Boule Annealing Furnace
A Boule Annealing Furnace is an industrial furnace used to anneal silicon boules inside quartz (glass) tubes, relieving internal stresses after crystal growth. It operates by heating the glass envelope to high temperatures, which qualifies as hot working of glassware. This machine is essential for improving the crystal quality of semiconductor materials.
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 furnace is used primarily for heat treatment rather than glass working
Machinery for treating materials by a temperature change process may fall under heading 84.19.
If the furnace is solely for semiconductor manufacturing and not for glass hot working
Machines for the manufacture of semiconductor devices 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
• Ensure the furnace is declared as a machine for hot working glass, not as semiconductor manufacturing equipment, to avoid misclassification
• Provide technical documentation showing the quartz tube heating function
• Check if the furnace requires any electrical safety certifications (e.g
• CSA) before importation
Related Products under Tariff item 8475.29.00
Crystal Boule Grinder
A Crystal Boule Grinder is a precision machine used to shape silicon boules to exact diameters and flats, indicating conductivity type. It often incorporates glass tooling or enclosures for thermal control during the hot processing of the material. This equipment is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.
Czochralski Crystal Puller
A Czochralski Crystal Puller is a machine that produces monocrystalline silicon boules by pulling a seed crystal from molten silicon in a crucible. It uses high-temperature glass-lined vessels for containment, which involves hot working of glass. This equipment is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.
Float Zone Crystal Grower
A Float Zone Crystal Grower uses radio frequency heating to melt a narrow zone of polycrystalline silicon rod, forming monocrystalline silicon via zone refining. The process occurs in a quartz (glass) envelope, which is hot worked during operation. This machine is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.
Glass Envelope Sealing Machine
This automated machine hermetically seals glass envelopes around semiconductor components, a process that involves hot working of glass to create a vacuum-tight package. It is classified under tariff item 8475.29.00 as it is specifically designed for manufacturing glassware used in electronic device packaging.
Quartz Crucible Hot Forming Press
This press hot-forms high-purity quartz crucibles, which are essential for Czochralski crystal pulling in semiconductor manufacturing. It directly manufactures glassware by hot working, placing it under tariff item 8475.29.00 for machines for manufacturing or hot working glass.
Quartz Wafer Boat Fabricator
This machine fabricates quartz glass wafer boats used in diffusion furnaces, involving hot glass forming to create precise holders for semiconductor wafers. It is classified under tariff item 8475.29.00 as it manufactures glassware for semiconductor processing.