Horizontal Diffusion Furnace Tube
Long fused quartz tube for horizontal diffusion furnaces used in semiconductor dopant diffusion processes. Engineered for gas flow dynamics and 1200°C+ operation. Precisely matches HTS 7020.00.30.00 description for semiconductor wafer production 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 raw fused quartz cullet before tube fabrication
Unworked glass in blocks/cullet stays in 7001; processed tubes move to 7020
If designed for laboratory analytical furnaces rather than production
Lab quartzware for testing classifies in 9027, excluding semiconductor production use
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Import Tips & Compliance
• Specify horizontal furnace compatibility vs. vertical to avoid labware confusion
• Include end-flange specifications matching industry furnace standards
• Certify for POCL3, PH3 process compatibility; common CBP inquiry
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