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HSChapter 70
U.S. exports of glass microspheres not exceeding 1 mm in diameter (HS 701820) totaled $3.8M in July 2026.
Importers of Glass Microspheres Not Exceeding 1 mm in Diameter paid $639K in duties in July 2026 — an effective duty rate of 23% on $2.8M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataTiny hollow or solid glass spheres measuring 1 mm or less in diameter serve as functional fillers in paints, road-marking retroreflective coatings, syntactic foams, and advanced composite materials. Austria and China are the leading US suppliers under this heading, with Germany, Canada, and Oman also contributing — a geographically diverse supply base that reflects multiple industrial production routes. All US imports are captured under the single tariff line 7018200000, and classification is primarily a size and material question: spheres exceeding 1 mm or made of non-glass materials would fall elsewhere.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
82 shipments/mo
Glass microspheres themselves are generally inert mineral articles and do not typically trigger EPA chemical import restrictions. However, if microspheres are imported pre-mixed into a paint or coating formulation, the finished product may be subject to EPA TSCA review or state VOC regulations. Importers of standalone glass microspheres should confirm the article is not a chemical substance or mixture under TSCA definitions.
The 1 mm diameter ceiling is the defining classification criterion for heading 7018.20. Importers should retain manufacturer specifications or particle size distribution data to demonstrate compliance. Spheres exceeding 1 mm in diameter would not qualify here and could fall under heading 7016.90 (hollow glass spheres for construction) or another provision depending on their form and use. CBP may request technical documentation to verify size at entry.
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Subheading 3 of 3 in heading 7018
Subheading 701820 · $2.9M of $11.7M
ImportsExports
Imports
$2.9MYoY · Pro
Exports
$3.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
United Kingdom and Germany together take 57% of it.
customs district
origin
entry
rate provision · imports
5.0% enters free of duty; the effective duty rate is 22.02%.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7018200000 | Glass Microspheres not Exceeding 1 Mm in Diameter | $2.9M | 22.02% | 95.02% | $639K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7018200000 | Glass Microspheres not Exceeding 1 Mm in Diameter | $3.8M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.