Optical Preform Grinder
A precision grinder that shapes the ends of optical fiber preforms to exact geometry for the fiber drawing process, using diamond tooling for silica glass. It maintains flatness critical for draw quality. This machine is used in the manufacture of optical fibre preforms, falling under tariff item 8475.21.00.
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 grinder is a general-purpose machine for working glass
Machine tools for working glass may be classified under heading 84.60 if not specific to preforms.
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 grinder is designed for silica glass preforms, not general grinding
• Provide specifications showing its use in optical fibre preform preparation
• Check if diamond tooling requires any special import documentation
Related Products under Tariff item 8475.21.00
Czochralski Crystal Puller for Optical Fiber Preforms
A Czochralski crystal puller specifically designed to grow high-purity silica monocrystalline boules from which optical fiber preforms are sliced. It melts silica in a crucible and slowly pulls a seed crystal to form the boule, a process essential for producing the core material of optical fibers. This machine falls under tariff item 8475.21.00 as it is used for making optical fibre preforms.
Fiber Preform Dehydration Oven
A dehydration oven that removes hydroxyl impurities from soot preforms using chlorine gas at elevated temperatures, a critical step for producing low-loss optical fibers. It operates in a controlled humidity environment to ensure the preform's purity. This machine is used in the manufacture of optical fibre preforms, thus classified under tariff item 8475.21.00.
Float Zone Optical Fiber Preform Grower
A float zone machine that uses zone melting to produce ultra-pure silica rods or boules for optical fiber preforms by floating a molten zone along a polycrystalline rod. This method achieves higher purity than Czochralski, making it suitable for low-loss optical fibers. It is a machine for making optical fibre preforms, falling under tariff item 8475.21.00.
Fluorine-Doped Preform Plasma Processor
A plasma processor that dopes optical fiber preforms with fluorine using downstream microwave plasma to create depressed cladding index profiles in dispersion-shifted fibers. This process is critical for DWDM systems in telecommunications. The machine is used specifically for making optical fibre preforms, thus classified under tariff item 8475.21.00.
High-Purity Silica Crucible Puller
A machine that pulls optical quality silica boules from high-purity quartz crucibles using precise rotation and translation for preform slicing. It uses electric heating elements to maintain a stable melt, ensuring the boule's quality. This machine is used for making optical fibre preforms, so it is classified under tariff item 8475.21.00.
Integrated Preform Manufacturing Line
A complete turnkey line that combines VAD deposition, sintering, dehydration, and collapsing for high-volume optical fiber preform production. It is PLC-controlled with recipe management for consistent output. This integrated line is used for making optical fibre preforms, falling under tariff item 8475.21.00.