☣️ UN 1194 • CLASS 3
UN 1194 — Ethyl nitrite, solution
Placard: Flammable. ERG Guide 131. 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.
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UN 1194 Quick Details
UN 1194
Product name: Ethyl nitrite, solution
DOT Class: 3
Placard type: Flammable
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: isolate spill 25-50m all directions; for large spills isolate 150m and evacuate 800m downwind if fire or significant vapor release
Common Hazards of UN 1194
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
Chemical Identity & Physical Properties
| Also known as | Ethyl nitriteNitrous etherSweet spirit of nitreEthyl ester of nitrous acid |
| CAS Number | 109-95-5 |
| Appearance | Clear to pale yellow liquid with a sweet, fruity, or ethereal odor. Highly volatile and flammable at room temperature. |
| Flash Point | -35°C (-31°F) |
| Boiling Point | 17°C (63°F) |
| Vapor Density | 2.6 (heavier than air) |
| Water Reactivity | Slightly soluble in water; no violent reaction but may decompose slowly in aqueous solutions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1194
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant gloves and suit due to toxic absorption through skin
Isolation & Evacuation
ERG 131: isolate spill 25-50m all directions; for large spills isolate 150m and evacuate 800m downwind if fire or significant vapor release
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 1194 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 for at least 50 meters (150 feet) in all directions.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1194 — Ethyl nitrite, solutionHAZMAT RADIO NOTE — UN 1194
Product: Ethyl nitrite, solution
Class 3 / Flammable / ERG 131
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to toxic absorption through skin
ISOLATION: ERG 131: isolate spill 25-50m all directions; for large spills isolate 150m and evacuate 800m downwind if fire or significant vapor release
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 1194 — Ethyl nitrite, solution
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Clear to pale yellow liquid with a sweet, fruity, or ethereal odor. Highly volatile and flammable at room temperature.
Water Reactivity: Slightly soluble in water; no violent reaction but may decompose slowly in aqueous solutions
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to toxic absorption through skin
Isolation: ERG 131: isolate spill 25-50m all directions; for large spills isolate 150m and evacuate 800m downwind if fire or significant vapor release
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— 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/1194 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1194 Ethyl nitrite, solution Cls3 ERG131 | allfirefighter.com/hazmat/un/1194SMS / 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/1194
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Frequently Asked Questions about UN 1194
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears). Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas. Runoff from fire control or dilution water may cause environmental contamination. HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air.
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; SCBA required; chemical-resistant gloves and suit due to toxic absorption through skin
Water reactivity: Slightly soluble in water; no violent reaction but may decompose slowly in aqueous solutions. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only.
ERG Guide 131 recommendation: ERG 131: isolate spill 25-50m all directions; for large spills isolate 150m and evacuate 800m downwind if fire or significant vapor release
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 131 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.