U.S. imports of Electrical Insulators of Glass (SITC 77322) totaled $4.3M in August 2026, imported from 16 countries.
Importers of Electrical Insulators of Glass paid $1.3M in duties in August 2026, an average duty rate of 30.36% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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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52 import shipments a month
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.
Basic heading 494 of 642 in section 7
Basic heading 77322 · $4.3M of $172.0B
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Imports · August 2026
origin
China and Italy together supply 97% of it. China pays 40.4% duty; Italy 10.0%.
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
$4.3MYoY · free account
Exports
$490KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $57.9M of Electrical Insulators of Glass.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.