Nano-Silica Particles (20 nm)
Nano-sized amorphous silicon dioxide particles (average 20 nm) produced via sol-gel process for advanced composites. Classified as other silicon dioxide under HTS 2811.22.5000 due to its inorganic oxygen compound nature.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If functionalized with organic groups
Organo-inorganic compounds excluded from Chapter 28 per notes.
If metal-doped for catalysts
Complex compounds with metals go to other subchapters.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include TEM/SEM images and size distribution to prove discrete SiO2 nanoparticles
• Comply with TSCA nano reporting if applicable; declare as pure compound
Related Products under HTS 2811.22.50.00
Precipitated Silica Powder
Precipitated silica is a form of synthetic amorphous silicon dioxide produced by precipitation from a solution containing silicate salts. It falls under HTS 2811.22.5000 as 'other' silicon dioxide, distinct from natural diatomaceous earth or fused quartz, used primarily as a reinforcing filler in rubber and tire manufacturing.
Fumed Silica (Aerosil)
Fumed silica, also known as pyrogenic silica, is an ultra-fine, non-porous silicon dioxide produced by flame hydrolysis of silicon tetrachloride. Classified under HTS 2811.22.5000 as 'other' silicon dioxide due to its synthetic chemical definition and high purity.
Colloidal Silica Dispersion (50% Solids)
Colloidal silica is a stable suspension of amorphous silicon dioxide nanoparticles in water or solvent, used for chemical mechanical polishing in semiconductors. It qualifies under HTS 2811.22.5000 as silicon dioxide in a chemically defined colloidal form.
Synthetic Amorphous Silica Gel
Synthetic amorphous silica gel is a porous form of silicon dioxide manufactured by acidifying sodium silicate, used as a desiccant. It is classified in HTS 2811.22.5000 as 'other' silicon dioxide, meeting Chapter 28 chemical definition.
High-Purity Silica Powder for LEDs
High-purity synthetic silica powder (>99.99% SiO2) used in LED phosphor production and optical applications. Falls under HTS 2811.22.5000 as other silicon dioxide, chemically defined per Chapter 28 notes.