Product classification
HS code for Chimney liners: 6905.90
Ceramic chimney-pots, cowls, chimney liners, architectural ornaments and other constructional goods (excluding roofing tiles).
Classification of chimney liners under HS 6905.90
Chimney liners made of ceramic materials are classified under HS code 6905.90. Chapter 69 covers ceramic products, which are defined as articles formed by shaping and then firing inorganic, non-metallic materials. Heading 6905 includes roofing tiles, chimney-pots, cowls, chimney liners, architectural ornaments, and other constructional goods. While 6905.10 is dedicated specifically to roofing tiles, 6905.90 serves as the residual category for other constructional ceramic items, including liners. These liners are essential components in chimney construction, designed to contain the products of combustion and protect the chimney walls from heat and corrosion. The classification is based on the material composition (ceramic) and the intended use in construction. If the liner is made of a different material, such as metal or concrete, it would fall under a completely different chapter of the Harmonized System.
- Covers
- Ceramic flue liners
- Clay chimney liners
- Refractory ceramic chimney liners
- Ceramic chimney pots and cowls
- Also under 6905.90
- H.G. Matthews chimney pots
- custom ceramic architectural elements
- traditional terracotta finials
Codes often confused with 6905.90
Common mistake. Chimney liners are often misclassified based on their material. For instance, stainless steel chimney liners are classified under heading 7308 as structures of iron or steel. Flexible chimney liners made of base metal fall under 8307. Additionally, if the liners are made of concrete or artificial stone, they are classified under heading 6810. Confusion can also arise with refractory bricks (6902), but chimney liners are specifically named in the 6905 heading.
Top exporters and importers of HS 690590 (the code used for chimney liners), 2025
In 2025, the largest exporter of HS 690590 (the code used for chimney liners) in UN Comtrade data was China, with 34% of world exports; the largest importer in UN Comtrade data was Saudi Arabia, with 13% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 690590, not only chimney liners.
Top exporters 2025 · share of world exports
- 1 China $29M 34% of world exports
- 2 Germany $16M 19% of world exports
- 3 United Arab Emirates* ~$6.6M 7.9% of world exports · partner records ↗
World total: $84M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Saudi Arabia $11M 13% of world imports
- 2 Poland $7.5M 9.4% of world imports
- 3 Austria $5.7M 7.1% of world imports
World total: $79M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for chimney liners
Brazil classifies chimney liners under NCM 6905.90.00: HS 6905.90 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about chimney liners
What is the HS code for Chimney liners?
The HS code for Chimney liners is 690590 (Ceramic chimney-pots, cowls, chimney liners, architectural ornaments and other constructional goods (excluding roofing tiles)). The HS code for ceramic chimney liners is 6905.90, which covers various ceramic constructional goods excluding roofing tiles.
How do I classify Chimney liners for customs?
Chimney liners is classified under HS code 690590 — Ceramic chimney-pots, cowls, chimney liners, architectural ornaments and other constructional goods (excluding roofing tiles). This is a 6-digit subheading level code.
Are industrial furnace liners included here?
No, liners specifically designed for industrial furnaces or kilns are usually classified as refractory goods under heading 6902, as they are designed to withstand much higher temperatures than standard domestic chimney liners.
Which countries are the top exporters of chimney liners (HS 690590)?
In 2025, the top exporters of HS 690590 (the code used for chimney liners) in UN Comtrade data were China ($29M, 34% of world exports), Germany ($16M) and the United Arab Emirates (about $6.6M). World exports came to about $84M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of chimney liners (HS 690590)?
In 2025, the top importers of HS 690590 (the code used for chimney liners) in UN Comtrade data were Saudi Arabia ($11M, 13% of world imports), Poland ($7.5M) and Austria ($5.7M). World imports came to about $79M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Chimney liners the same in all countries?
The base HS code 690590 for Chimney liners is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for chimney liners in Brazil?
In Brazil, chimney liners (HS 690590) is classified under NCM 6905.90.00.