HS Code for Silicon dioxide

Silicon dioxide, commonly known as synthetic silica, is classified under HS code 281122. This classification falls under the heading for other inorganic acids and other inorganic oxygen compounds of non-metals. Silicon dioxide in this category is typically a chemically manufactured product, distinct from naturally occurring silica. It includes various forms such as precipitated silica, silica gel, and fumed (pyrogenic) silica. These products are used in a wide range of applications, including as reinforcing fillers in tires, thickening agents in paints, and desiccant agents in packaging. The classification is determined by the chemical manufacturing process which results in a high-purity, amorphous structure. The Harmonized System distinguishes these chemical products from natural sands and minerals, which are classified based on their geological origin in Chapter 25.

Products Included

• Precipitated silicon dioxide
• Fumed silica (pyrogenic silica)
• Silica gel (without added indicators)
• Hydrated silica
• Colloidal silica in suspension

Common Misclassification

The most frequent misclassification involves natural silica sands, which are classified under HS code 250510. Natural quartz and quartzite are classified under HS code 250610. The key distinction is that 281122 is for chemically produced silica, whereas Chapter 25 covers natural minerals that have only been washed or crushed. Additionally, silica gel that has been treated with a color indicator (like cobalt chloride) for use as a desiccant is sometimes classified under 382499 as a chemical mixture, though many administrations still prefer 2811.

FAQ

What is the HS code for Silicon dioxide?

The HS code for synthetic silicon dioxide is 281122.

Is natural sand classified under the same HS code as silicon dioxide?

No, natural silica sand is classified under HS code 250510, while chemically manufactured silicon dioxide is classified under 281122.