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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of ordinary glass without low-expansion properties
Ordinary glass tubes fall under the residual 'other glass' subheading lacking the specific thermal specification.
If processed into laboratory glassware like test tubes
Once cut, shaped, or sealed into finished lab articles, classification moves to Chapter 70 laboratory glassware.
If composed of fused quartz or fused silica
Fused silica/quartz tubes, regardless of expansion coefficient, are classified separately in the fused quartz subheading.
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Import Tips & Compliance
• Verify coefficient of expansion certification from manufacturer to confirm classification under 7002.32; test reports may be required by Customs
• Ship in protective packaging to prevent breakage; declare as unworked to avoid reclassification as finished articles
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.
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.
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.
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.