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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If surface-modified or treated with organosilicon compounds
Chemical modification for specific applications like anti-caking agents shifts it to 'chemical preparations' in 3824.
If natural diatomaceous earth or kieselguhr
Natural siliceous earths are classified separately in Chapter 25 as mineral products, not synthetic compounds.
If activated for use as a desiccant
Silica gel (activated silicon dioxide) for drying purposes falls under activated natural mineral products.
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Import Tips & Compliance
• Verify purity and amorphous structure via lab analysis to confirm classification as synthetic silicon dioxide under 2811, not mineral products
• Include Certificate of Analysis (COA) showing SiO2 content >99% and production method to prevent reclassification as commodity chemicals
Related Products under HTS 2811.22.50.00
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.
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.