# United States tariff lines under HS 6815.91

> The United States tariff splits HS 6815.91 (other articles: Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite) into 2 national lines: 6815.91.00.11 (containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch) and 6815.91.00.71 (other). Every United States line under 6815.91 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/681591
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 68](https://border.bot/countries/united-states/hs-codes/68) / [6815.91](https://border.bot/countries/united-states/hs-codes/681591)

## Key facts

- HS subheading: [6815.91](https://border.bot/hs-codes/681591)
- Duty (MFN): Free
- National lines: 2
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 68: Articles of stone, plaster, cement, asbestos, mica or similar materials

## United States lines under 6815.91

The United States tariff splits HS 6815.91 (other articles: Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite) into 2 national lines: 6815.91.00.11 (containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch) and 6815.91.00.71 (other).

Every United States line under 6815.91 is free of general (MFN) duty.

- [6815.91.00.11](https://border.bot/countries/united-states/hs-codes/6815910011) Other articles, Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite, Containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch. Duty (MFN): free
- [6815.91.00.71](https://border.bot/countries/united-states/hs-codes/6815910071) Other articles, Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 6815.91 yet.

- [The Harmonized System text for 6815.91](https://border.bot/hs-codes/681591)

- Previous subheading: [6815.20](https://border.bot/countries/united-states/hs-codes/681520) Articles of stone or of other mineral substances (including carbon fibers, articles of carbon fibers and articles of peat), not elsewhere specified or included
- Next subheading: [6815.99](https://border.bot/countries/united-states/hs-codes/681599) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 6815.91?

The United States tariff splits HS 6815.91 (other articles: Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite) into 2 national lines: 6815.91.00.11 (containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch) and 6815.91.00.71 (other).

### What is the duty on HS 6815.91 in the United States?

Every United States line under 6815.91 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/681591.json