Transport reference
UN 1613 — Hydrocyanic acid, aqueous solution (hydrogen cyanide, aqueous solution) with not more than 20 % hydrogen cyanide
Table A of ADR 2025 and the 49 CFR 172.101 Hazardous Materials Table for this number, kept side by side and never merged, plus the CLP label elements of the substances that ship under it.
The two tables are never merged. The same UN number can carry a different packing group, a different proper shipping name and entirely different special provisions in each system. Every value below sits under the name of the jurisdiction it comes from.
01 · Two jurisdictions
UN 1613 in ADR 2025 and in 49 CFR 172.101
The two systems differ for this number on 4 of 5 fields. Special provisions are deliberately absent from this comparison: identical code numbers mean different things in the two systems.
| Field | ADR 2025 Table A, Chapter 3.2 | 49 CFR 172.101 eCFR 2026-08-03 |
|---|---|---|
| Proper shipping name | HYDROCYANIC ACID, AQUEOUS SOLUTION (HYDROGEN CYANIDE, AQUEOUS SOLUTION) with not more than 20 % hydrogen cyanide | Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide · Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide |
| Class or division | 6.1 | 6.1 |
| Packing group | I | I, II |
| Label codes | 6.1, 3 | 6.1 |
| Rows in the table | 1 | 2 |
Sources: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE) · 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03
02 · ADR 2025
UN 1613 in Table A of ADR 2025
One row in Table A of Chapter 3.2. Every value below comes from that row.
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels | Transport category | Hazard ID |
|---|---|---|---|---|---|---|
| HYDROCYANIC ACID, AQUEOUS SOLUTION (HYDROGEN CYANIDE, AQUEOUS SOLUTION) with not more than 20 % hydrogen cyanide | 6.1 | TF1 | I | 6.1, 3 | 0 | 663 |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 6.1 is “Toxic substances” (ADR 2.1.1.1).
Transport category and the 1 000-point exemption
Column (15) of Table A decides whether a load stays under the exemption of ADR 1.1.3.6. Quantities of different categories are added with the multipliers below, and the sum must not exceed 1 000.
| Category | Max total quantity per transport unit | Multiplier in 1.1.3.6.4 | What it means |
|---|---|---|---|
| 0 | 0 | — | No quantity exemption at all: the full ADR regime applies from the first package. |
Source: ADR 2025, 1.1.3.6.3 and 1.1.3.6.4 · ECE/TRANS/352 Vol. I (UNECE). Category 0 means there is no quantity exemption at all — not that the quantity is zero.
Special provisions — ADR 2025, Chapter 3.3
Codes from column (6) of Table A, with the text of Chapter 3.3.1. These are ADR provisions only. A code with the same number exists in 49 CFR 172.102 and means something else there — the two lists are never combined.
| SP 48 | The carriage of this substance, when it contains more than 20 % hydrocyanic acid, is prohibited. |
Source: ADR 2025, Chapter 3.3 special provisions · ECE/TRANS/352 Vol. I (UNECE)
Carriage provisions — CV codes
| CV1 | Certain loading/unloading and public-place handling operations are prohibited for these goods. · relevant to segregation on the vehicle |
| CV13 | Any leaked/spilled substance must be cleaned up before the unit is reused. |
| CV28 | Must be segregated from foodstuffs, other consumables and animal feed (7.5.4). · relevant to segregation on the vehicle |
Source: ADR 2025, 7.5.11 · ECE/TRANS/352 Vol. II (UNECE)
Not imported and therefore not shown for this number: limited quantities (column 7a), excepted quantities (7b), packing instructions (8), tank codes (10–13) and the tunnel restriction code (15). An empty section is more honest than borrowed text.
03 · United States
UN 1613 in the 49 CFR 172.101 Hazardous Materials Table
2 separate rows in the Hazardous Materials Table. Where the rows differ only by the symbol in column (1), that symbol is what tells them apart — “D” is domestic-only, “I” is international.
| Symbols (1) | Proper shipping name (2) | Class (3) | PG (5) | Labels (6) | Packaging (8) | Quantity limits (9) | Vessel stowage (10) |
|---|---|---|---|---|---|---|---|
| — | Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide | 6.1 | I | 6.1 | §173.None · §173.195 · §173.244 | Forbidden passenger Forbidden cargo | D · 40 |
| D | Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide | 6.1 | II | 6.1 | §173.None · §173.195 · §173.243 | Forbidden passenger 5 L cargo | D · 40 |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 6.1 is “Poisonous materials” (49 CFR 173.2). Packaging cells are section references into 49 CFR part 173: exceptions, non-bulk, bulk. Handling codes in column 10B are defined in 49 CFR 176.84, which is not part of our import — the numbers are shown as printed in the table.
What the column (1) symbols mean
| D | Domestic only. A proper shipping name appropriate for describing materials for domestic transportation but which may be inappropriate for international transportation under IMO or ICAO provisions. |
Source: 49 CFR 172.101(b) · eCFR, revision 2026-08-03
Vessel stowage categories on this entry
| D | Must be stowed “on deck only” on a cargo vessel or on a passenger vessel within the 25-passenger limit; prohibited on a passenger vessel above that limit. |
Source: 49 CFR 172.101(k) · eCFR, revision 2026-08-03
Special provisions — 49 CFR 172.102
Codes from column (7) of the Hazardous Materials Table, with the text of § 172.102. These are United States provisions only and have nothing to do with the ADR codes above, even where the number is identical.
| 2 | This material is poisonous by inhalation (see § 171.8 of this subchapter) in Hazard Zone B (see § 173.116(a) or § 173.133(a) of this subchapter), and must be described as an inhalation hazard under the provisions of this subchapter. |
| B61 | Written procedures covering details of tank car appurtenances, dome fittings, safety devices, and marking, loading, handling, inspection, and testing practices must be approved by the Associate Administrator before any single unit tank car tank is offered for transportation. |
| B65 | Tank cars constructed before March 16, 2009, must have a test pressure of 34.47 Bar (500 psig) or greater and conform to Class 105A. Each tank car must have a reclosing pressure relief device having a start-to-discharge pressure of 15.51 Bar (225 psig). The tank car specification may be marked to indicate a test pressure of 20.68 Bar (300 psig). |
| B77 | Other packaging are authorized when approved by the Associate Administrator. |
| B82 | Cargo tanks and portable tanks are not authorized. |
| IB1 | Authorized IBCs: Metal (31A, 31B and 31N). |
| T14 | Portable tank instruction. Minimum test pressure: 6 bar; minimum shell thickness (reference steel): 6 mm; pressure-relief requirements: § 178.275(g)(3); bottom opening requirements: Prohibited. See 49 CFR 172.102(c)(7)(ii), Table of Portable Tank T Codes T1-T22. |
| T20 | Portable tank instruction. Minimum test pressure: 10 bar; minimum shell thickness (reference steel): 8 mm; pressure-relief requirements: § 178.275(g)(3); bottom opening requirements: Prohibited. See 49 CFR 172.102(c)(7)(ii), Table of Portable Tank T Codes T1-T22. |
| TP13 | Self-contained breathing apparatus must be provided when this hazardous material is transported by sea. |
| TP2 | a. The maximum degree of filling must not exceed the degree of filling determined by the following: |
| TP27 | A portable tank having a minimum test pressure of 4 bar (400 kPa) may be used provided the calculated test pressure is 4 bar or less based on the MAWP of the hazardous material, as defined in § 178.275 of this subchapter, where the test pressure is 1.5 times the MAWP. |
Source: 49 CFR 172.102 special provisions · eCFR, revision 2026-08-03
Identification number prefix on this entry: UN, NA — Appropriate for international as well as domestic transportation. Not recognized for transportation outside of the United States.
04 · Orange plate
The orange-coloured plate for UN 1613
The upper half of the plate carries the hazard identification number, the lower half the UN number. Dimensions follow ADR 5.3.2.2.1: 400 × 300 mm, black border and dividing line 15 mm, figures 100 mm high.
663 — highly toxic substance, flammable (flash-point not above 60 °C).
| 6 | Toxicity or risk of infection |
| 6 | Toxicity or risk of infection · doubled figure — intensification of that hazard |
| 3 | Flammability of liquids (vapours) and gases or self-heating liquid |
Source: ADR 2025, 5.3.2.3 · ECE/TRANS/352 Vol. II (UNECE). The tunnel restriction code of column (15) is a different value and is not part of our import.
05 · Substances
Substances shipped under UN 1613
Linked by CAS number, never by name: a name match once produced “acetone cyanohydrin” for acetone, and a wrong link here would be a wrong classification. Each entry opens its own reference page with the CLP classification and label elements.
06 · The label side
What UN 1613 looks like on a workplace label
The tables above are the transport classification. This is the other half of the same material: the CLP label elements of the substances linked to this number — what actually goes on the drum once it has been delivered. Transport marks and supply labels answer different regulations and do not replace one another.
Hazard statements on the substances under UN 1613
| H224 | Extremely flammable liquid and vapour. |
| H330 | Fatal if inhaled. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Source: harmonised classification, EU CLP Annex VI. Transport classification and supply classification are decided under different rules and do not have to agree.
07 · FAQ
UN 1613 — frequently asked questions
What is UN 1613?
UN 1613 is the United Nations number for Hydrocyanic acid, aqueous solution (hydrogen cyanide, aqueous solution) with not more than 20 % hydrogen cyanide. Under ADR 2025 it is assigned to class 6.1 (toxic substances), classification code TF1.
What packing group is UN 1613?
Under ADR 2025 UN 1613 is packing group I.
Is UN 1613 classified the same way in the United States and in Europe?
No. For UN 1613 the two tables differ on proper shipping name, packing group, label codes, rows in the table. Each panel on this page shows its own source; values from one system must not be carried over into the other.
What is the hazard identification number for UN 1613?
The orange-coloured plate for UN 1613 carries the hazard identification number 663 above the UN number. Under ADR 5.3.2.3.2 that number means: highly toxic substance, flammable (flash-point not above 60 °C).
What is the transport category of UN 1613?
Column (15) of Table A puts UN 1613 in transport category 0. Under ADR 1.1.3.6.3 the maximum total quantity per transport unit for that category is 0.
Which substances ship under UN 1613?
We hold 1 substance linked to UN 1613 by CAS number. Each one has its own reference page with the CLP classification, GHS pictograms and hazard statements that apply on the label — the workplace side of the same material.
Need the plate, the labels or the placards printed?
The orange plate above is a physical article, and so are the class labels in column (5). Our sister site GHSLabels.com covers printing and suppliers. For the workplace label of the same material, use the GHS label constructor, and browse other numbers in the UN number reference.
Reference aid only. Values are reproduced from ADR 2025 and the 49 CFR 172.101 table as published; the consignor remains responsible for the classification of a specific consignment. Always verify against the current published regulation and the supplier's safety data sheet.