☣️ UN 1333 • CLASS 4
UN 1333 — Cerium, slabs, ingots or rods
Placard: Flammable Solid. ERG Guide 170. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 1333 Quick Details
UN 1333
Product name: Cerium, slabs, ingots or rods
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 170 (check current ERG)
Initial isolation: ERG 170: Initial isolation 50m in all directions. Protect from moisture and ignition sources.
Common Hazards of UN 1333
- May react violently or explosively on contact with water.
- Some are transported in flammable liquids.
- May be ignited by friction, heat, sparks or flames.
- Some of these materials will burn with intense heat.
- Dusts or fumes may form explosive mixtures in air.
- Containers may explode when heated.
- May re-ignite after fire is extinguished.
- Oxides from metallic fires are a severe health hazard.
Chemical Identity & Physical Properties
| Also known as | Cerium metalMetallic ceriumCerium ingotsCerium slabs |
| CAS Number | 7440-45-1 |
| Appearance | Silvery-gray to iron-gray metallic solid. Soft, malleable metal that tarnishes readily in air. Odorless. |
| Flash Point | Not applicable (pyrophoric metal) |
| Boiling Point | 3443C (6229F) |
| Vapor Density | Not applicable (solid metal) |
| Water Reactivity | Reacts with water, especially when finely divided or heated. May ignite spontaneously in moist air. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1333
Extinguishing Media
Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2.
PPE Requirements
⚠️ Level B minimum with SCBA. Heat-resistant gloves recommended. Face shield for fire conditions.
Isolation & Evacuation
ERG 170: Initial isolation 50m in all directions. Protect from moisture and ignition sources.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 170).
First Actions for a UN 1333 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 50 meters (160 feet).
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📋 Copy & Share Field Card
UN 1333 — Cerium, slabs, ingots or rodsHAZMAT RADIO NOTE — UN 1333
Product: Cerium, slabs, ingots or rods
Class 4 / Flammable Solid / ERG 170
PPE: Level B minimum with SCBA. Heat-resistant gloves recommended. Face shield for fire conditions.
ISOLATION: ERG 170: Initial isolation 50m in all directions. Protect from moisture and ignition sources.
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1333 — Cerium, slabs, ingots or rods
Class: 4 | Placard: Flammable Solid | ERG Guide: 170
Appearance: Silvery-gray to iron-gray metallic solid. Soft, malleable metal that tarnishes readily in air. Odorless.
Water Reactivity: Reacts with water, especially when finely divided or heated. May ignite spontaneously in moist air.
Extinguishing: Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2.
PPE: Level B minimum with SCBA. Heat-resistant gloves recommended. Face shield for fire conditions.
Isolation: ERG 170: Initial isolation 50m in all directions. Protect from moisture and ignition sources.
— Key Hazards —
• May react violently or explosively on contact with water.
• Some are transported in flammable liquids.
• May be ignited by friction, heat, sparks or flames.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1333 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1333 Cerium, slabs, ingots or rods Cls4 ERG170 | allfirefighter.com/hazmat/un/1333SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1333
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Frequently Asked Questions about UN 1333
May react violently or explosively on contact with water. Some are transported in flammable liquids. May be ignited by friction, heat, sparks or flames. Some of these materials will burn with intense heat. Dusts or fumes may form explosive mixtures in air. Containers may explode when heated. May re-ignite after fire is extinguished. Oxides from metallic fires are a severe health hazard.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level B minimum with SCBA. Heat-resistant gloves recommended. Face shield for fire conditions.
Water reactivity: Reacts with water, especially when finely divided or heated. May ignite spontaneously in moist air.. Recommended extinguishing: Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2..
ERG Guide 170 recommendation: ERG 170: Initial isolation 50m in all directions. Protect from moisture and ignition sources.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 170 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.