☣️ UN 2720 • CLASS 5
Chromium nitrate
Placard: Oxidizer. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
Quick details
UN 2720
Class: 5
Placard type: Oxidizer
ERG: Guide 141 (check current ERG)
Isolation: ERG 141: isolate spill 25-50m all directions. If fire or large spill, initial isolation 100m, protective action distance 300m downwind.
Chemical & Response Details
| Also known as | Chromic nitrateChromium(III) nitrateChromium trinitrateNitric acid chromium(III) salt |
| CAS Number | 13548-38-4 |
| Appearance | Purple to violet crystalline solid or hygroscopic crystals. May be encountered as nonahydrate form. Odorless. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Decomposes at 100-125C (212-257F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; exothermic dissolution. No violent reaction but releases heat. |
| Extinguishing | Dry chemical, CO2. Water fog may be used to cool containers but avoid direct application to material. |
| PPE | ⚠️ Level B minimum with full face respirator. SCBA if fumes present. Chemical-resistant suit for spill response. |
| Isolation | ERG 141: isolate spill 25-50m all directions. If fire or large spill, initial isolation 100m, protective action distance 300m downwind. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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).
Advertisement
📋 Copy & Share
UN 2720 — Chromium nitrate HAZMAT RADIO NOTE — UN 2720
Product: Chromium nitrate
Class 5 / Oxidizer / ERG 141
PPE: Level B minimum with full face respirator. SCBA if fumes present. Chemical-resistant suit for spill response.
ISOLATION: ERG 141: isolate spill 25-50m all directions. If fire or large spill, initial isolation 100m, protective action distance 300m 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 2720 — Chromium nitrate
Class: 5 | Placard: Oxidizer | ERG Guide: 141
Appearance: Purple to violet crystalline solid or hygroscopic crystals. May be encountered as nonahydrate form. Odorless.
Water Reactivity: Soluble in water; exothermic dissolution. No violent reaction but releases heat.
Extinguishing: Dry chemical, CO2. Water fog may be used to cool containers but avoid direct application to material.
PPE: Level B minimum with full face respirator. SCBA if fumes present. Chemical-resistant suit for spill response.
Isolation: ERG 141: isolate spill 25-50m all directions. If fire or large spill, initial isolation 100m, protective action distance 300m 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/2720 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2720 Chromium nitrate Cls5 ERG141 | ERG 141: isolate spill 25-50m all directions. If fire or large spill, initial is | allfirefighter.com/hazmat/un/2720SMS / 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/2720
Advertisement
FAQ
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 with full face respirator. SCBA if fumes present. Chemical-resistant suit for spill response.
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.