Vietnam chemical lookup by CAS number

Enter the CAS number of a substance to see whether it sits on the four appendices of Decree 24/2026/NĐ-CP, and what that obliges an importer to do — with the article of the Law on Chemicals 69/2025 it comes from.

  • 1,337 chemicals across 4 appendices
  • Clause-level citations to Law 69/2025
  • Storage thresholds and mixture limits

The CAS number is printed on the drum label and in section 3 of the safety data sheet.

Per-substance pages are in Vietnamese — the appendix, the threshold and the cited article are the same in both languages.

Two different questions, two different keys

This page answers

Is the substance on a Vietnamese control list?

Keyed on the CAS number, against the four appendices of Decree 24/2026/NĐ-CP.

This page does not answer

Must the shipment be declared on import?

Keyed on HS Chapters 28/29 of the finished product — the declaration duty locks to the HS code, not to the CAS numbers inside the mixture.

One “yes” does not carry the other. A substance on none of the appendices can still be declarable because of its HS code; a substance in Appendix III can fall outside the declaration duty.

Browse by appendix

Decree 24/2026/NĐ-CP · 1,337 chemicals
Appendix I39 chemicals

Basic chemicals in key chemical industries

An industrial-policy list. Appearing on it adds no condition, licence or procedure to an import at all.

No import obligation
Appendix II786 chemicals

Chemicals subject to conditional production and trading

The company must hold a Certificate of eligibility issued by the provincial People’s Committee. A condition on the establishment, not a per-consignment application.

Company-level condition
Appendix III241 chemicals

Chemicals subject to special control

Two licences are needed: a company trading licence and an export/import licence for each consignment — the latter is a condition for customs clearance.

Per-consignment licence
Appendix IV271 chemicals

Chemicals requiring an incident prevention and response plan

The duty attaches to storage and arises only above the quantity threshold printed in the appendix — it does not attach to the act of importing.

Storage-threshold based

Frequently looked up

By lookups on Avenir
Methyl benzene
CAS 108-88-3 · Appendix I, III
2 - Propanone
CAS 67-64-1 · Appendix III
Sodium hydroxide
CAS 1310-73-2 · Appendix I, II
Sulfuric acid
CAS 7664-93-9 · Appendix I, III
Hydrochloric acid
CAS 7647-01-0 · Appendix I, III, IV
Formaldehyde
CAS 50-00-0 · Appendix III, IV
Methanol
CAS 67-56-1 · Appendix I, III, IV
Chlorine
CAS 7782-50-5 · Appendix II, IV
Hydrogen peroxide
CAS 7722-84-1 · Appendix I, II
Bis (2-ethyl hexyl) phthalate (DEHP)
CAS 117-81-7 · Appendix III
n-Butanol
CAS 71-36-3 · Appendix I, II
2-Butanone
CAS 78-93-3 · Appendix I, III

Frequently asked questions

What importers ask about CAS numbers and the four appendices

Which law do these four appendices come from?
Decree 24/2026/NĐ-CP, issued under the Law on Chemicals 69/2025/QH15, which replaced Vietnam’s 2007 chemical law on 1 January 2026. The decree only issues the lists — the obligations themselves come from articles of the Law, which is why each appendix page cites a clause rather than the decree.
Does an Appendix II chemical need a licence for every shipment?
No. Appendix II requires a Certificate of eligibility to trade conditional chemicals — a condition granted once to the establishment by the provincial People’s Committee. A per-consignment licence arises only for chemicals subject to special control in Appendix III.
Does a CAS lookup tell me whether the shipment must be declared?
No — these are two separate keys. The four appendices of Decree 24/2026/NĐ-CP are keyed on the CAS number, while the import declaration duty under Article 6 of Decree 26/2026/NĐ-CP turns on HS Chapters 28 and 29. A chemical on none of the appendices can still be declarable, and the reverse also happens.
What does it mean if the CAS number is not found?
It means the substance is not on the four appendices of Decree 24/2026/NĐ-CP according to the data we hold. It can still be conditioned by other sector regulations, and the HS-code axis still has to be checked for the consignment.

Have the SDS but not the CAS numbers?

Upload the safety data sheet to our SDS reader: it extracts every ingredient, checks each CAS number against all four appendices, and states the obligations for your actual consignment weight.

Read my SDS

Checked against the gazette text on · Decree 24/2026/NĐ-CP · Law on Chemicals 69/2025

This page checks a CAS number against the four appendices of Decree 24/2026/NĐ-CP and cites the corresponding obligation from the Law on Chemicals 69/2025. General information for planning, not advice on a particular consignment.