U.S. imports of Electrical Insulators of Ceramics (SITC 77323) totaled $19.9M in August 2026, imported from 36 countries.
Importers of Electrical Insulators of Ceramics paid $5.5M in duties in August 2026, an average duty rate of 27.86% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Electrical Insulators of Ceramics imports of $19.9M in August 2026 ran 22% above the year-to-date monthly average of $16.3M.
Last updated: August 2026 dataCeramic (porcelain) electrical insulators have served power transmission and distribution networks for over a century, valued for their mechanical strength, thermal stability, and long service life under high-voltage conditions. Porcelain insulators are manufactured to IEC or ANSI standards specifying wet-flashover voltage, mechanical failing load, and creepage distance — parameters that procurement engineers use to match insulators to line voltage and environmental pollution levels. Production is concentrated in countries with established ceramics industries, and import volumes tend to track utility capital expenditure cycles.
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736 import shipments a month
Ceramic insulators are specified by their rated mechanical load, dry and wet flashover voltage, and creepage distance. IEC 60305 and ANSI C29 series standards define test methods and performance classes. Utilities typically specify the pollution severity class (light, medium, heavy, or very heavy) based on the installation environment, which determines the required creepage distance per kilovolt.
Standard import documentation includes a commercial invoice with full material description (porcelain/ceramic), country of origin, and unit values; a packing list; and a bill of lading. For utility-grade insulators, buyers often require third-party test certificates confirming compliance with IEC or ANSI standards. No mandatory admissibility agency review applies, but importers should confirm whether any antidumping orders cover the specific country of origin.
Basic heading 343 of 642 in section 7
Basic heading 77323 · $19.9M of $172.0B
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Imports · August 2026
origin
China and India together supply 70% of it. Brazil pays 40.5% duty; Mexico <0.1%.
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.
ImportsExports
Imports
$19.9MYoY · free account
Exports
$5.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $181.4M of Electrical Insulators of Ceramics.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.