Product classification
HS code for Industrial sealant: 3214.90
Mastics, n.e.c. in heading no. 3214.
Classification of industrial sealant under HS 3214.90
Industrial sealants are classified under HS code 3214.90, which covers mastics and other surfacing preparations. This classification is determined by the product's function as a filler or sealer for joints, cracks, or surfaces. Unlike adhesives, which are designed primarily to bond two surfaces together, sealants are formulated to prevent the passage of fluids or air through gaps. Heading 3214 includes non-refractory preparations that are used to seal or surface structures, making it the appropriate category for most industrial-grade caulks and jointing compounds used in construction and manufacturing.
- Covers
- Silicone-based industrial sealants
- Polyurethane joint sealants
- Acrylic caulking compounds
- Non-refractory masonry sealants
- Industrial resin mastics
- Glaziers' putty for industrial window installation
- Also under 3214.90
- SikaFlex-221
- GE Silicone II
- Loctite PL Premium
- Tremco Tremflex 834
- DAP Dynaflex 230
Codes often confused with 3214.90
Common mistake. A frequent misclassification occurs with HS code 3506.91, which covers adhesives based on polymers. If a product is marketed primarily for its bonding strength rather than its sealing properties, it may belong in Chapter 35. Furthermore, HS code 3214.10 is often confused with 3214.90; however, 3214.10 is specifically for painters' fillings and mastics used for similar decorative preparation, whereas 3214.90 covers broader industrial surfacing preparations. Refractory sealants used in high-heat furnaces belong under 3816.00.
Top exporters and importers of HS 321490 (the code used for industrial sealant), 2025
In 2025, the largest exporter of HS 321490 (the code used for industrial sealant) in UN Comtrade data was Germany, with 22% of world exports; the largest importer in UN Comtrade data was Germany, with 4.2% 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 321490, not only industrial sealant.
Top exporters 2025 · share of world exports
- 1 Germany $600M 22% of world exports
- 2 Austria $193M 6.9% of world exports
- 3 United States $190M 6.9% of world exports
World total: $2.8B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $121M 4.2% of world imports
- 2 Netherlands $120M 4.2% of world imports
- 3 France $104M 3.6% of world imports
World total: $2.8B 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 that did not report are estimated from what other countries recorded trading with them. 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 industrial sealant
Brazil classifies industrial sealant under NCM 3214.90.00: HS 3214.90 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about industrial sealant
What is the HS code for Industrial sealant?
The HS code for Industrial sealant is 321490 (Mastics; n.e.c. in heading no. 3214). The HS code for most industrial sealants and mastics is 3214.90.
How do I classify Industrial sealant for customs?
Industrial sealant is classified under HS code 321490 — Mastics; n.e.c. in heading no. 3214. This is a 6-digit subheading level code.
Is industrial glue classified under the same code?
No, industrial glues and prepared adhesives are generally classified under heading 3506, depending on their chemical composition and retail packaging.
Which countries are the top exporters of industrial sealant (HS 321490)?
In 2025, the top exporters of HS 321490 (the code used for industrial sealant) in UN Comtrade data were Germany ($600M, 22% of world exports), Austria ($193M) and the United States ($190M). World exports came to about $2.8B, 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 industrial sealant (HS 321490)?
In 2025, the top importers of HS 321490 (the code used for industrial sealant) in UN Comtrade data were Germany ($121M, 4.2% of world imports), the Netherlands ($120M) and France ($104M). World imports came to about $2.8B, 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 Industrial sealant the same in all countries?
The base HS code 321490 for Industrial sealant 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 industrial sealant in Brazil?
In Brazil, industrial sealant (HS 321490) is classified under NCM 3214.90.00.