HS code · 6-digit subheading
HS Code 2931.48 – Non-halogenated organo-phosphorous derivatives; 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide
HS code 2931.48 is the 6-digit subheading for non-halogenated organo-phosphorous derivatives, 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide. It is used for 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide, advanced flame retardant, polymer cross-linking agent, specialty catalyst and high-performance resin additive.
What HS 2931.48 covers
This HS code covers 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide, a complex non-halogenated organo-phosphorous derivative. Such compounds are typically used in highly specialized applications, often as advanced flame retardants, cross-linking agents, or catalysts in the production of high-performance polymers and resins. Their unique spiro structure can impart specific properties, making them valuable in niche markets like aerospace, automotive, and electronics where material integrity and safety are paramount. Importers are usually manufacturers of advanced materials, specialty chemical formulators, and R&D institutions. Exporters are often specialized chemical synthesis companies. The trade of such compounds requires precise chemical identification and adherence to strict quality specifications.
- Covers
- 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide
- Advanced flame retardant
- Polymer cross-linking agent
- Specialty catalyst
- High-performance resin additive
- Examples
- Dover Chemical Corporation (Additives)
- Clariant (Masterbatches)
- specialty chemical suppliers like Alfa Aesar
- custom synthesis labs
Codes often confused with 2931.48
Common mistake. Misclassification often occurs with the broader 'other' non-halogenated organo-phosphorous derivatives under 2931.49, especially if the full chemical name is not used, or with other organic compounds if the phosphorus component is not clearly identified.
Top exporters and importers of HS code 293148, 2025
In 2025, the largest exporter of HS code 293148 in UN Comtrade data was Germany, with 99% of world exports; the largest importer in UN Comtrade data was Hungary, with 31% of world imports. Austria reports $783M of its chapter 29 exports without product detail (confidential), so it may also belong among the top exporters.
Top exporters 2025 · share of world exports
- 1 Germany $578K 99% of world exports
- 2 Australia $7K 1.2% of world exports
- 3 South Africa $754 0.1% of world exports
Austria reports $783M of its chapter 29 exports without product detail (confidential), so it may also belong among the top exporters.
World total: $586K Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Hungary $213K 31% of world imports
- 2 Brazil $173K 25% of world imports
- 3 Norway $116K 17% of world imports
World total: $693K 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 2931.48
Brazil does not split HS 2931.48: its NCM code is 2931.48.00.
All Brazil NCM codes in heading 29.31 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2931.48
What is HS code 293148?
HS code 293148 is a 6-digit subheading in the Harmonized System that covers: Non-halogenated organo-phosphorous derivatives; 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide. This HS code covers 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide, a complex non-halogenated organo-phosphorous derivative. Such compounds are typically used in highly specialized applications, often as advanced flame retardants, cross-linking agents, or catalysts in the production of high-performance polymers and resins. Their unique spiro structure can impart specific properties, making them valuable in niche markets like aerospace, automotive, and electronics where material integrity and safety are paramount. Importers are usually manufacturers of advanced materials, specialty chemical formulators, and R&D institutions. Exporters are often specialized chemical synthesis companies. The trade of such compounds requires precise chemical identification and adherence to strict quality specifications.
What products fall under HS code 293148?
3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide, advanced flame retardant, polymer cross-linking agent, specialty catalyst, high-performance resin additive
What are common misclassifications for HS code 293148?
Misclassification often occurs with the broader 'other' non-halogenated organo-phosphorous derivatives under 2931.49, especially if the full chemical name is not used, or with other organic compounds if the phosphorus component is not clearly identified.
Which countries are the top exporters of goods under HS code 293148?
In 2025, the top exporters of HS code 293148 in UN Comtrade data were Germany ($578K, 99% of world exports), Australia ($7K) and South Africa ($754). World exports came to about $586K, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Austria reports $783M of its chapter 29 exports without product detail (confidential), so it may also belong among the top exporters.
Which countries are the top importers of goods under HS code 293148?
In 2025, the top importers of HS code 293148 in UN Comtrade data were Hungary ($213K, 31% of world imports), Brazil ($173K) and Norway ($116K). World imports came to about $693K, 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.
How is HS code 293148 structured?
HS code 293148 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (31) identify the heading, and digits 5-6 (48) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293148?
In Brazil, HS code 293148 is NCM 2931.48.00. The last two digits are 00 because Brazil does not split this HS code further.