MCVD Modified Chemical Vapor Deposition Preform Tube Rotator
Modified Chemical Vapor Deposition (MCVD) machine rotates fused silica tubes while injecting gaseous precursors inside, depositing layers that collapse into preforms for single-mode optical fibers. Essential for low-attenuation fiber production. HTS 8475.21.00.00 designation for optical fiber making equipment.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as finished preform tubes only
Glass preforms themselves classified in Chapter 70, not machinery.
If for semiconductor boule processing
Similar tube processing for silicon ingots in statistical notes.
If tube furnaces for laboratory glassworking
Lab-scale furnaces without deposition in Chapter 84.
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Import Tips & Compliance
• Submit process flowcharts showing internal vapor deposition and collapse cycle
• Classify complete system; tube-only imports may go to 7002.32
• Monitor for ozone-depleting gases in older MCVD variants
Related Products under HTS 8475.21.00.00
Preform Etching Station
Automated hydrofluoric acid etching station removes surface defects from optical fiber preforms, improving fiber strength. Precise chemical dosing and rinsing. HTS 8475.21.00.00 for preform processing machinery.
Optical Preform Grinder
Precision grinder shapes ends of optical fiber preforms to exact geometry for fiber drawing process, with diamond tooling for silica glass. Maintains flatness critical for draw quality. Classified HTS 8475.21.00.00.
Integrated Preform Manufacturing Line
Complete turnkey line combining VAD deposition, sintering, dehydration, and collapsing for high-volume optical fiber preform production. PLC controlled with recipe management. HTS 8475.21.00.00 for complete optical fiber making systems.
Fluorine-Doped Preform Plasma Processor
Plasma processor dopes optical fiber preforms with fluorine using downstream microwave plasma for depressed cladding index profiles in dispersion-shifted fibers. Critical for DWDM systems. Under HTS 8475.21.00.00.
Fiber Preform Dehydration Oven
Oven removes hydroxyl impurities from soot preforms using chlorine gas at elevated temperatures, essential for low-loss optical fibers. Controlled humidity environment. Specialized under HTS 8475.21.00.00.
Czochralski Crystal Puller for Optical Fiber Preforms
This machine uses the Czochralski method 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 under precise temperature control. Classified under HTS 8475.21.00.00 as it is specifically designed for producing preforms used in optical fiber manufacturing.