# HS code 2510.10: Unground

> HS code 2510.10 covers unground. It sits in heading 25.10 (natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk) in chapter 25 (salt; sulphur; earths and stone; plastering materials, lime and cement). Other goods of heading 25.10 are classified under 2510.20 (ground). National tariff lines under 2510.10 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/251010
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 25](https://border.bot/hs-codes/25) / [25.10](https://border.bot/hs-codes/2510) / [2510.10](https://border.bot/hs-codes/251010)

## Key facts

- HS code: 2510.10
- Covers: Unground
- Heading: [25.10: Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk](https://border.bot/hs-codes/2510)
- Chapter: [25: Salt; sulphur; earths and stone; plastering materials, lime and cement](https://border.bot/hs-codes/25)
- Edition: HS2022
- Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/251010)

## What this code covers

HS code 2510.10 covers unground.

The legal text of the subheading is “Unground”, in HS2022.

## What it doesn’t cover

Other goods of heading 25.10 are classified under 2510.20 (ground).

- [2510.20](https://border.bot/hs-codes/251020) Ground

## How it is structured

2510.10 is a six-digit subheading. Its first two digits, 25, are the chapter; the first four, 2510, are heading 25.10; the last two, 10, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 25: Salt; sulphur; earths and stone; plastering materials, lime and cement
- Heading 25.10: Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk
- Subheading 2510.10: Unground

## In other countries

National tariff lines under 2510.10 are live on border.bot for the United States (1 line, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/251010): 1 line, used by 1 other country

- Previous subheading: [2509.00](https://border.bot/hs-codes/250900) Chalk
- Next subheading: [2510.20](https://border.bot/hs-codes/251020) Ground

## Frequently asked questions

### What does HS code 2510.10 cover?

HS code 2510.10 covers unground.

### Which heading and chapter is HS code 2510.10 in?

HS code 2510.10 is in heading 25.10 (natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk) in chapter 25 (salt; sulphur; earths and stone; plastering materials, lime and cement).

### Where are goods of heading 25.10 classified when 2510.10 doesn’t fit?

Other goods of heading 25.10 are classified under 2510.20 (ground).

### Which countries’ tariffs list national lines under HS code 2510.10?

National tariff lines under 2510.10 are live on border.bot for the United States (1 line, also used by 1 other country).

## Sources and updates

The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.

This page was last updated on 11 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.

Machine-readable: https://border.bot/hs-codes/251010.json