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SITCSection 7
U.S. imports of electrical insulators of materials other than glass or ceramics (SITC 77324) totaled $25.6M in April 2026, traded with 38 countries.
Importers of Electrical Insulators of Materials Other Than Glass or Ceramics paid $3.0M in duties in April 2026 — an effective duty rate of 18% on $17.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPolymer and composite electrical insulators — typically made from silicone rubber, EPDM, or fiber-reinforced resin — have gained significant market share in transmission and distribution applications because of their lighter weight, superior performance in contaminated environments, and resistance to vandalism compared with glass or porcelain. The material composition (silicone vs. EPDM housing, fiberglass rod core) is the critical specification for both performance and classification under this residual SITC heading. Aging behavior and end-of-life inspection protocols are active areas of utility engineering concern, since polymer insulators do not fail as visibly as glass.
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Classification is determined by the primary material of the insulating body, not its appearance. A composite insulator with a fiberglass-reinforced polymer (FRP) rod and silicone rubber housing is classified under the 'materials other than glass or ceramics' heading regardless of its shape or function. Importers should ensure that technical datasheets clearly identify the housing and core materials to support correct classification.
Silicone rubber housings are preferred in heavily polluted or coastal environments because they maintain hydrophobicity over time, reducing leakage current. However, UV degradation, tracking, and erosion are long-term concerns. IEC 62217 and IEEE 1523 provide guidance on aging evaluation. Buyers sourcing from new suppliers often require accelerated aging test data and field-service references before approving a product for utility-scale deployment.
Monthly import values over time
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