U.S. imports of Multiple-Walled Insulating Glass Units (SITC 66492) totaled $33.1M in August 2026, imported from 50 countries.
Importers of Multiple-Walled Insulating Glass Units paid $2.2M in duties in August 2026, an average duty rate of 6.66% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataMultiple-walled insulating glass units (IGUs)—double- or triple-glazed assemblies with hermetically sealed air or gas-filled cavities—are a core component of energy-efficient windows and curtain-wall systems in commercial and residential construction. Performance specifications such as U-factor, solar heat gain coefficient (SHGC), and argon or krypton gas fill distinguish commodity from premium units and affect both pricing and building-code compliance. Antidumping and countervailing duty orders have been applied to IGU imports from certain countries, making scope rulings and accurate country-of-origin declarations essential for importers supplying the construction sector.
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2.6K import shipments a month
Argon is the most common fill gas for standard IGUs, while krypton is used in premium thin-profile units. Gas fill type does not change the SITC or HTS classification of the unit itself, but it is a key specification for building-code compliance (ENERGY STAR, NFRC ratings) and should be documented on product data sheets accompanying the shipment.
Active antidumping or countervailing duty orders on IGUs from specific origins can substantially increase landed cost. Importers should check the current scope of any orders with CBP and the International Trade Commission before committing to a supplier, and should consider requesting a scope ruling if the product's specifications are near the order's definitional boundaries.
Basic heading 178 of 766 in section 6
Basic heading 66492 · $33.1M of $27.0B
Imports · August 2026
origin
Mexico and Germany together supply 57% of it. Turkey pays 16.4% duty; Canada 0.5%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
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ImportsExports
Imports
$33.1MYoY · free account
Exports
$14.1MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $353.2M of Multiple-Walled Insulating Glass Units and exported $166.7M.
Through August 2026. Source: U.S. Census Bureau.