Product classification
HS code for Heat resistant glass tubes: 7002.32
Glass, unworked, tubes, of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6), (or 0.000005) per Kelvin within a temperature range of 0-300 degrees C.
Classification of heat resistant glass tubes under HS 7002.32
Heat resistant glass tubes are classified under HS code 7002.32. This code is designated for unworked glass tubes made of glass having a linear coefficient of expansion not exceeding 5 x 10^-6 per Kelvin within a temperature range of 0 to 300 degrees Celsius. This typically refers to borosilicate glass, known for its thermal shock resistance. Heading 7002 covers glass in balls, rods, or tubes, unworked. The classification is highly technical, relying on the physical and chemical properties of the glass rather than its intended end-use. If the glass has been further worked (e.g., graduated, bent, or processed into laboratory apparatus), it would move to a different heading. However, as raw tubing material with specific thermal resistance properties, 7002.32 is the correct designation. This classification is essential for manufacturers of laboratory equipment, industrial sight glasses, and lighting components who import raw glass stock.
- Covers
- Borosilicate glass tubing
- Neutral glass tubes for pharmaceutical use
- Pyrex-type glass tubes (unworked)
- Low-expansion glass tubes
- Raw glass tubes for laboratory glassware production
- High-temperature resistant glass rods/tubes
- Also under 7002.32
- Schott Duran
- Corning Pyrex
- Kimble Chase
- specific pharmaceutical glass tubing manufacturers (e.g., Gerresheimer)
Codes often confused with 7002.32
Common mistake. These tubes are often misclassified under 7017.20, which covers laboratory, hygienic, or pharmaceutical glassware. However, 7017 is for finished or worked glassware. If the tube is simply a length of unworked glass, it must stay in 7002. Another error is using 7002.31, which is reserved for fused quartz or other fused silica, or 7002.39 for glass with a higher expansion coefficient.
Top exporters and importers of HS 700232 (the code used for heat resistant glass tubes), 2025
In 2025, the largest exporter of HS 700232 (the code used for heat resistant glass tubes) in UN Comtrade data was the United States, with 28% of world exports; the largest importer in UN Comtrade data was China, with 20% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 700232, not only heat resistant glass tubes.
Top exporters 2025 · share of world exports
- 1 United States $17M 28% of world exports
- 2 China $15M 25% of world exports
- 3 India $14M 24% of world exports
World total: $60M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $35M 20% of world imports
- 2 Italy $29M 17% of world imports
- 3 United States $16M 9.2% of world imports
World total: $177M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for heat resistant glass tubes
Brazil classifies heat resistant glass tubes under NCM 7002.32.00: HS 7002.32 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about heat resistant glass tubes
What is the HS code for Heat resistant glass tubes?
The HS code for Heat resistant glass tubes is 700232 (Glass; unworked, tubes, of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6), (or 0.000005) per Kelvin within a temperature range of 0-300 degrees C). The HS code for unworked heat resistant glass tubes with a low expansion coefficient is 7002.32.
How do I classify Heat resistant glass tubes for customs?
Heat resistant glass tubes is classified under HS code 700232 — Glass; unworked, tubes, of glass having a linear coefficient of expansion not exceeding 5 x 10 (to the minus 6), (or 0.000005) per Kelvin within a temperature range of 0-300 degrees C. This is a 6-digit subheading level code.
What defines "heat resistant" for this HS code?
For classification in 7002.32, the glass must have a linear coefficient of expansion not exceeding 5 x 10^-6 per Kelvin between 0 and 300 degrees Celsius.
Which countries are the top exporters of heat resistant glass tubes (HS 700232)?
In 2025, the top exporters of HS 700232 (the code used for heat resistant glass tubes) in UN Comtrade data were the United States ($17M, 28% of world exports), China ($15M) and India ($14M). World exports came to about $60M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of heat resistant glass tubes (HS 700232)?
In 2025, the top importers of HS 700232 (the code used for heat resistant glass tubes) in UN Comtrade data were China ($35M, 20% of world imports), Italy ($29M) and the United States ($16M). World imports came to about $177M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Heat resistant glass tubes the same in all countries?
The base HS code 700232 for Heat resistant glass tubes is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for heat resistant glass tubes in Brazil?
In Brazil, heat resistant glass tubes (HS 700232) is classified under NCM 7002.32.00.