Product classification
HS code for Sealant: 3214.10
Mastics, painters' fillings.
Classification of sealant under HS 3214.10
The classification of sealants under HS code 3214.10 is determined by their primary function as mastics or painters' fillings. According to the Explanatory Notes to the Harmonized System, heading 3214 encompasses preparations used for sealing, caulking, or filling gaps to exclude moisture, air, or dust, or to provide a smooth surface for painting. These products are distinct from adhesives classified under heading 3506, as their primary purpose is filling a volume or creating a barrier rather than merely bonding two surfaces together. Sealants in this category are often based on plastics, rubber, or other chemical binders mixed with fillers like calcium carbonate or silica. The classification process involves analyzing the chemical composition to ensure it fits the definition of a mastic. If the product is primarily used for its adhesive properties and is packaged for retail sale in small quantities, it might be scrutinized against Chapter 35, but industrial-grade sealants and caulks used in construction and automotive assembly are firmly rooted in 3214.10. Furthermore, the distinction between a \"mastic\" and a \"filler\" is important; mastics are generally applied to joints or surfaces to remain flexible, while fillers are used to level out irregularities before painting. Both are grouped here because they share similar chemical bases and application methods. Importers must ensure that the technical data sheet (TDS) clearly states the intended use as a sealant or filler to avoid disputes with customs authorities regarding the adhesive content.
- Covers
- Silicone sealants for construction
- Polyurethane caulking compounds
- Acrylic joint fillers
- Glazier's putty for window installation
- Resin cements for industrial sealing
- Painters' fillings for wall repair
- Also under 3214.10
- DAP Alex Plus Caulk
- Red Devil Spackling
- Gorilla Sealant
- Polyfilla
- SikaFlex Sealant
- Loctite PL Premium
Codes often confused with 3214.10
Common mistake. Sealants are frequently misclassified under HS code 3506.91, which covers adhesives based on polymers. The confusion arises because many sealants have adhesive properties. However, if the product's primary function is to fill a gap or seal a joint rather than bond two surfaces, 3214.10 is the correct code. Another common error is using 3208 or 3209 for liquid sealants, which are actually paints or varnishes.
Top exporters and importers of HS 321410 (the code used for sealant), 2025
In 2025, the largest exporter of HS 321410 (the code used for sealant) in UN Comtrade data was Germany, with 22% of world exports; the largest importer in UN Comtrade data was Germany, with 8.0% 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 321410, not only sealant.
Top exporters 2025 · share of world exports
- 1 Germany $1.9B 22% of world exports
- 2 United States $932M 11% of world exports
- 3 Belgium $726M 8.2% of world exports
World total: $8.8B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $706M 8.0% of world imports
- 2 China $588M 6.7% of world imports
- 3 United States $483M 5.5% of world imports
World total: $8.8B 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 codes for sealant
Brazil splits HS 3214.10 into 2 NCM codes. Pick the one that matches your product:
- 3214.10.10Glaziers' putty, resin cements and other mastics
- 3214.10.20Painters' fillings
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about sealant
What is the HS code for Sealant?
The HS code for Sealant is 321410 (Mastics; painters' fillings). The primary HS code for sealants, specifically mastics and painters' fillings, is 3214.10.
How do I classify Sealant for customs?
Sealant is classified under HS code 321410 — Mastics; painters' fillings. This is a 6-digit subheading level code.
Is silicone sealant classified differently than acrylic?
No, both silicone and acrylic sealants are generally classified under 3214.10 as long as they function as mastics or fillers.
Which countries are the top exporters of sealant (HS 321410)?
In 2025, the top exporters of HS 321410 (the code used for sealant) in UN Comtrade data were Germany ($1.9B, 22% of world exports), the United States ($932M) and Belgium ($726M). World exports came to about $8.8B, 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 sealant (HS 321410)?
In 2025, the top importers of HS 321410 (the code used for sealant) in UN Comtrade data were Germany ($706M, 8.0% of world imports), China ($588M) and the United States ($483M). World imports came to about $8.8B, 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 Sealant the same in all countries?
The base HS code 321410 for 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 sealant in Brazil?
Brazil splits HS 321410 into 2 NCM codes, so the right one for sealant depends on the product's details: 3214.10.10 (Glaziers' putty, resin cements and other mastics), 3214.10.20 (Painters' fillings).