☣️ UN 1026 • CLASS 2
UN 1026 — Cyanogen
Placard: Toxic Gas. ERG Guide 119. 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.
Cyanogen is a highly toxic gas that can cause severe skin burns and respiratory problems. It is shipped as a liquefied compressed gas and is heavier than air.
Hazard overview: Cyanogen is highly toxic and may be fatal if inhaled or absorbed through skin. It can also cause severe skin burns and respiratory problems.
Response guidance: In case of emergency, evacuate the area and call the fire department. Use CO2, dry chemical, nitrogen for extinguishing.
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UN 1026 Quick Details
UN 1026
Product name: Cyanogen
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 119 (check current ERG)
Initial isolation: ERG 119: Small spill isolate 100m all directions; large spill isolate 800m all directions, evacuate 1600m downwind during day or 2400m at night
Common Hazards of UN 1026
- TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Flammable; may be ignited by heat, sparks or flames.
- May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
Chemical Identity & Physical Properties
Cyanogen is a colorless gas with a characteristic almond-like or pungent odor.
| Also known as | DicyanogenOxalonitrileEthanedinitrileCarbon nitrideDicyan |
| CAS Number | 460-19-5 |
| Appearance | Colorless gas with a characteristic almond-like or pungent odor. Shipped as a liquefied compressed gas. Heavier than air. |
| Flash Point | Not applicable (flammable gas) |
| Boiling Point | -21C (-6F) |
| Vapor Density | 1.8 (heavier than air) |
| Water Reactivity | Hydrolyzes slowly in water forming toxic hydrogen cyanide and other products |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1026
Extinguishing Media
Do not use water directly on gas. CO2, dry chemical, nitrogen. Water spray for cooling containers only.
PPE Requirements
⚠️ Level A recommended; SCBA with full face positive pressure; chemical-resistant suit due to extreme toxicity and skin absorption hazard
Level A recommended; SCBA with full face positive pressure; chemical-resistant suit due to extreme toxicity and skin absorption hazard
Isolation & Evacuation
ERG 119: Small spill isolate 100m all directions; large spill isolate 800m all directions, evacuate 1600m downwind during day or 2400m at night
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 119).
First Actions for a UN 1026 Incident
- 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 100 meters (330 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 1026 — CyanogenHAZMAT RADIO NOTE — UN 1026
Product: Cyanogen
Class 2 / Toxic Gas / ERG 119
PPE: Level A recommended; SCBA with full face positive pressure; chemical-resistant suit due to extreme toxicity and skin absorption hazard
ISOLATION: ERG 119: Small spill isolate 100m all directions; large spill isolate 800m all directions, evacuate 1600m downwind during day or 2400m at night
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 1026 — Cyanogen
Class: 2 | Placard: Toxic Gas | ERG Guide: 119
Appearance: Colorless gas with a characteristic almond-like or pungent odor. Shipped as a liquefied compressed gas. Heavier than air.
Water Reactivity: Hydrolyzes slowly in water forming toxic hydrogen cyanide and other products
Extinguishing: Do not use water directly on gas. CO2, dry chemical, nitrogen. Water spray for cooling containers only.
PPE: Level A recommended; SCBA with full face positive pressure; chemical-resistant suit due to extreme toxicity and skin absorption hazard
Isolation: ERG 119: Small spill isolate 100m all directions; large spill isolate 800m all directions, evacuate 1600m downwind during day or 2400m at night
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
• Fire will produce irritating, corrosive and/or toxic gases.
— First Actions —
• 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 100 meters (330 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/cyanogen-un-1026 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1026 Cyanogen Cls2 ERG119 | ERG 119: Small spill isolate 100m all directions; large spill isolate 800m all d | allfirefighter.com/hazmat/un/cyanogen-un-1026SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/cyanogen-un-1026
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Frequently Asked Questions about UN 1026
No, UN 1026 Cyanogen is not flammable.
No, do not use water directly on gas.
UN 1026 Cyanogen is highly toxic and may be fatal if inhaled or absorbed through skin.
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.