Float Zone Crystal Grower Heat Exchanger
Designed for float zone method crystal growers, this heat exchanger manages RF heating zone temperatures in semiconductor boule production from polysilicon feedstock. It is classified under tariff item 8402.90.00 for its role in supporting vapour generating systems.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the heat exchanger is not exclusively for boiler use
General-purpose heat exchangers fall under heading 84.19.
If presented as part of a float zone machine
Machines for semiconductor manufacture are classified in heading 84.86.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Document the heat exchanger's specific function in the float zone process to justify classification under boiler parts
• If the item is sold separately from the crystal grower, ensure the invoice clearly describes it as a part
• Check for any applicable duty deferral programs for semiconductor manufacturing equipment
Related Products under Tariff item 8402.90.00
Boiler Economizer Module
A boiler economizer module is a heat recovery module installed in boiler exhaust stacks to preheat feedwater using waste gases from steam generation. This performance-enhancing part of vapor boilers falls under tariff item 8402.90.00.
Boiler Expansion Joint
A boiler expansion joint is a flexible connection, typically bellows-type or refractory-lined slip, that accommodates thermal expansion and contraction between boiler pressure parts and structural steel during steam generation cycles. This product is a dedicated part of steam or other vapour generating boilers, falling under tariff item 8402.90.00 as a component of the boiler system.
Boiler Feedwater Pump Impeller
This specialized impeller is designed for multistage boiler feedwater pumps, delivering high-pressure water to steam boilers. While pumps themselves fall under heading 84.13, this impeller is a dedicated part of the boiler system and is classified under tariff item 8402.90.00 as a part of steam generating boilers.
Boiler Fire Tube Replacement
A replacement fire tube designed for insertion into industrial steam generating boilers to facilitate heat transfer from combustion gases to water. It falls under tariff item 8402.90.00 as a specific part of vapour generating boilers.
Boiler Firetube Replacement
A boiler firetube is a critical heat exchanger tube used in fire-tube boilers to transfer heat from combustion gases to water, generating steam. This replacement tube is a dedicated part of steam generating boilers and falls under tariff item 8402.90.00.
Boiler Handhole Door Assembly
A small access door assembly for inspecting boiler tubes through hand-sized openings in drum walls. It is classified under tariff item 8402.90.00 for water-tube boiler maintenance parts.