Chapter 8475 — Customs Tariff Headings

Base Attachment Machine for Lamps

An automated machine that cements or crimps lamp bases onto sealed glass envelopes containing electronic filaments. This is a final assembly step for complete electric lamps, directly matching the tariff item's scope of machines for assembling electric lamps in glass envelopes.

Electronic Tube Sealing Machine

Precision equipment that fuses glass envelopes around vacuum tube electrodes and semiconductor elements under controlled atmospheres. This is a core assembly machine for electronic tubes in glass envelopes, squarely within the tariff item's description.

Flashbulb Assembly Machine

A high-speed assembler that encapsulates flash powder and semiconductor igniters within glass envelopes to produce photographic flashbulbs. This directly matches the tariff item's coverage of machines for assembling flash-bulbs in glass envelopes.

Glass Envelope Lamp Assembler

An automated assembly line machine that seals semiconductor elements into glass envelopes to form complete electric lamps or electronic tubes. This is a direct match for the tariff item's description of machines for assembling electric lamps or tubes in glass envelopes.

Lamp Lead Wire Sealing Machine

A machine that seals lead wires through glass envelopes while maintaining vacuum integrity for electric lamps and tubes. This is a critical assembly step for glass envelope lamps, falling under the tariff item's scope of assembly machines.

LED Lamp Glass Envelope Sealer

A modern machine that hermetically seals LED chips within glass envelopes for high-reliability lamps and indicator lights. This is an assembly machine for electric lamps in glass envelopes, fitting the tariff item's description.

Tube Cathode Assembly Station

A workstation that assembles cathodes and grids inside glass envelopes before final sealing for electronic tubes. This is a stage of tube assembly in glass envelopes, covered by the tariff item's scope.

Vacuum Tube Exhaust Station

A station that evacuates air from glass envelopes and seals vacuum tubes containing electronic filaments and semiconductors. This is specialized assembly equipment for electronic tubes, matching the tariff item's description.

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.

MCVD Modified Chemical Vapor Deposition Preform Tube Rotator

A Modified Chemical Vapor Deposition (MCVD) machine that rotates fused silica tubes while injecting gaseous precursors inside, depositing layers that collapse into preforms for single-mode optical fibers. It is essential for producing low-attenuation fibers. This machine is used for making optical fibre preforms, thus classified under tariff item 8475.21.00.

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.

OVD Outside Vapor Deposition Preform Machine

An Outside Vapor Deposition (OVD) machine that flame hydrolyzes silicon tetrachloride to deposit soot on a ceramic target, building preforms for optical fibers. Multiple passes create graded index profiles. This machine is specifically used for making optical fibre preforms, thus classified under tariff item 8475.21.00.

Plasma CVD Preform Deposition Tower

A plasma-enhanced CVD tower that uses microwave plasma to deposit high-purity silica inside rotating tubes for advanced optical fiber preforms with fluorine doping capability. It produces fibers for long-haul telecom. This machine is used for making optical fibre preforms, falling under tariff item 8475.21.00.

Preform Collapsing Furnace

A high-temperature furnace that heats MCVD-deposited tubes to collapse internal layers into solid optical fiber preforms under a controlled atmosphere. It produces a symmetrical core-cladding structure. This furnace is used for making optical fibre preforms, thus classified under tariff item 8475.21.00.

Preform Etching Station

An automated hydrofluoric acid etching station that removes surface defects from optical fiber preforms, improving fiber strength. It features precise chemical dosing and rinsing. This machine is used in the manufacture of optical fibre preforms, falling under tariff item 8475.21.00.

Rod-in-Tube Optical Preform Assembler

An automated machine that inserts core rods into overclad tubes and collapses the assembly into monolithic optical fiber preforms using heat and pressure. It is used for specialty fibers. This machine is used for making optical fibre preforms, thus classified under tariff item 8475.21.00.

Silica Soot Sintering Kiln for Fiber Preforms

A specialized sintering kiln that consolidates porous silica soot preforms into dense glass rods suitable for optical fiber drawing, with precise temperature ramping to minimize defects. It is a critical post-deposition step. This kiln is used for making optical fibre preforms, falling under tariff item 8475.21.00.

VAD Chemical Vapor Deposition Preform Lathe

A lathe-based system that deposits silica soot layers via Vapor Axial Deposition (VAD) to build cylindrical optical fiber preforms, followed by sintering. It rotates the target mandrel during deposition for uniform growth. This machine is used for making optical fibre preforms, thus classified under tariff item 8475.21.00.

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.

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.

Silicon Wafer Lapper

A Silicon Wafer Lapper is a machine that laps silicon wafers to precise flatness using abrasive slurries in glass-lined polishing stations. It is involved in the hot processing of glassware for semiconductor preparation. This equipment is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.

Wafer Polishing Platform

A Wafer Polishing Platform is a rotary platform with glass carriers used for chemical-mechanical polishing of wafers to a mirror finish. It involves hot-processed glass components in its operation. This machine is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.

Wafer Slicing Diamond Saw

A Wafer Slicing Diamond Saw is a high-precision inner-diameter saw with a diamond blade for slicing thin wafers from silicon boules. It features glass coolant systems and hot-worked enclosures, qualifying it as machinery for hot working glass. This equipment is classified under tariff item 8475.29.00 as other machinery for manufacturing or hot working glass or glassware.

Anode Support Fixture for CRT Tubes

Anode support fixture designed to hold and position anodes inside glass envelopes during cathode ray tube assembly. It maintains critical spacing for electron flow, ensuring proper tube function. This fixture is a dedicated part of machines for assembling electric tubes in glass envelopes.

Base Cementing Applicator Nozzle

Precision nozzle for applying adhesive cement to attach metal bases to glass envelope lamps. It is a component of assembly machines that ensures secure, vibration-resistant bonding. This nozzle is specifically designed for lamp assembly machinery.

Crystal Boule Grinder Spindle Assembly

This rotating spindle assembly is a replacement part for crystal grinders that shape semiconductor boules to precise wafer diameters and flats. It is classified under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware, which includes equipment for preparing semiconductor wafers.

Czochralski Crystal Puller Spare Gearbox

This precision gearbox is a replacement part for Czochralski crystal pullers used in semiconductor wafer manufacturing to grow monocrystalline silicon boules. It falls under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware, which includes crystal growing equipment.

Electrode Press Assembly for Vacuum Tubes

Hydraulic press assembly for sealing electrodes into glass envelopes of vacuum tubes during assembly. It applies controlled pressure to create hermetic seals, essential for tube integrity. This is a core part of tube manufacturing machines.

Exhaust Manifold for Lamp Evacuation Systems

Multi-port manifold distributing vacuum to multiple glass envelopes in batch lamp assembly. It optimizes throughput in high-volume production by evacuating several envelopes simultaneously. This manifold is a part of evacuation machines for lamp manufacturing.

Exhaust Tube Crimping Tool Assembly

Automated crimping tool for sealing exhaust tubes on glass envelope flashbulbs after gas evacuation. It is critical for maintaining internal pressure and ensuring flashbulb reliability. This tool is a dedicated part of flashbulb assembly machines.

Flashbulb Gas Filling Injector

Injector for precise filling of flashbulb glass envelopes with high-pressure gases before sealing. It controls fill volume for consistent flash performance. This injector is a part of flashbulb assembly machines.

Flashbulb Sealing Machine Vacuum Pump

This specialized vacuum pump is designed for machines that seal flashbulbs in glass envelopes during electronic component assembly. It is classified under tariff item 8475.90.00 as a part of machines for assembling electric or electronic lamps, tubes or valves or flash-bulbs, in glass envelopes.

Float Zone Crystal Grower Heating Element

This high-temperature heating element is designed for float zone crystal growers that produce pure monocrystalline semiconductor boules from polysilicon rods. It is classified under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware, which includes crystal growing equipment.

Getter Deposition Nozzle for Lamp Envelopes

Nozzle assembly for depositing getter materials inside glass envelopes to scavenge residual gases in vacuum lamps. It ensures long-term vacuum integrity and lamp performance. This nozzle is specifically a part of lamp assembly machines.

Glass Bulb Alignment Jig

Adjustable jig for precise alignment of glass bulbs in electronic lamp assembly lines. It facilitates repeatable positioning for automated assembly. This jig is a dedicated part of machines for assembling lamps in glass envelopes.

Glass Envelope Filament Welding Arm

Robotic welding arm component for precisely attaching filaments inside glass envelopes during electric lamp assembly. It is a dedicated part of machines for assembling lamps in glass envelopes. This component ensures accurate filament placement.

Glass Envelope Lamp Assembly Conveyor Belt

This durable conveyor belt is a component for machines that assemble electric lamps in glass envelopes, facilitating automated production lines. It is classified under tariff item 8475.90.00 as a part of machines for assembling electric or electronic lamps, tubes or valves or flash-bulbs, in glass envelopes.

Hot Glassware Forming Machine Mold

This custom steel mold is used in automated machines for hot working glassware, including semiconductor quartzware production. It is classified under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware.

Lead Wire Insertion Mechanism for Lamp Tubes

Precision mechanism for inserting and positioning lead wires into glass envelopes during electronic tube assembly. It is a part of machines for assembling tubes or lamps in glass envelopes. This mechanism ensures accurate wire placement for tube functionality.

Mesa Alignment Stage for Lamp Assembly

Precision XY stage for aligning components inside glass envelope lamps during automated assembly. It provides micron-level accuracy for optical centering. This stage is a dedicated part of lamp assembly machines.

Quartz Pinch Seal Former

Heating and forming tool for creating pinch seals on quartz glass envelopes in high-intensity lamps. It handles high-melt temperatures for durable seals. This tool is a specific part of assembly machines for glass envelope lamps.

Semiconductor Wafer Grinder Control Board

This electronic control circuit board is used in wafer grinders to ensure precise dimensional control during semiconductor wafer preparation. It is classified under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware, which includes wafer processing equipment.

Stem Press Mold for Electronic Tubes

Interchangeable mold for forming glass stems with lead wires in tube assembly presses. It allows quick changeovers for different tube types. This mold is a dedicated part of glass envelope tube machines.

Tip-Off Torch Head for Flashbulb Sealing

Hydrogen-oxygen torch head for tip-off sealing of glass envelopes in flashbulb assembly machines. It provides localized melting for clean seals. This torch head is a part of hot-working equipment for lamp and flashbulb production.

Vacuum Sealing Station for Glass Envelope Lamps

Specialized vacuum sealing station used in machines that assemble electric lamps with glass envelopes. It ensures airtight seals during the manufacturing process. This station is a part of lamp assembly machines.

Wafer Lapping Machine Polishing Pad

This specialized polyurethane polishing pad is used in wafer lappers and polishers to achieve flatness tolerances required for semiconductor fabrication. It is classified under tariff item 8475.90.00 as a consumable part of machines for manufacturing or hot working glass or glassware, which includes wafer preparation equipment.

Wafer Polisher Slurry Feed Pump

This precision peristaltic pump delivers polishing slurry in wafer polishers during semiconductor surface preparation. It is classified under tariff item 8475.90.00 as a part of machines for manufacturing or hot working glass or glassware, which includes wafer processing equipment.