HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Cerium, slabs, ingots, or rods
HMT 15 June 2026- UN / ID
- UN 1333
- Hazard class
- 4.1
- Packing group
- II
- ERG guide
- ERG 170
- Special provisions
- Source
- 49 CFR §172 (15 June 2026)
Cerium, slabs, ingots, or rods
Cerium is a chemical element; it has symbol Ce and atomic number 58, and is a soft, ductile, and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide series, and while it often shows the oxidation state of +3 characteristic of the series, it also has a stable +4 state that does not oxidize water. It is considered one of the rare-earth elements. Cerium has no known biological role in humans but is not particularly toxic, except with intense or continued exposure Wikipedia
| Emergency Response Guide No. 170 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class4.1Flammable solids |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
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| IB8 | |
|---|---|
| IP2 | |
| IP4 | |
| N34 | |
| W100 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 151 | see 49 CFR §173.151 |
|---|---|---|
| (8B) Non-bulk | 212 | see 49 CFR §173.212 |
| (8C) Bulk | 240 | see 49 CFR §173.240 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 15 kg |
|---|---|
| (9B) Cargo aircraft only | 50 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
Full segregation table for class 4.1 · Browse UN entries for this class
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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3 ![]() | ||||||||||||||||||
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8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
|---|---|---|
| UN 3078 | Cerium, turnings or gritty powder | 4.3 |