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SITCSection 6
U.S. imports of clock and watch glasses, unworked spectacle glass, and hollow glass spheres (SITC 66494) totaled $486K in April 2026, traded with 9 countries.
Importers of Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres paid $51K in duties in April 2026 — an effective duty rate of 11% on $470K in dutiable value, based on actual customs collections rather than the published tariff schedule. Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres imports of $486K in April 2026 ran 24% below the year-to-date monthly average of $643K.
Last updated: April 2026 dataA technically diverse grouping united by the absence of optical working, this heading covers protective cover glasses for timepieces, glass blanks for spectacle lenses that have not yet been ground or polished to a prescription, and hollow glass microspheres and sphere segments used in industrial applications such as reflective road markings and syntactic foam. The distinction between optically worked and unworked spectacle glass is the critical classification boundary: once a lens blank is ground to a prescription or coated for optical performance, it moves to the optics headings. Hollow glass microspheres are also used as lightweight fillers in aerospace composites, giving this heading an unexpectedly broad industrial footprint.
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Optical working—grinding, polishing, or coating a blank to achieve a specific refractive correction or optical function—is the threshold. Unground, unpolished glass blanks cut to shape for spectacle frames remain here; once the surface is worked to a prescription or anti-reflective coating is applied for optical purposes, the product reclassifies under the optical elements headings.
Hollow glass microspheres serve as lightweight fillers in syntactic foams, aerospace composites, and reflective pavement markings. End-use does not change their classification at import; they are classified by their physical form as hollow glass spheres within this heading regardless of the downstream application.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| SWITZERLAND | $418K | $5K | -$413K |
| CHINA | $68K | $97K | +$29K |
| INDIA | -- | $95K | +$95K |
| PANAMA | -- | $36K | +$36K |
| HONG KONG | -- | $34K | +$34K |
Monthly import values over time
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