Transport reference
UN 2008 — Zirconium powder, dry
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 2008 in ADR 2025 and in 49 CFR 172.101
On the fields below the two tables agree for this number. Special provisions are deliberately absent from this comparison: identical code numbers mean different things in the two systems and are never interchangeable.
| Field | ADR 2025 Table A, Chapter 3.2 | 49 CFR 172.101 eCFR 2026-08-03 |
|---|---|---|
| Proper shipping name | ZIRCONIUM POWDER, DRY | Zirconium powder, dry |
| Class or division | 4.2 | 4.2 |
| Packing group | I, II, III | I, II, III |
| Label codes | 4.2 | 4.2 |
| Rows in the table | 3 | 3 |
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 2008 in Table A of ADR 2025
3 separate rows in Table A of Chapter 3.2. They are not interchangeable: the packing group follows from the properties of the consignment, and each row carries its own transport category — that is a different multiplier in the 1.1.3.6 calculation.
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels | Transport category | Hazard ID |
|---|---|---|---|---|---|---|
| ZIRCONIUM POWDER, DRY | 4.2 | S4 | I | 4.2 | 0 | 43 |
| ZIRCONIUM POWDER, DRY | 4.2 | S4 | II | 4.2 | 2 | 40 |
| ZIRCONIUM POWDER, DRY | 4.2 | S4 | III | 4.2 | 3 | 40 |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 4.2 is “Substances liable to spontaneous combustion” (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. |
| 2 | 333 | × 3 | Packing group II and the listed classes. |
| 3 | 1 000 | × 1 | Packing group III and the listed classes. |
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 524 | UN No. 2858 finished zirconium products of a thickness of 18 m or more are substances of Class 4.1. |
| SP 540 | UN No. 1326 hafnium powder, wetted, UN No. 1352 titanium powder, wetted or UN No. 1358 zirconium powder, wetted, with not less than 25 % water, are substances of Class 4.1. |
Source: ADR 2025, Chapter 3.3 special provisions · ECE/TRANS/352 Vol. I (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 2008 in the 49 CFR 172.101 Hazardous Materials Table
3 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) |
|---|---|---|---|---|---|---|---|
| — | Zirconium powder, dry | 4.2 | I | 4.2 | §173.None · §173.211 · §173.242 | Forbidden passenger Forbidden cargo | D · 13, 148 |
| — | Zirconium powder, dry | 4.2 | II | 4.2 | §173.None · §173.212 · §173.241 | 15 kg passenger 50 kg cargo | D · 13, 148 |
| — | Zirconium powder, dry | 4.2 | III | 4.2 | §173.None · §173.213 · §173.241 | 25 kg passenger 100 kg cargo | D · 13, 148 |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 4.2 is “Spontaneously combustible material” (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.
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.
| A19 | Combination packagings consisting of outer fiber drums or plywood drums, with inner plastic packagings, are not authorized for transportation by aircraft. |
| A20 | Plastic bags as inner receptacles of combination packagings are not authorized for transportation by aircraft. |
| B135 | For Large Packagings offered for transport by vessel, flexible or fibre inner packagings shall be hermetically sealed. |
| IB6 | Authorized IBCs: Metal (11A, 11B, 11N, 21A, 21B, 21N, 31A, 31B and 31N); Rigid plastics (11H1, 11H2, 21H1, 21H2, 31H1 and 31H2); Composite (11HZ1, 11HZ2, 21HZ1, 21HZ2 and 31HZ1). |
| IB8 | Authorized IBCs: Metal (11A, 11B, 11N, 21A, 21B, 21N, 31A, 31B and 31N); Rigid plastics (11H1, 11H2, 21H1, 21H2, 31H1 and 31H2 ); Composite (11HZ1, 11HZ2, 21HZ1, 21HZ2 and 31HZ1); Fiberboard (11G); Wooden (11C, 11D and 11F); Flexible (13H1, 13H2, 13H3, 13H4, 13H5, 13L1, 13L2, 13L3, 13L4, 13M1 or 13M2). |
| IP2 | When IBCs other than metal or rigid plastics IBCs are used, they must be offered for transportation in a closed freight container or a closed transport vehicle. |
| IP4 | Flexible, fiberboard or wooden IBCs must be sift-proof and water-resistant or be fitted with a sift-proof and water-resistant liner. |
| N34 | Aluminum construction materials are not authorized for any part of a packaging which is normally in contact with the hazardous material. |
| N5 | Glass materials of construction are not authorized for any part of a packaging which is normally in contact with the hazardous material. |
| T1 | Portable tank instruction. Minimum test pressure: 1.5 bar; minimum shell thickness (reference steel): § 178.274(d)(2); pressure-relief requirements: Normal; bottom opening requirements: § 178.275(d)(2). See 49 CFR 172.102(c)(7)(ii), Table of Portable Tank T Codes T1-T22. |
| T21 | Portable tank instruction. Minimum test pressure: 10 bar; minimum shell thickness (reference steel): 10 mm; pressure-relief requirements: Normal; bottom opening requirements: Prohibited for liquids. § 178.275(d)(2).. See 49 CFR 172.102(c)(7)(ii), Table of Portable Tank T Codes T1-T22. |
| T3 | Portable tank instruction. Minimum test pressure: 2.65 bar; minimum shell thickness (reference steel): § 178.274(d)(2); pressure-relief requirements: Normal; bottom opening requirements: § 178.275(d)(2). See 49 CFR 172.102(c)(7)(ii), Table of Portable Tank T Codes T1-T22. |
| TP33 | The portable tank instruction assigned for this substance applies for granular and powdered solids and for solids which are filled and discharged at temperatures above their melting point which are cooled and transported as a solid mass. Solid substances transported or offered for transport above their melting point are authorized for transportation in portable tanks conforming to the provisions of portable tank instruction T4 for solid substances of packing group III or T7 for solid substances of packing group II, unless a tank with more stringent requirements for minimum shell thickness, maximum allowable working pressure, pressure-relief devices or bottom outlets are assigned in which case the more stringent tank instruction and special provisions shall apply. Filling limits must be in accordance with portable tank special provision TP3. Solids meeting the definition of an elevated temperature material must be transported in accordance with the applicable requirements of this subchapter. |
| TP7 | The vapor space must be purged of air by nitrogen or other means. |
| W31 | Non-bulk packagings must be hermetically sealed. |
Source: 49 CFR 172.102 special provisions · eCFR, revision 2026-08-03
04 · Orange plate
The orange-coloured plate for UN 2008
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.
43 — spontaneously flammable (pyrophoric) solid.
| 4 | Flammability of solids or self-heating solid |
| 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 2008
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 2008 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 2008
| H250 | Catches fire spontaneously if exposed to air. |
| H260 | In contact with water releases flammable gases which may ignite spontaneously. |
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 2008 — frequently asked questions
What is UN 2008?
UN 2008 is the United Nations number for Zirconium powder, dry. Under ADR 2025 it is assigned to class 4.2 (substances liable to spontaneous combustion), classification code S4.
What packing group is UN 2008?
Table A of ADR 2025 lists UN 2008 under 3 packing groups — I, II, III — as separate rows. The packing group follows from the properties of the specific consignment; it is not interchangeable, and each row carries its own transport category.
Is UN 2008 classified the same way in the United States and in Europe?
On the fields we hold — proper shipping name, class, packing group and label codes — ADR 2025 and the 49 CFR 172.101 table agree for UN 2008. Special provisions still differ and are never interchangeable between the two systems.
What is the hazard identification number for UN 2008?
The orange-coloured plate for UN 2008 carries the hazard identification number 43 above the UN number. Under ADR 5.3.2.3.2 that number means: spontaneously flammable (pyrophoric) solid.
Which substances ship under UN 2008?
We hold 1 substance linked to UN 2008 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.