Heading 3818

Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics

7 declarable lines

Heading 3818 covers doped chemical elements and doped chemical compounds for electronics when put up as discs, wafers or similar forms. The lines split first by material and then, for monocrystalline silicon, by wafer shape. The general (MFN) rate is Free for all listed lines.

Products in this heading

Doped gallium arsenide wafers
Doped polycrystalline silicon wafers
Doped silicon carbide wafers
Round doped monocrystalline silicon wafers
Pseudo-square doped monocrystalline silicon wafers
Rectangular doped monocrystalline silicon wafers
Other doped element or compound wafers

How to choose the right subheading

Confirm the item is a doped chemical element or doped chemical compound for electronics.
Identify the material: gallium arsenide, polycrystalline silicon, silicon carbide, monocrystalline silicon, or other.
For monocrystalline silicon, check whether the wafer is round, pseudo-square or rectangular, or other shape.
Confirm the form is a disc, wafer or similar form rather than a finished device.

Often confused with

Undoped silicon wafers
Doping is absent, so heading 3818 does not apply.
Heading 2804
Finished integrated circuits cut from wafers
Heading 3818 covers doped wafer stock, not completed chips.
Heading 8542
Solar cells made from doped wafers
The cell is a semiconductor device, not a doped wafer.
Heading 8541
Semiconductor manufacturing equipment
Machines for making wafers or chips are not doped wafer materials.
Heading 8486

Frequently asked questions

What is the HTS code for doped gallium arsenide wafers?

Use 3818.00.00.10. The general (MFN) rate is Free.

What is the duty on doped silicon carbide wafers?

The listed line is 3818.00.00.30, and its general (MFN) rate is Free.

How do I classify doped monocrystalline silicon wafers?

Classify by shape: round wafers fall under 3818.00.00.40 with a general (MFN) rate of Free, and pseudo-square or rectangular wafers fall under 3818.00.00.45 with a general (MFN) rate of Free.

Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.