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SITCSection 7
U.S. imports of electrical insulators of ceramics (SITC 77323) totaled $17.2M in April 2026, traded with 31 countries.
Importers of Electrical Insulators of Ceramics paid $3.8M in duties in April 2026 — an effective duty rate of 26% on $14.7M in dutiable value, based on actual customs collections rather than the published tariff schedule. Electrical Insulators of Ceramics imports of $17.2M in April 2026 ran 21% above the year-to-date monthly average of $14.2M.
Last updated: April 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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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.
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Monthly import values over time