# United States tariff lines under HS 2528.00

> The United States tariff splits HS 2528.00 (natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H3BO3 calculated on the dry weight) into 3 national lines: 2528.00.00.05 (natural sodium borates and concentrates thereof (whether or not calcined)), 2528.00.00.10 (natural calcium borates) and 2528.00.00.50 (other). Every United States line under 2528.00 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/252800
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 25](https://border.bot/countries/united-states/hs-codes/25) / [2528.00](https://border.bot/countries/united-states/hs-codes/252800)

## Key facts

- HS subheading: [2528.00](https://border.bot/hs-codes/252800)
- Duty (MFN): Free
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 25: Salt; sulphur; earths and stone; plastering materials, lime and cement

## United States lines under 2528.00

The United States tariff splits HS 2528.00 (natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H3BO3 calculated on the dry weight) into 3 national lines: 2528.00.00.05 (natural sodium borates and concentrates thereof (whether or not calcined)), 2528.00.00.10 (natural calcium borates) and 2528.00.00.50 (other).

Every United States line under 2528.00 is free of general (MFN) duty.

- [2528.00.00.05](https://border.bot/countries/united-states/hs-codes/2528000005) Natural sodium borates and concentrates thereof (whether or not calcined). Duty (MFN): free
- [2528.00.00.10](https://border.bot/countries/united-states/hs-codes/2528000010) Natural calcium borates. Duty (MFN): free
- [2528.00.00.50](https://border.bot/countries/united-states/hs-codes/2528000050) Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 2528.00 yet.

- [The Harmonized System text for 2528.00](https://border.bot/hs-codes/252800)

- Previous subheading: [2526.20](https://border.bot/countries/united-states/hs-codes/252620) Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape; talc
- Next subheading: [2529.10](https://border.bot/countries/united-states/hs-codes/252910) Feldspar; leucite, nepheline and nepheline syenite; fluorspar

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2528.00?

The United States tariff splits HS 2528.00 (natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H3BO3 calculated on the dry weight) into 3 national lines: 2528.00.00.05 (natural sodium borates and concentrates thereof (whether or not calcined)), 2528.00.00.10 (natural calcium borates) and 2528.00.00.50 (other).

### What is the duty on HS 2528.00 in the United States?

Every United States line under 2528.00 is free of general (MFN) duty.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/252800.json