Fused Silica Thermocouple Protection Tube
Unworked tube-like rod of fused silica designed to sheath thermocouples in high-temperature furnaces. Classified in HTS 7002.20.10.00 as it is an unworked rod or tube of fused silica, not further processed before annealing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made primarily from refractory materials other than fused silica
Non-glass refractory tubes shift to Chapter 69; fused quartz remains glass per chapter definition.
If of other glass types like borosilicate
Heading 7002.20 is exclusive to fused quartz/silica; other glass compositions go to 7002.39.
If sold as integral part of furnace equipment
If pre-assembled into heating apparatus, classification moves to Chapter 84 machinery parts.
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Import Tips & Compliance
• Include thermal expansion data in documentation to prove high-purity fused silica suitable for 1000°C+ applications
• Avoid declaring as 'finished tube' to prevent reclassification; specify 'unworked rod stock'
• Check for exemptions under HTSUS for scientific instrument components if end-use qualifies
Related Products under HTS 7002.20.10.00
Fused Quartz Optical Rod
A high-purity rod made from fused quartz or fused silica, unworked except for basic forming, used in optical systems and lasers. It falls under HTS 7002.20.10.00 as an unworked rod of fused quartz or other fused silica, prior to any further processing like cutting or polishing.
Fused Quartz Semiconductor Processing Rod
Cylindrical unworked rod of fused quartz used as stock material for fabricating wafer boats and diffusion tubes in semiconductor manufacturing. It qualifies for HTS 7002.20.10.00 as unworked rods of fused silica, essential for ultra-high purity environments.
Fused Silica Laboratory Stirring Rod
Straight unworked rod of fused silica used in chemical laboratories for mixing reagents without contamination. Falls under HTS 7002.20.10.00 as an unworked rod of fused quartz/silica per the tariff hierarchy for balls, rods, or tubes.
Fused Quartz Fiber Drawing Rod
Unworked fused quartz rod serving as preform material for drawing optical fibers in telecommunications. Classified under HTS 7002.20.10.00 for unworked rods of fused silica, before drawing into fibers.
High-Purity Fused Silica Halogen Lamp Rod
Unworked rod of high-purity fused silica used to fabricate envelopes for halogen cycle lamps. It is classified in HTS 7002.20.10.00 as unworked rods of fused quartz, retaining translucency for lighting applications.
Fused Quartz UV Disinfection Rod
Unworked fused quartz rod stock for manufacturing UV germicidal lamps used in water purification. Falls under HTS 7002.20.10.00 as seamed, unworked rods of fused silica with high UV transmission.