Fused Silica Glass Tubes for Semiconductor Processing
Unworked fused silica tubes designed for high-purity environments in semiconductor diffusion furnaces and wafer processing. HTS 7002.39.00 includes these as other unworked tubes, leveraging the chapter definition of fused quartz as glass. Critical for thermal stability in chip manufacturing.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If treated as refractory ceramic material
High-temp silica products sometimes misclassified under refractories if not pure glass.
If when assembled into lab processing equipment
Integrated into semiconductor lab apparatus, shifts to scientific instrument glass.
If specifically identified as fused quartz tubes
Narrower subheading applies if explicitly fused quartz rather than general other tubes.
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Import Tips & Compliance
• Provide SEMI-standard purity specs (e.g
• OH content) to validate classification and tariff treatment
• Ship in cleanroom packaging but note it's protective, not a worked coating per chapter notes
Related Products under HTS 7002.39.00
Quartz Glass Tubing for Fiber Optics
High-purity fused quartz glass tubes supplied unworked for manufacturing fiber optic cables and components. Classified in HTS 7002.39.00 as unworked tubes, including fused silica per chapter notes, prior to any drawing or fabrication. Ideal for high-temperature and optical applications.
Borosilicate Capillary Glass Tubes
Precision unworked borosilicate glass tubes with very small inner diameters for medical and analytical capillary applications. Falls under HTS 7002.39.00 as other unworked tubes, before any sealing or calibration. Used in blood analyzers, chromatography, and micro-fluidics.
Pyrex Glass Tubing for Industrial Thermowells
Pyrex-brand borosilicate unworked glass tubes for fabricating protective thermowells in industrial sensors. HTS 7002.39.00 for other unworked tubes, resistant to thermal shock for harsh environments. Used in chemical plants and refineries.
High-Purity Silica Glass Tubes for UV Lamps
Unworked high-purity synthetic silica glass tubes transmitting UV light for germicidal lamps and curing systems. HTS 7002.39.00 covers these fused silica tubes before quartz working. Essential for water purification and sterilization equipment.
Square Borosilicate Glass Tubing
Unworked square-profile borosilicate glass tubes for architectural models and specialty furniture. Classified HTS 7002.39.00 as other unworked tube shapes beyond round. Provides structural glass elements without fabrication.
Thin-Wall Borosilicate Glass Tubing for Vaporizers
Ultra-thin wall unworked borosilicate tubes for high-end electronic cigarette tanks and vaporizer chambers. HTS 7002.39.00 for other precision tubes before tank assembly. Heat-resistant for vaping applications.