☣️ UN 1463 • CLASS 5
UN 1463 — Chromium trioxide, anhydrous
Placard: Oxidizer. ERG Guide 141. 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 1463 Quick Details
UN 1463
Product name: Chromium trioxide, anhydrous
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 141 (check current ERG)
Initial isolation: ERG 141: isolate spill area 50m in all directions; if fire or large spill, isolate 800m initially and evacuate downwind
Common Hazards of UN 1463
- These substances will accelerate burning when involved in a fire.
- May explode from heat or contamination.
- Some may burn rapidly.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Toxic by ingestion.
Chemical Identity & Physical Properties
| Also known as | Chromic acid anhydrideChromium(VI) oxideChromic anhydrideChromium oxide |
| CAS Number | 1333-82-0 |
| Appearance | Dark purplish-red to brownish-red, odorless crystalline solid that is highly deliquescent (absorbs moisture from air). |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | Decomposes at 250C (482F) before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves readily in water forming chromic acid solution; reaction is exothermic and may generate heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1463
Extinguishing Media
Dry chemical, soda ash, lime; avoid organic materials and combustibles
PPE Requirements
⚠️ Level B minimum; full face SCBA required; impervious chemical protective clothing; highly toxic and corrosive
Isolation & Evacuation
ERG 141: isolate spill area 50m in all directions; if fire or large spill, isolate 800m initially and evacuate downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 141).
First Actions for a UN 1463 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 1463 — Chromium trioxide, anhydrousHAZMAT RADIO NOTE — UN 1463
Product: Chromium trioxide, anhydrous
Class 5 / Oxidizer / ERG 141
PPE: Level B minimum; full face SCBA required; impervious chemical protective clothing; highly toxic and corrosive
ISOLATION: ERG 141: isolate spill area 50m in all directions; if fire or large spill, isolate 800m initially and evacuate downwind
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 1463 — Chromium trioxide, anhydrous
Class: 5 | Placard: Oxidizer | ERG Guide: 141
Appearance: Dark purplish-red to brownish-red, odorless crystalline solid that is highly deliquescent (absorbs moisture from air).
Water Reactivity: Dissolves readily in water forming chromic acid solution; reaction is exothermic and may generate heat
Extinguishing: Dry chemical, soda ash, lime; avoid organic materials and combustibles
PPE: Level B minimum; full face SCBA required; impervious chemical protective clothing; highly toxic and corrosive
Isolation: ERG 141: isolate spill area 50m in all directions; if fire or large spill, isolate 800m initially and evacuate downwind
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some may burn rapidly.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1463 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1463 Chromium trioxide, anhydrous Cls5 ERG141 | allfirefighter.com/hazmat/un/1463SMS / 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/1463
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Frequently Asked Questions about UN 1463
These substances will accelerate burning when involved in a fire. May explode from heat or contamination. Some may burn rapidly. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Toxic by ingestion.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum; full face SCBA required; impervious chemical protective clothing; highly toxic and corrosive
Water reactivity: Dissolves readily in water forming chromic acid solution; reaction is exothermic and may generate heat. Recommended extinguishing: Dry chemical, soda ash, lime; avoid organic materials and combustibles.
ERG Guide 141 recommendation: ERG 141: isolate spill area 50m in all directions; if fire or large spill, isolate 800m initially and evacuate downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 141 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.