Horizontal Diffusion Furnace Tube
A long fused quartz tube for horizontal diffusion furnaces used in semiconductor dopant diffusion processes. It is engineered for gas flow dynamics and operation at temperatures above 1200°C. The glass's low thermal expansion coefficient places it under this tariff item.
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 |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the tube does not meet the low-expansion criteria
Other glass articles fall under this residual code.
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
• Provide proof of the glass's coefficient of thermal expansion not exceeding 5x10-6 per Kelvin
• Specify the semiconductor application in the customs declaration
• Keep records of the manufacturing specifications for potential CBSA audits
Related Products under Tariff item 7020.00.10
Borosilicate Glass Inner for Thermos Vacuum Flask
A borosilicate glass inner liner designed specifically for use inside thermos vacuum flasks to hold hot or cold liquids. It fits precisely within the outer stainless steel shell, creating the vacuum insulation. This product is a glass inner for vacuum vessels, falling directly under this tariff item.
Borosilicate Inner Flask for Coffee Thermal Carafe Vacuum Vessel
A glass inner flask for electric coffee maker thermal carafes, creating vacuum insulation between glass and stainless exterior to keep coffee hot. It is precision-molded with a handle recess for vacuum vessel integration. This is a glass inner for vacuum vessels, qualifying for this tariff item.
CVD Quartz Reactor Liner
A fused silica quartz liner tube used inside chemical vapor deposition (CVD) reactors for semiconductor manufacturing. It protects the furnace chamber from corrosive process gases while maintaining optical transparency for monitoring. This article is made of glass with a very low coefficient of thermal expansion, falling under the tariff item for glassware with a linear coefficient of expansion not exceeding 5x10-6 per Kelvin.
Fused Quartz Diffusion Tube
A high-purity fused quartz tube designed for insertion into diffusion furnaces used in semiconductor wafer production. It withstands extreme temperatures and corrosive gases during the doping process. The glass has a very low coefficient of thermal expansion, qualifying for this tariff item.
Fused Silica Wafer Boat Support
A fused silica holder designed to support multiple wafer boats within oxidation furnaces for semiconductor production. It provides thermal uniformity and contamination-free handling. The material's low thermal expansion coefficient qualifies it for this tariff item.
Glass Inner Tube for Portable Vacuum Camping Mug
A thin-walled borosilicate glass inner tube for stainless steel camping vacuum mugs, enabling 24-hour hot/cold retention via vacuum insulation. It features leak-proof lid threading. This is a glass inner for vacuum vessels, falling under this tariff item.