# United States tariff lines under HS 3818.00

> The United States tariff splits HS 3818.00 (chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics) into 7 national lines: 3818.00.00.10 (gallium arsenide wafers, doped), 3818.00.00.20 (polycrystalline silicon wafers, doped), 3818.00.00.30 (silicon carbide wafers, doped), 3818.00.00.40 (round (circular) shaped, as described in statistical note 2 to this chapter) and 3 others. Every United States line under 3818.00 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/381800
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 38](https://border.bot/countries/united-states/hs-codes/38) / [3818.00](https://border.bot/countries/united-states/hs-codes/381800)

## Key facts

- HS subheading: [3818.00](https://border.bot/hs-codes/381800)
- Duty (MFN): Free
- National lines: 7
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 38: Miscellaneous chemical products

## United States lines under 3818.00

The United States tariff splits HS 3818.00 (chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics) into 7 national lines: 3818.00.00.10 (gallium arsenide wafers, doped), 3818.00.00.20 (polycrystalline silicon wafers, doped), 3818.00.00.30 (silicon carbide wafers, doped), 3818.00.00.40 (round (circular) shaped, as described in statistical note 2 to this chapter) and 3 others.

Every United States line under 3818.00 is free of general (MFN) duty.

- [3818.00.00.10](https://border.bot/countries/united-states/hs-codes/3818000010) Gallium arsenide wafers, doped. Duty (MFN): free
- [3818.00.00.20](https://border.bot/countries/united-states/hs-codes/3818000020) Polycrystalline silicon wafers, doped. Duty (MFN): free
- [3818.00.00.30](https://border.bot/countries/united-states/hs-codes/3818000030) Silicon carbide wafers, doped. Duty (MFN): free
- [3818.00.00.40](https://border.bot/countries/united-states/hs-codes/3818000040) Monocrystalline silicon wafers, doped, Round (circular) shaped, as described in statistical note 2 to this chapter. Duty (MFN): free
- [3818.00.00.45](https://border.bot/countries/united-states/hs-codes/3818000045) Monocrystalline silicon wafers, doped, Pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter. Duty (MFN): free
- [3818.00.00.50](https://border.bot/countries/united-states/hs-codes/3818000050) Monocrystalline silicon wafers, doped, Other. Duty (MFN): free
- [3818.00.00.91](https://border.bot/countries/united-states/hs-codes/3818000091) Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 3818.00 yet.

- [The Harmonized System text for 3818.00](https://border.bot/hs-codes/381800)

- Previous subheading: [3817.00](https://border.bot/countries/united-states/hs-codes/381700) Mixed alkylbenzenes and mixed alkylnaphthalenes, other than those of heading 2707 or 2902
- Next subheading: [3819.00](https://border.bot/countries/united-states/hs-codes/381900) Hydraulic brake fluids and other prepared liquids for hydraulic transmission, not containing or containing less than 70 percent by weight of petroleum oils or oils obtained from bituminous minerals

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3818.00?

The United States tariff splits HS 3818.00 (chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics) into 7 national lines: 3818.00.00.10 (gallium arsenide wafers, doped), 3818.00.00.20 (polycrystalline silicon wafers, doped), 3818.00.00.30 (silicon carbide wafers, doped), 3818.00.00.40 (round (circular) shaped, as described in statistical note 2 to this chapter) and 3 others.

### What is the duty on HS 3818.00 in the United States?

Every United States line under 3818.00 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/381800.json