Product classification
HS code for Mastic sealant: 3214.90
Mastics, n.e.c. in heading no. 3214.
Classification of mastic sealant under HS 3214.90
Mastic sealants are classified under HS code 3214.90. Chapter 32 covers tanning or dyeing extracts, tannins and their derivatives, dyes, pigments, and other coloring matter, as well as paints and varnishes, putty, and other mastics. Heading 3214 includes glazier's putty, grafting putty, resin cements, caulking compounds, and other mastics, as well as painters' fillings and non-refractory surfacing preparations for facades, indoor walls, floors, ceilings, or the like. Subheading 3214.90 is the residual category for "other" mastics and fillings that are not specifically resin cements or glazier's putty. These products are typically used to seal joints, cracks, or gaps to prevent the passage of air, water, or other substances. They are characterized by their ability to remain somewhat flexible after application. The classification depends on the chemical composition and the intended application as a filler or sealant rather than a pure adhesive. Under GRI 1, the product is classified based on its function as a mastic or filling preparation. These products are often based on plastics, rubber, or bitumen, but their classification in 3214 is determined by their use in construction and repair for sealing purposes.
- Covers
- Silicone sealants and caulks
- Acrylic joint fillers
- Polyurethane sealants
- Bituminous mastics for roofing
- Non-refractory surfacing preparations
- Plaster-based painters' fillings
- 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. Mastic sealants are frequently misclassified under 3506.91, which covers adhesives based on polymers. While some sealants have adhesive properties, their primary function in heading 3214 is to fill gaps or seal joints. Another common error is using 3214.10, which is specifically for glazier's putty, grafting putty, and resin cements. If the product is a modern synthetic sealant used for general construction, 3214.90 is usually the more appropriate code. It is also sometimes confused with 3824.99 for miscellaneous chemical products, but 3214 is more specific for mastics.
Top exporters and importers of HS 321490 (the code used for mastic sealant), 2025
In 2025, the largest exporter of HS 321490 (the code used for mastic 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 mastic 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 mastic sealant
Brazil classifies mastic 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 mastic sealant
What is the HS code for Mastic sealant?
The HS code for Mastic sealant is 321490 (Mastics; n.e.c. in heading no. 3214). The HS code for mastic sealant is 3214.90, covering other mastics and painters' fillings.
How do I classify Mastic sealant for customs?
Mastic sealant is classified under HS code 321490 — Mastics; n.e.c. in heading no. 3214. This is a 6-digit subheading level code.
Is silicone caulk classified as an adhesive?
While it has adhesive properties, silicone caulk used for sealing is primarily classified under 3214.90 as a mastic rather than under 3506 as an adhesive.
Which countries are the top exporters of mastic sealant (HS 321490)?
In 2025, the top exporters of HS 321490 (the code used for mastic 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 mastic sealant (HS 321490)?
In 2025, the top importers of HS 321490 (the code used for mastic 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 Mastic sealant the same in all countries?
The base HS code 321490 for Mastic 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 mastic sealant in Brazil?
In Brazil, mastic sealant (HS 321490) is classified under NCM 3214.90.00.