Silicon Dioxide (Amorphous Silica)
Amorphous silicon dioxide, also known as synthetic silica, is a chemically defined inorganic oxygen compound of the nonmetal silicon. It falls under HTS 2811.29.5000 as 'other inorganic oxygen compounds of nonmetals' excluding specified compounds like carbon oxides. Used as a filler in rubber, plastics, and pharmaceuticals.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If naturally occurring silica sand or quartz
Natural silica in silica sands or quartz falls under Chapter 25 as natural minerals, not chemically defined compounds.
If mixed with organic binders for industrial use
Silica preparations with organic additives become chemical preparations under 3824, not pure inorganic compounds.
If silicon dioxide prepared for specific electronic doping
Doped silicon dioxide for electronics may shift to 3818 when cut into wafers or discs.
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Import Tips & Compliance
• Provide Certificate of Analysis (COA) confirming purity and amorphous structure to avoid misclassification as quartz
• Ensure proper labeling as non-hazardous if particle size exceeds respirable limits; comply with TSCA registration
• Verify bulk packaging doesn't trigger 3824 classification for mixtures
Related Products under HTS 2811.29.50.00
Boron Trioxide (Boric Oxide)
Boron trioxide (B₂O₃) is a pure inorganic oxygen compound of the nonmetal boron, used in glass manufacturing and as a flux. Classified in HTS 2811.29.5000 as an 'other' inorganic oxygen compound of nonmetals per Chapter 28 notes. It appears as a colorless glassy solid.
Phosphorus Pentoxide
Phosphorus pentoxide (P₄O₁₀), also called phosphoric anhydride, is a white powder used as a desiccant and dehydrating agent. It qualifies under HTS 2811.29.5000 as an other inorganic oxygen compound of the nonmetal phosphorus. Highly reactive with water to form phosphoric acid.
Arsenic Trioxide
Arsenic trioxide (As₂O₃), a white powder used in pharmaceuticals and glass production, is an inorganic oxygen compound of nonmetal arsenic. Falls under HTS 2811.29.5000 per chapter definitions excluding specified compounds. Highly toxic, requiring special handling.
Antimony Trioxide
Antimony trioxide (Sb₂O₃) serves as a flame retardant in plastics and a catalyst in PET production. Classified as an other inorganic oxygen compound of nonmetal antimony under HTS 2811.29.5000. Fine white powder form.
Tellurium Dioxide
Tellurium dioxide (TeO₂) used in optical glass and electroceramics is an inorganic oxygen compound of nonmetal tellurium. Fits HTS 2811.29.5000 as other such compounds. Available as white crystalline powder.
Selenium Dioxide
Selenium dioxide (SeO₂) employed in organic synthesis and glass coloring is a volatile inorganic oxygen compound of nonmetal selenium. Classified under HTS 2811.29.5000 excluding doped forms. White crystalline solid.