# United States tariff line 2528.00.00.50: Other

> In the United States tariff, line 2528.00.00.50 covers 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. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2528.00 in heading 25.28 (chapter 25).

Source: https://border.bot/countries/united-states/hs-codes/2528000050
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) / [2528.00.00.50](https://border.bot/countries/united-states/hs-codes/2528000050)

## Key facts

- Tariff line: 2528.00.00.50
- Covers: 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
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2528.00](https://border.bot/hs-codes/252800)

## What this line covers

In the United States tariff, line 2528.00.00.50 covers 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.

Its legal text is “Other”.

## How it is structured

It falls under HS subheading 2528.00 in heading 25.28 (chapter 25). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 25: Salt; sulphur; earths and stone; plastering materials, lime and cement
- Heading 25.28: 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
- Line 2528.00.00.50: Other

## Duty

Goods under this line enter free of general (MFN) duty.

The rate is published on 2528.00.00.

## 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)

## Other lines under 2528.00

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

- Previous line: [2528.00.00.10](https://border.bot/countries/united-states/hs-codes/2528000010) Natural calcium borates
- Next line: [2529.10.00.00](https://border.bot/countries/united-states/hs-codes/2529100000) Feldspar

## Frequently asked questions

### What does tariff line 2528.00.00.50 cover in the United States tariff?

In the United States tariff, line 2528.00.00.50 covers 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.

### What is the general (MFN) duty on 2528.00.00.50 in the United States?

Goods under this line enter free of general (MFN) duty. The rate is published on 2528.00.00.

## 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/2528000050.json