Glass microspheres not exceeding 1 mm in diameter
Glass beads, imitation pearls, imitation precious or semi-precious stones and similar glass smallwares, and articles thereof other than imitation jewellery; glass eyes other than prosthetic articles; statuettes and other ornaments of lamp-worked glass, other than imitation jewellery; glass microspheres not exceeding 1 mm in diameter. > Glass microspheres not exceeding 1 mm in diameter > Glass microspheres not exceeding 1 mm in diameter
Duty Rate (from China)
Products classified under Tariff item 7018.20.00
Aluminosilicate Glass Microspheres for Shot Peening
Precision-graded aluminosilicate glass microspheres ranging from 45 to 90 microns in diameter, used for shot peening aerospace turbine blades. These microspheres are under 1 mm in diameter and are not worked beyond the annealing stage, making them classifiable under tariff item 7018.20.00.
Borosilicate Hollow Glass Microspheres Type A
Hollow borosilicate glass microspheres averaging 30 to 120 microns in diameter, used as lightweight fillers in syntactic foams for aerospace composites. These microspheres are under 1 mm and are not further worked, qualifying for tariff item 7018.20.00.
Conductive Silver-Coated Glass Microspheres
Glass microspheres with a vacuum-deposited silver coating, ranging from 40 to 80 microns, used in conductive adhesives and electronics. The silver coating does not change the primary glass microsphere classification, and the diameter is under 1 mm, so they fall under tariff item 7018.20.00.
Expandable Glass Microspheres K15/250
Pre-expanded borosilicate glass microspheres ranging from 10 to 250 microns in their delivered state, used as fillers in thermoplastics. These microspheres are under 1 mm in diameter and are not further worked, making them classifiable under tariff item 7018.20.00.
Fluorescent Glass Microspheres for Tracers
Polystyrene-core glass microspheres with fluorescent doping, ranging from 10 to 50 microns, used for flow visualization in scientific research. Despite the polystyrene core, the outer glass layer and the under-1-mm diameter place them under tariff item 7018.20.00.
High-Index Glass Microspheres for Reflective Paint
Spherical glass microspheres with a refractive index greater than 1.9, ranging from 100 to 300 microns, used for retroreflective highway markings. These microspheres are under 1 mm in diameter and are not coated with a reflecting layer as defined in chapter note 2, so they fall under tariff item 7018.20.00.
Lead Glass Microspheres for Radiation Shielding
High-density lead glass microspheres with a lead monoxide content of at least 24%, ranging from 20 to 200 microns, used in medical radiation shielding compounds. These microspheres are under 1 mm in diameter and are not prosthetic articles, so they fall under tariff item 7018.20.00.
Polished Soda Lime Glass Ballotini 3M S22
Precision-polished soda lime glass microspheres, grade S22, approximately 220 microns in diameter, used as grinding media. Polishing before annealing does not constitute 'worked' glass per chapter note 2, and the diameter is under 1 mm, so they fall under tariff item 7018.20.00.
Silica Glass Microspheres (Fused Quartz)
Synthetic fused silica glass microspheres ranging from 1 to 20 microns, used in semiconductor polishing slurries. Per chapter note 5, 'glass' includes fused quartz and other fused silica, and the diameter is under 1 mm, so they fall under tariff item 7018.20.00.
Soda-Lime Glass Microspheres 50-100 Microns
Solid soda-lime glass microspheres with diameters between 50 and 100 microns, used as fillers in paints and additives in cosmetics. These microspheres are under 1 mm in diameter and are not further worked, making them classifiable under tariff item 7018.20.00.