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US HTS CODE | Harmonized Tariff Schedule HS code & Tariffs Search Service (2024 HTS Revision 9)
| HTS Code | 99020132 | 99020131 |
| Article Description | Entirely spherical silicon dioxide micro-spheres, certified by the importer as having mean particle size of 3 to 18 micrometers (µm), linseed oil absorption 150 to 400 ml/g, microbial count less than 100 cfu/g, mold count less than 100 cfu/g, heavy metals less than 20 ppm, surface area 300 to 800 m²/g and pore volume of 0.8 to 2.5 ml/g (CAS No. 7631-86-9) (provided for in subheading 2811.22.10) | Amorphous silicon dioxide micro-spheres of mean particle size 0.003-0.018 mm, linseed oil absorption 30-40 ml/g, surface area less than 80 m²/g, and pore volume less than 0.1 ml/g (CAS No. 7631-86-9) (provided for in subheading 2811.22.10) |
| Quota of Quantity | -- | -- |
| Unit of Quantity | [] | [] |
| Rates of Duty (1-General) | Free | Free |
| Rates of Duty (1-Special) | No change | No change |
| Rates of Duty (2-Cuba and North Korea) | No change | No change |
| Footnotes | [stat, units], marker=1, See chapter 99 statistical note 1., type=footnote | [stat, units], marker=1, See chapter 99 statistical note 1., type=footnote |
| Additional Duty | -- | -- |
| Additional Duty(products of China) | -- | -- |