Czochralski Crystal Puller Work Roll
A cast steel work roll used in the Czochralski method crystal pullers for producing monocrystalline silicon boules from which semiconductor wafers are sliced. It falls under HTS 8455.30.0035 as a cast steel roll for rolling mills, weighing not over 2,268 kg, specifically adapted for precise material processing in semiconductor boule formation. The roll's surface ensures uniform pulling and minimal contamination during crystal growth.
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 unfinished or machined parts not specifically rolls
Unfinished metal parts for machinery may shift to Chapter 84 heading for machinery parts if not identifiable as rolling mill rolls.
If for industrial testing machines without rolling function
If primarily for semiconductor testing rather than material processing, it falls under Chapter 90 for measuring instruments.
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Import Tips & Compliance
• Verify roll weight does not exceed 2,268 kg and confirm cast steel composition via mill certificates to avoid reclassification
• Provide detailed engineering specs showing semiconductor end-use for potential duty relief under specialized programs
• Ensure rolls are free of contaminants; common pitfall is improper cleaning documentation leading to rejection
Related Products under HTS 8455.30.00.35
Float Zone Crystal Grower Backup Roll
Cast steel backup roll for float zone crystal growers used to produce high-purity silicon ingots for semiconductor wafers. Classified under HTS 8455.30.0035 due to its role in supporting material flow in rolling mill-like processes for monocrystalline semiconductor production, with weight under 2,268 kg. Ensures stability during zone refining without introducing impurities.
Semiconductor Wafer boule Grinder Roll
Precision cast steel roll for crystal grinders that shape semiconductor boules to exact diameters for wafer production. Under HTS 8455.30.0035 as a cast steel rolling mill roll not exceeding 2,268 kg, critical for grinding flats indicating conductivity type. Maintains tight tolerances essential for downstream wafer slicing.
Gallium Arsenide Crystal Puller Guide Roll
Cast steel guide roll for pullers processing gallium arsenide boules for compound semiconductor wafers, weighing under 2,268 kg. HTS 8455.30.0035 applies as rolls for rolling mills in specialized material processing. Provides precise guidance to prevent boule defects during growth.
Silicon Wafer Slicing Saw Support Roll
Cast steel support roll for wafer slicing saws that cut monocrystalline boules into thin semiconductor wafers. Classified in HTS 8455.30.0035 for cast steel rolling mill rolls ≤2,268 kg, stabilizing the boule during high-precision slicing operations. Ensures flatness and minimal kerf loss.
Crystal Boule Diameter Grinding Roll
Heavy-duty cast steel roll for grinding semiconductor crystal boules to precise diameters prior to wafering, under 2,268 kg. HTS 8455.30.0035 covers this as cast steel rolls for mills in semiconductor material preparation. Achieves tolerances critical for wafer uniformity.
Monocrystalline Silicon Flat Grinding Roll
Specialized cast steel roll for grinding orientation flats on silicon boules to denote resistivity and type. Falls under HTS 8455.30.0035 as ≤2,268 kg cast steel rolling mill rolls for semiconductor boule prep. Ensures accurate conductivity indication for wafer fabrication.