# United States tariff line 7002.31.00.00: Of fused quartz or other fused silica

> In the United States tariff, line 7002.31.00.00 covers tubes, of fused quartz or other fused silica. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 7002.31 in heading 70.02 (chapter 70).

Source: https://border.bot/countries/united-states/hs-codes/7002310000
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 70](https://border.bot/countries/united-states/hs-codes/70) / [7002.31](https://border.bot/countries/united-states/hs-codes/700231) / [7002.31.00.00](https://border.bot/countries/united-states/hs-codes/7002310000)

## Key facts

- Tariff line: 7002.31.00.00
- Covers: Tubes, of fused quartz or other fused silica
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [7002.31](https://border.bot/hs-codes/700231)

## What this line covers

In the United States tariff, line 7002.31.00.00 covers tubes, of fused quartz or other fused silica.

Its legal text is “Of fused quartz or other fused silica”, read under “Tubes”.

## How it is structured

It falls under HS subheading 7002.31 in heading 70.02 (chapter 70). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 70: Glass and glassware
- Heading 70.02: Glass in balls (other than microspheres of heading 7018), rods or tubes, unworked
- Subheading 7002.31: Tubes
- Line 7002.31.00.00: Of fused quartz or other fused silica

## Duty

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

## In other countries

No other national tariff on border.bot has live lines under 7002.31 yet.

- [The Harmonized System text for 7002.31](https://border.bot/hs-codes/700231)

- Previous line: [7002.20.50.00](https://border.bot/countries/united-states/hs-codes/7002205000) Other
- Next line: [7002.32.00.00](https://border.bot/countries/united-states/hs-codes/7002320000) Of other glass having a linear coefficient of expansion not exceeding 5 x 10-6 per Kelvin within a temperature range of 0˚C to 300˚C

## Frequently asked questions

### What does tariff line 7002.31.00.00 cover in the United States tariff?

In the United States tariff, line 7002.31.00.00 covers tubes, of fused quartz or other fused silica.

### What is the general (MFN) duty on 7002.31.00.00 in the United States?

Goods under this line enter 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/7002310000.json