# United States tariff line 6806.90.00.20: Of molded calcium silicate

> In the United States tariff, line 6806.90.00.20 covers slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69, of molded calcium silicate. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 6806.90 in heading 68.06 (chapter 68).

Source: https://border.bot/countries/united-states/hs-codes/6806900020
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) / [6806.90](https://border.bot/countries/united-states/hs-codes/680690) / [6806.90.00.20](https://border.bot/countries/united-states/hs-codes/6806900020)

## Key facts

- Tariff line: 6806.90.00.20
- Covers: Slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69, of molded calcium silicate
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [6806.90](https://border.bot/hs-codes/680690)

## What this line covers

In the United States tariff, line 6806.90.00.20 covers slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69, of molded calcium silicate.

Its legal text is “Of molded calcium silicate”, read under “Other” and “Other”.

## How it is structured

It falls under HS subheading 6806.90 in heading 68.06 (chapter 68). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 68: Articles of stone, plaster, cement, asbestos, mica or similar materials
- Heading 68.06: Slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69
- Subheading 6806.90: Other
- Within the subheading: Other
- Line 6806.90.00.20: Of molded calcium silicate

## Duty

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

The rate is published on 6806.90.00.

## In other countries

No other national tariff on border.bot has live lines under 6806.90 yet.

- [The Harmonized System text for 6806.90](https://border.bot/hs-codes/680690)

## Other lines under 6806.90

- [6806.90.00.10](https://border.bot/countries/united-states/hs-codes/6806900010) Accoustical pads and boards
- [6806.90.00.90](https://border.bot/countries/united-states/hs-codes/6806900090) Other

- Previous line: [6806.90.00.10](https://border.bot/countries/united-states/hs-codes/6806900010) Accoustical pads and boards
- Next line: [6806.90.00.90](https://border.bot/countries/united-states/hs-codes/6806900090) Other

## Frequently asked questions

### What does tariff line 6806.90.00.20 cover in the United States tariff?

In the United States tariff, line 6806.90.00.20 covers slag wool, rock wool and similar mineral wools; exfoliated vermiculite, expanded clays, foamed slag and similar expanded mineral materials; mixtures and articles of heat-insulating, sound-insulating or sound-absorbing mineral materials, other than those of heading 6811 or 6812, or of chapter 69, of molded calcium silicate.

### What is the general (MFN) duty on 6806.90.00.20 in the United States?

Goods under this line enter free of general (MFN) duty. The rate is published on 6806.90.00.

## 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/6806900020.json