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SITCSection 7
U.S. imports of insulating fittings for electrical machines — other materials (nes) (SITC 77329) totaled $17.3M in April 2026, traded with 33 countries.
Importers of Insulating Fittings for Electrical Machines — Other Materials (NES) paid $3.6M in duties in April 2026 — an effective duty rate of 30% on $12.2M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataResidual insulating fittings made from materials other than ceramics or plastics — including mica composites, vulcanized fiber, epoxy-glass laminates (such as FR4 or G10), and similar engineered dielectrics — serve specialized roles in high-temperature motor windings, transformer coil supports, and precision switchgear where neither standard ceramics nor commodity plastics meet the thermal or mechanical requirements. The 'not elsewhere specified' scope of this heading means correct classification requires ruling out the ceramic (77326) and plastic (77328) headings first. Epoxy-glass laminates in particular are a widely traded subcategory used extensively in printed circuit board and power electronics manufacturing.
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Common materials include mica-based composites (micanite, mica paper laminates), vulcanized fiber, epoxy-glass laminates (FR4, G10, G11), and fish paper. These materials are chosen for applications requiring high dielectric strength at elevated temperatures — such as slot liners in electric motors, coil end-turn supports in transformers, or arc barriers in switchgear — where plastics would soften and ceramics would be too brittle or heavy.
Importers should retain material composition certificates or technical datasheets confirming that the fitting's primary insulating material is neither ceramic nor plastic. For epoxy-glass laminates, a laminate grade designation (e.g., NEMA FR4, G10) and resin content specification serve this purpose. For mica composites, the mica content percentage and binder type should be documented. CBP may request this documentation during a tariff classification review.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $3.3M | $6.2M | +$3.0M |
| CANADA | $2.8M | $860K | -$2.0M |
| KOREA, SOUTH | $1.7M | $1.7M | -$41K |
| TRINIDAD AND TOBAGO | -- | $3.1M | +$3.1M |
| CHINA | $2.6M | $445K | -$2.1M |
Monthly import values over time