HTS tariff line · chapter 25
2510.20.00
Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk: ground
Analysis
HTS 2510.20.00 covers natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk: ground under heading 2510 (natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk).
There is no general-rate duty on this line, which puts it with roughly 91% of the 78 tariff lines in chapter 25 that are also free. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
The other line in the same group is 2510.10.00 (natural calcium phosphates, natural aluminum calcium…, duty-free).
Census statistics map these goods to NAICS 21239 (Other Nonmetallic Mineral Mining and Quarrying), an industry of 236 US establishments employing 10,238 people, the industry a domestic producer of these goods reports under.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2510.10.00 | Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk: unground | Free |