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SITCSection 7
U.S. imports of electrical insulators of glass (SITC 77322) totaled $3.3M in April 2026, traded with 13 countries.
Importers of Electrical Insulators of Glass paid $974K in duties in April 2026 — an effective duty rate of 29% on $3.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Electrical Insulators of Glass imports of $3.3M in April 2026 ran 14% below the year-to-date monthly average of $3.9M.
Last updated: April 2026 dataGlass electrical insulators are used primarily in overhead transmission and distribution lines, where their dielectric strength and resistance to weathering make them a durable choice for high-voltage applications. The material composition — specifically tempered or toughened glass — is a key specification that differentiates these from porcelain or polymer alternatives and affects both performance ratings and classification. Utility procurement cycles and grid-expansion projects in emerging markets drive demand patterns for this commodity.
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The material of construction is the primary classification criterion: glass insulators fall under their own SITC heading (77322), while ceramic or porcelain insulators are classified separately (77323). Composite or polymer insulators fall under yet another heading. Importers should confirm the material composition on commercial invoices and technical datasheets to avoid misclassification.
Key specifications include the mechanical load rating (tensile or cantilever strength), the creepage distance for pollution-level compliance, and whether the glass is thermally toughened (which causes the insulator to shatter into small pieces rather than crack, aiding fault detection). IEC and ANSI standards govern these ratings, and utility procurement contracts typically specify the applicable standard.
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Monthly import values over time