Thermometer Glass Tubing
Specialty unworked borosilicate tubing with precise bore and low thermal expansion for manufacturing mercury-free thermometers and temperature probes. These tubes meet the tariff item's coefficient of expansion requirement and are imported in raw tube form. They are classified under tariff item 7002.32.00 as unworked tubes of low-expansion glass.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
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 the tubing is imported as part of complete thermometers
Complete thermometers fall under Chapter 90.
If the tubing is worked into finished thermometer components
Worked laboratory glassware falls under heading 70.17.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the tubing is unworked and not cut to length, as cutting may reclassify it
• Provide technical data showing the expansion coefficient and bore precision
• If the tubing is for medical thermometers, check for any health product regulations
Related Products under Tariff item 7002.32.00
Borosilicate Condensate Trap Tubes
Unworked borosilicate glass tubes designed for cold traps in vacuum distillation systems. Their low linear coefficient of expansion (≤5 x 10⁻⁶/K from 0°C to 300°C) ensures resistance to thermal shock during repeated cycling. These tubes are classified under tariff item 7002.32.00 as unworked glass tubes of low-expansion glass.
Borosilicate Glass Capillary Tubes
Thin-walled, unworked borosilicate capillary tubes with a low expansion coefficient, used in chromatography, medical diagnostics, and precision instrumentation. They meet the tariff item's requirement of a linear coefficient of expansion not exceeding 5 x 10⁻⁶/K within 0°C to 300°C. These tubes are imported in their raw state before any drawing or processing.
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. The tubing is imported in long lengths without any working or finishing processes. It falls under tariff item 7002.32.00 as unworked tubes of low-expansion glass.
Borosilicate Glass Tubes for Fiber Optic Preforms
Unworked low-expansion glass tubes used as overcladding in fiber optic preform manufacturing for telecommunications cables. These borosilicate tubes have a linear coefficient of expansion not exceeding 5 x 10⁻⁶/K within 0°C to 300°C. They are imported in their raw tube form without any working or processing.
Glass Tubes for High-Temperature Manometers
Borosilicate tubing with low thermal expansion for precision pressure gauges operating at elevated temperatures. These unworked tubes are designed for high-temperature manometers and meet the tariff item's coefficient of expansion requirement. They are imported in raw tube form without any working.
Low-Expansion Glass Rods for Laser Housings
Solid borosilicate rods for thermal mounts in high-power laser systems where dimensional stability is critical. These unworked rods have a low linear coefficient of expansion (≤5 x 10⁻⁶/K) and are imported in their raw state. They fall under tariff item 7002.32.00 as unworked rods of low-expansion glass.