Silica Glass Microspheres (Fused Quartz)
Synthetic fused silica glass microspheres (1-20 microns) for semiconductor polishing slurries. HTS 7018.20.00.00 includes fused quartz microspheres ≤1 mm per chapter note defining 'glass' inclusively.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If silicon dioxide powder
Amorphous silica powder not meeting precise microsphere criteria classifies as chemical rather than glass article.
If for porcelain/ceramic production
Silica microspheres used solely as ceramic raw material may classify under ceramic articles.
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Import Tips & Compliance
• Certify SiO2 purity level; use anti-static packaging for cleanroom compatibility; segregate from leaded glass types
Related Products under HTS 7018.20.00.00
Soda-Lime Glass Microspheres 50-100 Microns
These solid soda-lime glass microspheres, with diameters between 50 and 100 microns, are used as fillers in paints and additives in cosmetics. They fall under HTS 7018.20.00.00 because they are glass microspheres not exceeding 1 mm in diameter, distinct from imitation jewelry or ornaments.
Borosilicate Hollow Glass Microspheres Type A
Hollow borosilicate glass microspheres averaging 30-120 microns in diameter serve as lightweight fillers in syntactic foams for aerospace composites. Classified under HTS 7018.20.00.00 as glass microspheres ≤1 mm, excluding imitation pearls or lamp-worked ornaments.
Lead Glass Microspheres for Radiation Shielding
High-density lead glass microspheres (20-200 microns) with ≥24% PbO content used in medical radiation shielding compounds. HTS 7018.20.00.00 applies to these microspheres ≤1 mm diameter, separate from prosthetic glass eyes or statuettes.
Conductive Silver-Coated Glass Microspheres
Glass microspheres (40-80 microns) with vacuum-deposited silver coating for conductive adhesives and electronics. Falls under HTS 7018.20.00.00 as base glass microspheres ≤1 mm, with coating not affecting primary glass classification per chapter notes.
Fluorescent Glass Microspheres for Tracers
Polystyrene-core glass microspheres (10-50 microns) with fluorescent doping for flow visualization in scientific research. HTS 7018.20.00.00 covers these ≤1 mm glass microspheres, excluding imitation semiprecious stones.
High-Index Glass Microspheres for Reflective Paint
Spherical glass microspheres (100-300 microns) with refractive index >1.9 for retroreflective highway markings. Classified HTS 7018.20.00.00 as microspheres ≤1 mm, distinct from absorbent/reflecting coated sheets in heading 7005.