Mixing, kneading or stirring machines
Machines and mechanical appliances having individual functions, not specified or included elsewhere in this chapter; parts thereof: > Other machines and mechanical appliances: > Mixing, kneading, crushing, grinding, screening, sifting, homogenizing, emulsifying or stirring machines > Mixing, kneading or stirring machines
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 8479.82.00.40
Czochralski Crystal Puller
A specialized mixing and stirring machine used in semiconductor manufacturing to grow monocrystalline silicon boules via the Czochralski method, where a seed crystal is dipped into molten silicon and slowly pulled while rotating to form pure crystals. It falls under HTS 8479.82.0040 as a stirring machine for high-precision material processing in wafer production. The continuous stirring of the melt ensures uniform crystal growth essential for semiconductor wafers.
Float Zone Crystal Grower
Machine employing float zone method with mixing and stirring mechanisms to purify and grow semiconductor boules by melting a narrow zone of polycrystalline rod via RF heating while translating. Classified under HTS 8479.82.0040 for its kneading/stirring role in zone refinement for ultra-pure silicon wafers. Essential for producing defect-free crystals used in high-performance chips.
Semiconductor Wafer Slurry Mixer
High-precision mixing machine for preparing diamond or silica slurry used in wafer slicing saws, ensuring uniform abrasive particle dispersion critical for thin kerf cuts in silicon wafers. Falls under HTS 8479.82.0040 as semiconductor-specific mixing equipment per statistical notes for wafer preparation. Maintains slurry viscosity for defect-free wafer slicing from crystal boules.
Crystal Boule Melt Stirrer
Magnetic or mechanical stirrer for semiconductor melt crucibles ensuring dopant uniformity during crystal growth, preventing striations in finished silicon ingots. HTS 8479.82.0040 classification for stirring machines in wafer manufacturing equipment per statistical note (a)(i). Critical for resistivity control across wafer diameter.
Gallium Arsenide Precursor Homogenizer
Emulsifying and stirring machine for gallium arsenide compound semiconductor precursors, ensuring molecular uniformity before MOCVD reactor introduction for wafer epitaxy. Under HTS 8479.82.0040 as semiconductor processing mixing equipment per statistical notes. Prevents phase separation critical for III-V wafer quality.
Wafer Grinding Coolant Agitator
Continuous stirring machine for coolant reservoirs in wafer grinders/lappers, preventing abrasive settling during backgrinding to achieve <1 micron flatness. HTS 8479.82.0040 for semiconductor wafer preparation equipment mixing per statistical note (a)(ii)(C). Maintains suspension for TTV control.
Epitaxial Gas Premix Kneader
Kneading machine for multi-component precursor gas mixtures used in epitaxial layer growth on semiconductor wafers, ensuring stoichiometric uniformity. Classified HTS 8479.82.0040 for semiconductor processing stirring/kneading per statistical notes. Critical for compound semiconductor heterostructures.