☣️ UN 2687 • CLASS 4
UN 2687 — Dicyclohexylammonium nitrite
Placard: Flammable Solid. ERG Guide 133. 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 2687 Quick Details
UN 2687
Product name: Dicyclohexylammonium nitrite
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 133 (check current ERG)
Initial isolation: ERG 133: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation for 800m in all directions; protect from heat, sparks, and open flame
Common Hazards of UN 2687
- Flammable/combustible material.
- May be ignited by friction, heat, sparks or flames.
- Some may burn rapidly with flare-burning effect.
- Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence.
- Substance may be transported in a molten form at a temperature that may be above its flash point.
- May re-ignite after fire is extinguished.
- Fire may produce irritating and/or toxic gases.
- Contact may cause burns to skin and eyes.
Chemical Identity & Physical Properties
| Also known as | DCHANDicyclohexylamine nitriteN,N-Dicyclohexylammonium nitriteDicyclohexylazanium nitrite |
| CAS Number | 3129-91-7 |
| Appearance | White to off-white crystalline solid or powder at room temperature. May have a slight amine-like odor. Hygroscopic material that may absorb moisture from air. |
| Flash Point | Not applicable (combustible solid, no liquid flash point) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but may decompose slowly releasing nitrous fumes |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2687
Extinguishing Media
Dry chemical, CO2, water spray for cooling; foam may be used for fire control
PPE Requirements
⚠️ Level B minimum during fire or spill; SCBA required in confined spaces or heavy smoke; chemical-resistant gloves and protective clothing to prevent skin contact
Isolation & Evacuation
ERG 133: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation for 800m in all directions; protect from heat, sparks, and open flame
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 133).
First Actions for a UN 2687 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.
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 2687 — Dicyclohexylammonium nitriteHAZMAT RADIO NOTE — UN 2687
Product: Dicyclohexylammonium nitrite
Class 4 / Flammable Solid / ERG 133
PPE: Level B minimum during fire or spill; SCBA required in confined spaces or heavy smoke; chemical-resistant gloves and protective clothing to prevent skin contact
ISOLATION: ERG 133: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation for 800m in all directions; protect from heat, sparks, and open flame
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 2687 — Dicyclohexylammonium nitrite
Class: 4 | Placard: Flammable Solid | ERG Guide: 133
Appearance: White to off-white crystalline solid or powder at room temperature. May have a slight amine-like odor. Hygroscopic material that may absorb moisture from air.
Water Reactivity: Soluble in water; no violent reaction but may decompose slowly releasing nitrous fumes
Extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used for fire control
PPE: Level B minimum during fire or spill; SCBA required in confined spaces or heavy smoke; chemical-resistant gloves and protective clothing to prevent skin contact
Isolation: ERG 133: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation for 800m in all directions; protect from heat, sparks, and open flame
— Key Hazards —
• Flammable/combustible material.
• May be ignited by friction, heat, sparks or flames.
• Some may burn rapidly with flare-burning effect.
— 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.
• Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/2687 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2687 Dicyclohexylammonium nitrite Cls4 ERG133 | allfirefighter.com/hazmat/un/2687SMS / 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/2687
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Frequently Asked Questions about UN 2687
Flammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare-burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished. Fire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes.
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 during fire or spill; SCBA required in confined spaces or heavy smoke; chemical-resistant gloves and protective clothing to prevent skin contact
Water reactivity: Soluble in water; no violent reaction but may decompose slowly releasing nitrous fumes. Recommended extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used for fire control.
ERG Guide 133 recommendation: ERG 133: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation for 800m in all directions; protect from heat, sparks, and open flame
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 133 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.