Borosilicate Glass Capillary Tubes
Thin-walled, unworked borosilicate capillary tubes with low expansion coefficient for chromatography, medical diagnostics, and precision instrumentation. HTS 7002.32.00.00 applies to these unprocessed tubes before drawing to final bore size.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing 24%+ lead monoxide (lead crystal)
Lead crystal capillary tubes meeting the minimum PbO content classify under the specific lead crystal subheading.
If pre-assembled into complete scientific instruments
Capillary tubes incorporated into finished analytical instruments move to Chapter 90 instruments.
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Import Tips & Compliance
• Declare exact inner/outer diameters and expansion data; customs may test samples for classification
• Store vertically in racks during shipping to prevent bending or breakage
• Avoid declaring as 'medical tubing' which could trigger device regulations under Chapter 90
Related Products under HTS 7002.32.00.00
Pyrex-Type Borosilicate Glass Rods
Unworked solid glass rods made from borosilicate with controlled low thermal expansion (≤5 x 10⁻⁶/K), ideal for stirring rods, thermometer tubes, and scientific instrument components. HTS 7002.32.00.00 covers these as unworked rods of low-expansion glass before any fabrication.
Glass Tubes for High-Temperature Manometers
Borosilicate tubing with low thermal expansion for precision pressure gauges operating at elevated temperatures. Unworked status qualifies for 7002.32.00.00 classification.
Low-Expansion Glass Rods for Laser Housings
Solid borosilicate rods for thermal mounts in high-power laser systems where dimensional stability is critical. Classifies under 7002.32.00.00 as unworked low-expansion glass rods.
Borosilicate Condensate Trap Tubes
Unworked glass tubes for cold traps in vacuum distillation systems, leveraging low expansion for thermal cycling. HTS 7002.32.00.00 for low-expansion unworked tubes.
Borosilicate Glass Laboratory Tubing
Unworked borosilicate glass tubing with a low linear coefficient of expansion (≤5 x 10⁻⁶/K from 0-300°C), used for fabricating laboratory equipment like test tubes and reaction vessels. Classified under HTS 7002.32.00.00 as unworked tubes of low-expansion glass, prior to any cutting, bending, or sealing.
Low-Expansion Glass Tubes for Vacuum Systems
Unworked glass tubes of low thermal expansion borosilicate for high-vacuum applications like vacuum manifolds and seals in scientific equipment. Falls under 7002.32.00.00 as unworked tubes meeting the precise expansion coefficient requirement.