Product classification
HS code for Flexible high pressure tubing: 3917.31
Plastics, tubes, pipes and hoses thereof, flexible, having a minimum burst pressure of 27.6MPa.
Classification of flexible high pressure tubing under HS 3917.31
Flexible high-pressure tubing made of plastics is classified under HS code 3917.31. This classification is found within Chapter 39, which covers plastics and articles thereof. Heading 3917 is dedicated to tubes, pipes, and hoses of plastics. The specific subheading 3917.31 is reserved for flexible tubes that have a minimum burst pressure of 27.6 MPa (approximately 4,000 psi). This technical threshold is the primary legal determinant for classification. These tubes are often reinforced with textile or metal braids to withstand extreme internal pressures while maintaining flexibility. According to the Chapter Notes for Chapter 39, "tubes, pipes and hoses" means hollow products, whether semi-manufactures or finished products, of a kind generally used for conveying, conducting or distributing gases or liquids. The high-pressure designation is critical for safety and industrial standards, and the classification reflects the specialized engineering required to meet the 27.6 MPa burst pressure requirement. If the tubing does not meet this specific pressure rating, it must be classified elsewhere within heading 3917.
- Covers
- High-pressure hydraulic plastic hoses
- Reinforced thermoplastic hoses for industrial gas
- Flexible plastic tubing with burst pressure > 27.6 MPa
- Pneumatic plastic hoses rated for high-pressure cycles
- Wire-reinforced flexible plastic pressure pipes
- Also under 3917.31
- Parker Hannifin hydraulic hoses
- Eaton Aeroquip high-pressure hoses
- Gates industrial hoses
- Continental Contitech high-pressure plastic hoses
Codes often confused with 3917.31
Common mistake. Flexible high-pressure tubing is often misclassified under 3917.39 (other flexible plastic hoses) if the burst pressure is not verified. It is also frequently confused with 4009.21 or 4009.22, which cover reinforced hoses made of vulcanized rubber. The material composition is the first check: if the hose is primarily plastic (thermoplastic), it belongs in 3917; if it is rubber, it belongs in 4009.
Top exporters and importers of HS 391731 (the code used for flexible high pressure tubing), 2025
In 2025, the largest exporter of HS 391731 (the code used for flexible high pressure tubing) in UN Comtrade data was China, with 25% of world exports; the largest importer in UN Comtrade data was the United States, with 8.0% 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 391731, not only flexible high pressure tubing.
Top exporters 2025 · share of world exports
- 1 China $401M 25% of world exports
- 2 United Kingdom $148M 9.1% of world exports
- 3 Germany $146M 9.0% of world exports
World total: $1.6B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $123M 8.0% of world imports
- 2 China $105M 6.8% of world imports
- 3 France $90M 5.8% of world imports
World total: $1.5B 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 flexible high pressure tubing
Brazil classifies flexible high pressure tubing under NCM 3917.31.00: HS 3917.31 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about flexible high pressure tubing
What is the HS code for Flexible high pressure tubing?
The HS code for Flexible high pressure tubing is 391731 (Plastics; tubes, pipes and hoses thereof, flexible, having a minimum burst pressure of 27.6MPa). The HS code for flexible plastic tubing with a minimum burst pressure of 27.6 MPa is 3917.31.
How do I classify Flexible high pressure tubing for customs?
Flexible high pressure tubing is classified under HS code 391731 — Plastics; tubes, pipes and hoses thereof, flexible, having a minimum burst pressure of 27.6MPa. This is a 6-digit subheading level code.
Does this code include hoses with permanently attached fittings?
Yes, heading 3917 includes tubes, pipes, and hoses whether or not they are fitted with their own joints or attachments, provided they retain the character of tubing.
Which countries are the top exporters of flexible high pressure tubing (HS 391731)?
In 2025, the top exporters of HS 391731 (the code used for flexible high pressure tubing) in UN Comtrade data were China ($401M, 25% of world exports), the United Kingdom ($148M) and Germany ($146M). World exports came to about $1.6B, 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 flexible high pressure tubing (HS 391731)?
In 2025, the top importers of HS 391731 (the code used for flexible high pressure tubing) in UN Comtrade data were the United States ($123M, 8.0% of world imports), China ($105M) and France ($90M). World imports came to about $1.5B, 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 Flexible high pressure tubing the same in all countries?
The base HS code 391731 for Flexible high pressure tubing 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 flexible high pressure tubing in Brazil?
In Brazil, flexible high pressure tubing (HS 391731) is classified under NCM 3917.31.00.