Silicone Sealant / Caulk — HS Code
Glaziers' putty, grafting putty, resin cements, caulking compounds and other mastics
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HS Code
3214 — Glaziers' putty, grafting putty, resin cements, caulking compounds and other mastics
Classification Context
Chapter
Chapter 32 — Paints, varnishes, putty and related products
Heading
3214 — Glaziers' putty, grafting putty, resin cements, caulking compounds and other mastics
Applicable Rule
GRI 1 — silicone sealants are caulking compounds classified under 3214.10
Prior Rulings
EU — EBTI (Binding Tariff Information)
Search EU EBTI databaseUS — CBP CROSS Ruling Database
Search US CBP CROSS rulingsUK — HMRC Trade Tariff
View UK Trade Tariff commodityClassification Notes
Silicone sealant, bathroom sealant, and window sealant in cartridges are classified under 3214.10 as mastics or caulking compounds. Polyurethane foam sealant (expanding foam) is 3214.10 regardless of the foam chemistry. Silicone rubber in bulk form is 3910 (polysiloxanes). The retail presentation in a cartridge does not change the classification. Fire-rated intumescent sealants follow the same heading. The colour (white, grey, transparent, black) and intended substrate (sanitary, glazing, general purpose) do not affect the HS code.
MFN Duty Rates by Market
European Union
3214.10.10
EU Combined Nomenclature (CN) rate — applies to all 27 EU member states
United States
3214.10.10
US Harmonized Tariff Schedule (HTS) MFN rate — Section 301 tariffs may add to China-origin goods
United Kingdom
3214.10.10
UK Global Tariff (UKGT) — post-Brexit tariff schedule, independent of EU CN
Official Sources & References
WCO HS Nomenclature
World Customs Organisation — the international standard behind all HS codes
wcoomd.org
EU TARIC Database
European Commission integrated tariff — EU Combined Nomenclature (CN) rates
ec.europa.eu
US HTS Schedule (USITC)
United States International Trade Commission — official US Harmonized Tariff Schedule
hts.usitc.gov
UK Global Tariff (HMRC)
His Majesty's Revenue and Customs — UK Trade Tariff post-Brexit
trade-tariff.service.gov.uk
Disclaimer: Duty rates shown are MFN (Most-Favoured-Nation) base rates sourced from live tariff database and verified April 2026. Actual duties may differ based on country of origin, applicable trade agreements (e.g. GSP, CETA, UK-EU TCA), anti-dumping measures, or changes to tariff schedules. Always verify with the official tariff database of the importing country before making customs declarations.
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