☣️ UN 1935 • CLASS 6
Cyanide solution, n.o.s.
Placard: Toxic. 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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Quick details
UN 1935
Class: 6
Placard type: Toxic
ERG: Guide 157 (check current ERG)
Isolation: ERG 157: isolate spill 25-50m all directions; evacuate immediate area; if tank/rail car involved isolate 800m and consider evacuation 1600m downwind
Chemical & Response Details
| Also known as | Cyanide aqueous solutionHydrogen cyanide solutionAlkali cyanide solutionSodium cyanide solutionPotassium cyanide solution |
| Appearance | Clear to pale yellow liquid with a faint bitter almond odor (though many people cannot detect this odor). Aqueous solution of various cyanide salts at room temperature. |
| Flash Point | Not applicable (aqueous solution, non-flammable) |
| Boiling Point | Approximately 100C (212F), varies with concentration |
| Vapor Density | Not applicable (solution) |
| Water Reactivity | Already in aqueous solution; dilution may release hydrogen cyanide gas, especially if acidic |
| Extinguishing | Water spray, foam, CO2, dry chemical; avoid strong acids which liberate HCN gas |
| PPE | ⚠️ Level A or B with SCBA required; full chemical-resistant suit; nitrile or butyl rubber gloves; avoid all contact |
| Isolation | ERG 157: isolate spill 25-50m all directions; evacuate immediate area; if tank/rail car involved isolate 800m and consider evacuation 1600m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
- Reaction with water or moist air may release toxic, corrosive or flammable gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above
- Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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
- 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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UN 1935 — Cyanide solution, n.o.s. HAZMAT RADIO NOTE — UN 1935
Product: Cyanide solution, n.o.s.
Class 6 / Toxic / ERG 157
PPE: Level A or B with SCBA required; full chemical-resistant suit; nitrile or butyl rubber gloves; avoid all contact
ISOLATION: ERG 157: isolate spill 25-50m all directions; evacuate immediate area; if tank/rail car involved isolate 800m and consider evacuation 1600m 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 1935 — Cyanide solution, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 157
Appearance: Clear to pale yellow liquid with a faint bitter almond odor (though many people cannot detect this odor). Aqueous solution of various cyanide salts at room temperature.
Water Reactivity: Already in aqueous solution; dilution may release hydrogen cyanide gas, especially if acidic
Extinguishing: Water spray, foam, CO2, dry chemical; avoid strong acids which liberate HCN gas
PPE: Level A or B with SCBA required; full chemical-resistant suit; nitrile or butyl rubber gloves; avoid all contact
Isolation: ERG 157: isolate spill 25-50m all directions; evacuate immediate area; if tank/rail car involved isolate 800m and consider evacuation 1600m downwind
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Reaction with water or moist air may release toxic, corrosive or flammable gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the air.
— 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/1935 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1935 Cyanide solution, n.o.s. Cls6 ERG157 | allfirefighter.com/hazmat/un/1935SMS / 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/1935
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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 A or B with SCBA required; full chemical-resistant suit; nitrile or butyl rubber gloves; avoid all contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 157 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.