Crystal Boule Cooling Zone Heat Exchanger
This heat exchanger controls the cooling gradient in the post-growth zone of semiconductor crystal pullers, preventing thermal stress in silicon boules. It is classified under tariff item 8402.90.00 as a part of vapour generating boiler systems used in wafer manufacturing.
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 solely for boiler systems
Heat exchangers of general use are classified under heat exchange units, regardless of the industry.
If presented as part of a crystal pulling machine
Machines for the manufacture of semiconductor devices are classified in heading 84.86, which takes precedence over other headings.
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
• Confirm the heat exchanger is specifically designed for vapour generating systems; if it is a general-purpose heat exchanger, other headings may apply
• Keep engineering drawings showing its integration with boiler systems for CBSA review
• Check if the goods are eligible for duty relief under the Machinery Program or similar initiatives
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.