles, or tubes. These items are essential in various industrial processes, particularly in high-temperature applications. If your shipment includes refractory ceramics, you’ll need to determine the specific subheading based on the material composition.
When deciding between the HS-6 lines, consider the carbon and alumina content in your ceramic goods. For example, if your product contains more than 50% free carbon, classify it under 690310. If it has over 50% alumina, then 690320 is the correct choice. This distinction is crucial for compliance and accurate duty assessment.
If your ceramic goods don't fit neatly into the first two categories, check 690390. This line covers refractory ceramics that don't meet the specific criteria of the other subheadings. It's important to review the material composition and ensure it aligns with the definitions provided.
Keywords & topics
Useful terms traders and brokers use for this HS-4 heading.
ceramic goods import · refractory ceramics classification · HS-4 6903 · retorts and crucibles · alumina content ceramics · free carbon ceramics · industrial ceramic products · duty classification ceramics · ceramic tubes HS-6 · high-temperature ceramic goods
Examples
Drawn from the official tariff wording for this HS-4 heading. Always confirm against your published schedule and legal notes.
- Refractory crucibles used in metal casting
- Ceramic tubes for high-temperature furnaces
- Nozzles made from refractory materials
- Support rods for industrial kilns
- Slide gates in ceramic processing
- Muffles for laboratory applications
- Plugs for sealing high-temperature vessels
Common questions
Frequent classification questions with short practical guidance.
How to classify ceramic imports?
Write down material, use, and product form first, then compare nearby lines before you lock the code.
What is the difference between HS-6 690310 and 690320?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Which subheading for ceramic tubes?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
How to determine carbon content in ceramics?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
What does n.e.c. mean in HS-4 6903?
Use n.e.c. only when you have ruled out every more specific line in the same section.
Related topics
Common real-world topics that come up during code comparison.
how to classify refractory ceramic goods
Use this topic to narrow your shortlist, then validate the final code against legal wording.
importing ceramic tubes and pipes
Check the exact product specs and destination-country tariff notes before finalizing the code.
difference between alumina and carbon ceramics
Compare adjacent HS lines and pick the one that matches material, function, and product form most closely.
what to do if ceramics don't fit HS-6 criteria
Use this topic to narrow your shortlist, then validate the final code against legal wording.
guidelines for importing ceramic crucibles
Check the exact product specs and destination-country tariff notes before finalizing the code.
understanding HS-4 6903 for importers
Check the exact product specs and destination-country tariff notes before finalizing the code.
how to assess ceramic goods for customs
Check the exact product specs and destination-country tariff notes before finalizing the code.
refractory ceramics and their applications
Use this topic to narrow your shortlist, then validate the final code against legal wording.
Questions & answers
For orientation only—the binding text is your national tariff and the WCO nomenclature your country uses.
- What types of ceramic goods fall under HS-4 6903?
- HS-4 6903 includes items like retorts, crucibles, tubes, and nozzles, specifically designed for high-temperature applications.
- How do I determine the correct HS-6 subheading for my ceramic product?
- Check the material composition: use **690310** for over 50% free carbon, **690320** for over 50% alumina, and **690390** for other refractory ceramics.
- What does 'n.e.c.' mean in the context of HS-6 690390?
- 'N.e.c.' stands for 'not elsewhere classified,' indicating that these ceramics do not fit into the specified categories of the other subheadings.
- Are there any specific packaging requirements for importing ceramic goods?
- While there are no specific packaging requirements for HS-4 6903, ensure that goods are well-protected to prevent damage during transport.
- What should I do if my ceramic goods contain a mix of materials?
- Analyze the predominant material content to determine the appropriate HS-6 subheading for classification.
Continue classification
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Heading-browse mode uses HS-6 690300 (first line of this block).
HS-6 subheadings (3)
- 690310Refractory ceramic goods; containing, by weight, more than 50% of free carbon, excluding those of siliceous fossil meals or similar earths
- 690320Refractory ceramic goods; containing by weight more than 50% of alumina or of a mixture or compound of alumina and of silica, excluding those of siliceous fossil meals or similar earths
- 690390Refractory ceramic goods; composition of which n.e.c. in heading no. 6903, other than those of siliceous fossil meals or similar earths