Product classification
HS code for Caulk: 3214.10
Mastics, painters' fillings.
Classification of caulk under HS 3214.10
Caulk is classified under HS code 3214.10, which covers mastics, painters' fillings, and similar non-refractory surfacing preparations. This classification is appropriate because caulk is a material used to seal joints or seams against leakage in various structures and piping. These products are typically based on polymers like silicone, polyurethane, or acrylic resins, mixed with fillers and pigments. The primary function is to fill gaps and provide a flexible or rigid seal, which aligns perfectly with the definition of mastics and painters' fillings in the Explanatory Notes to Chapter 32. Whether the caulk is used for residential windows or industrial piping, its chemical composition as a filler or mastic dictates its placement in this specific subheading.
- Covers
- Silicone sealants and caulks
- Acrylic latex caulk
- Butyl rubber caulk
- Glazier's putty
- Resin-based joint fillers
- 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. Frequently confused with 3506.91 (adhesives based on polymers) because some caulks have adhesive properties. However, if the primary purpose is filling or sealing rather than bonding two surfaces, 3214.10 takes precedence. It is also sometimes misclassified under 3214.90, which is reserved for other surfacing preparations like non-refractory plastering materials.
Top exporters and importers of HS 321410 (the code used for caulk), 2025
In 2025, the largest exporter of HS 321410 (the code used for caulk) 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 caulk.
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 caulk
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 caulk
What is the HS code for Caulk?
The HS code for Caulk is 321410 (Mastics; painters' fillings). The standard HS code for caulk and similar mastics is 3214.10.
How do I classify Caulk for customs?
Caulk is classified under HS code 321410 — Mastics; painters' fillings. This is a 6-digit subheading level code.
Is silicone sealant always 3214.10?
Yes, if the silicone is formulated as a mastic or filler for sealing gaps, it falls under 3214.10. If it is a pure silicone polymer in primary form, it would fall under Chapter 39.
Which countries are the top exporters of caulk (HS 321410)?
In 2025, the top exporters of HS 321410 (the code used for caulk) 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 caulk (HS 321410)?
In 2025, the top importers of HS 321410 (the code used for caulk) 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 Caulk the same in all countries?
The base HS code 321410 for Caulk 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 caulk in Brazil?
Brazil splits HS 321410 into 2 NCM codes, so the right one for caulk depends on the product's details: 3214.10.10 (Glaziers' putty, resin cements and other mastics), 3214.10.20 (Painters' fillings).